SWIR Camera Lens for Pharmaceutical Blister Pack Inspection: Tablet Presence, Packaging Transmission and Hidden Product Verification

Pharmaceutical blister-pack inspection becomes challenging when the product must be verified after it has entered a formed cavity, when the covering material reduces visible contrast, or when the defect involves presence, breakage, wrong product, partial fill, cavity contamination or hidden material rather than a simple printed-packaging error. A conventional visible image can be highly effective when the tablet, capsule and packaging remain clearly exposed, but once the product is viewed through selected polymer layers or visually confusing package structures, appearance alone may no longer provide enough information for reliable automated verification. 900–1700 nm SWIR imaging for pharmaceutical blister-pack inspection can offer an additional material-sensitive view because some package materials, pharmaceutical products and contaminants interact differently with short-wave infrared radiation than they do with visible light. When sufficient SWIR transmission exists through the relevant packaging layer, the system can potentially inspect whether a cavity contains the expected product, whether material is missing or broken, whether the cavity response differs from normal, and whether the package stack allows reliable hidden-product verification.

The optical design must be treated as a complete system rather than assuming that a SWIR camera can simply see through any blister pack. Packaging transmission, cavity geometry, foil or backing structure, tablet composition, illumination direction, focal length, field of view, working distance and minimum defect size all affect whether useful contrast reaches the sensor. The dedicated Kyptec Automation® SWIR Camera Lens collection currently includes 8.5 mm, 12.5 mm, 25 mm, 35 mm and 50 mm focal lengths for 900–1700 nm imaging. Verified Kyptec Automation® product pages specify the current range around 2 MP resolution, 2/3-inch sensor format, F1.4 aperture and C-Mount, while pharmaceutical inspection is among the industrial application areas identified for the SWIR lens family.

Pharmaceutical Blister Inspection Is a Packaging-Stack Problem, Not Only a Tablet-Detection Problem

A blister pack is an optical stack containing multiple materials and interfaces. Depending on the construction, SWIR radiation may first pass through a polymer forming web, interact with the tablet or capsule, reflect from or be blocked by a backing layer, and return through the same cover before reaching the camera. Each layer has its own wavelength-dependent transmission, absorption and reflection behaviour. Therefore, a strong pharmaceutical SWIR inspection design should begin by analyzing the complete package rather than imaging the tablet separately and assuming the same contrast will remain after sealing.

This distinction is critical because a product can be highly distinguishable in open air yet become difficult to detect through the final package. Conversely, selected packaging materials that appear opaque or visually distracting can sometimes become less dominant in parts of the SWIR spectrum, allowing stronger relative contrast from the product underneath. The only reliable way to establish feasibility is to test the actual pharmaceutical product inside the actual production blister structure.

Hidden Product Verification Requires Sufficient Packaging Transmission

The first engineering question should be whether enough SWIR energy can reach the product and return to the camera. A packaging layer that absorbs strongly throughout the selected spectral region can prevent hidden inspection regardless of camera sensitivity or lens quality. If the material has useful transmission at one or more wavelengths, however, the underlying tablet or capsule may contribute enough signal for classification.

The machine builder should therefore measure or experimentally compare the package response at several wavelengths between 900 and 1700 nm. The objective is not to maximize raw transmission alone. A wavelength is valuable when it creates the largest stable difference among empty cavity, correct product, defective product and other critical states. High package transmission with almost no product contrast may be less useful than moderate transmission at a wavelength where the tablet response is strongly different from the cavity background.

Empty-Cavity Detection Is One of the Most Direct SWIR Blister Inspection Tasks

A missing tablet or capsule creates a large material difference because the cavity contains air or packaging structure instead of the expected pharmaceutical product. If the package layer transmits enough SWIR radiation, the empty cavity can produce a substantially different intensity or spectral response from an occupied cavity.

The inspection algorithm can define an expected region of interest inside each blister pocket and calculate statistics such as mean intensity, median response, spatial texture or multi-wavelength ratios. A cavity whose measured feature falls outside the validated occupied-product population can be classified as empty or uncertain. The system should be trained on real empty cavities because the formed blister itself can generate reflections and geometry-dependent signal that differ across the pocket.

Tablet Presence Is Different From Correct-Tablet Verification

Detecting that something exists inside a cavity is easier than verifying that it is the correct pharmaceutical product. An occupied cavity may contain the wrong tablet, a fragment, two tablets, a foreign material or a product with unusual composition. Therefore, the required inspection objective should be defined carefully.

A simple presence check may only need strong contrast between empty and occupied pockets. Correct-product verification requires a more discriminating feature based on material response, size, shape or a combination of these. SWIR can be especially valuable when two products have similar visible colour but different short-wave infrared behaviour. The machine should still avoid claiming exact chemical identity unless the spectral and validation data support that level of classification.

Broken Tablets Need Both Spectral and Spatial Information

A broken pharmaceutical tablet may still produce a similar average material response to a complete tablet because the chemical composition is unchanged. The defect becomes primarily geometric. The system must therefore preserve enough spatial resolution to recognize missing area, irregular outline or separated fragments.

This means field of view and pixels per cavity are important. If each tablet occupies only a small number of pixels, a fragment can be averaged together with cavity background and become difficult to distinguish. A good SWIR blister inspection system should therefore allocate enough sensor resolution to each cavity that both material-sensitive contrast and physical product geometry remain useful.

Partial Product and Fragment Detection Should Be Validated Near the Minimum Reject Size

A severely broken tablet is normally easy to classify. The difficult cases are small chips, partial fragments or product loss close to the acceptable limit. Those samples should dominate development and qualification.

If the smallest rejectable missing region is 1.5 mm across, the lens and field of view should provide enough object-side sampling for that region to remain distinct after optical blur, package scattering and motion are considered. Designing only around complete-tablet presence can produce a machine that passes early demonstrations but fails on the defects that matter commercially.

The Blister Cavity Itself Can Produce Strong Optical Variation

Formed blister pockets contain curved surfaces. These can refract and reflect SWIR illumination differently depending on position, cavity depth, viewing angle and product placement. A correct tablet near the edge of the pocket may therefore generate a different image from the same tablet centered inside the cavity even though product quality is identical.

A robust system should either stabilize product position sufficiently or train and validate across the permitted cavity distribution. Regions affected by strong edge reflection may need separate processing from the central tablet area. The lens should also be positioned so that the expected cavity field remains within a geometrically stable imaging region.

Wide Blister Webs Require Enough Resolution Per Pocket

Where several blister cavities or a full blister card must be inspected in one image, the Kyptec Automation® KL-1408 8.5 MM SWIR Camera Lens can be evaluated for broad coverage. The live product page specifies 8.5 mm focal length, 900–1700 nm wavelength range, 2 MP resolution, F1.4 aperture, 2/3-inch sensor format and C-Mount.

The wide FOV can be useful for multi-pocket inspection, but the relevant calculation is not only card width. The OEM should determine how many pixels fall across each tablet, each cavity and the smallest fragment or missing region. If full-card coverage leaves insufficient pixels per pocket, using a narrower field or multiple inspection stations may provide stronger reliability.

Packaging Film Thickness Can Change Hidden-Product Contrast

Even when the same polymer material is used, variation in film thickness can alter SWIR transmission. A thicker region may attenuate more radiation than a thinner region, potentially shifting the measured tablet intensity. If the classifier is trained only on one ideal package thickness, legitimate manufacturing variation could create false rejects.

The production validation set should therefore include realistic blister-film thickness tolerances. If the package contribution changes significantly, the algorithm may require local normalization or a wavelength combination that is less sensitive to the film while remaining sensitive to the pharmaceutical product.

Printed Areas and Labels Should Be Kept Out of Critical Measurement Regions Where Possible

Printed packaging features can introduce additional absorption or reflectance. Even though the system operates outside the visible spectrum, inks and pigments may still affect SWIR response. If a printed code overlaps the inspection region, the measured signal can shift according to print density or registration.

A better optical and packaging arrangement positions the material-verification region away from unnecessary printed graphics where possible. If print must overlap the cavity, the actual production graphics should be included in qualification rather than testing only clear unprinted blister samples.

Foil-Backed Blisters Can Limit Through-Transmission Inspection

A highly reflective or opaque backing layer can prevent straightforward transmission imaging through the complete package. In that case, a one-sided reflection architecture may be more realistic if the forming web allows useful SWIR access to the product from the transparent side.

The precise capability depends on the package construction. SWIR should not be described as universally capable of seeing through foil or metal barriers. If the backing layer blocks the relevant radiation completely, the inspection must rely on information accessible from the available side of the blister or be positioned before final sealing.

Pre-Seal and Post-Seal SWIR Inspection Answer Different Questions

A pre-seal station can inspect tablet presence, product geometry, fragments and cavity contamination while the pockets remain open. This generally provides easier optical access but cannot verify the final sealed package condition. A post-seal station can confirm product presence after closure and may detect certain hidden abnormalities, but the package layers become part of the measurement and can reduce available contrast.

The strongest pharmaceutical machine architecture may therefore use SWIR at the stage where it adds the most value rather than insisting that every inspection happen after sealing. Process design should reflect whether the primary risk is missing product, wrong material, breakage, packaging interference or final-pack verification.

Multi-Wavelength Inspection Can Improve Correct-Product Classification

A single SWIR wavelength may clearly separate empty from occupied cavities but provide limited discrimination between two visually similar tablet formulations. If the products have different relative spectral responses, two or more wavelengths may create a stronger material feature.

A normalized ratio such as R = I₁/I₂ can sometimes reduce common brightness effects caused by package thickness or illumination while emphasizing material differences. Multi-wavelength systems should still be kept as simple as possible. Additional bands are justified only when they improve separation of the hardest product pair or reduce false decisions caused by packaging variability.

Spatial Registration Becomes Critical in Multi-Band Blister Inspection

If different wavelengths are captured sequentially while the blister web is moving, the same pixel coordinate may no longer correspond to the same part of the tablet. This can corrupt wavelength ratios, especially near tablet edges or broken regions.

The system should therefore synchronize illumination and image acquisition tightly enough that inter-band displacement remains small relative to the minimum feature. Alternatively, registration algorithms can align the spectral images before material calculations are performed. Multi-band classification is strongest when every wavelength observes the same physical region.

The Kyptec Automation® KL-1410 Can Balance Full-Pack Coverage and Per-Cavity Detail

For blister layouts where the 8.5 mm field is wider than necessary, the Kyptec Automation® KL-1410 12.5 MM SWIR Camera Lens can provide a useful balance between package coverage and cavity-level resolution. The verified product page identifies the Kyptec Automation® KL-1410 with 12.5 mm focal length, 900–1700 nm operation, 2 MP resolution, F1.4 aperture, 2/3-inch sensor format and C-Mount.

This type of intermediate FOV can be valuable when multiple pockets still need to fit into one frame but each product requires enough pixels for shape, presence and material-response analysis.

A 25 mm SWIR Lens Can Support Product-Focused Blister Inspection

When one cavity or a small number of cavities must be analyzed with stronger spatial detail, the Kyptec Automation® KL-1412 25 MM SWIR Camera Lens can be evaluated. Its current live specifications confirm 25 mm focal length, 900–1700 nm range, 2 MP resolution, F1.4, 2/3-inch format and C-Mount.

Tighter framing can increase the number of sensor pixels representing the pharmaceutical product, helping distinguish fragments, shape anomalies and localized spectral irregularities. The trade-off is reduced package coverage, so the optimum focal length depends on whether throughput or per-pocket detail is the dominant requirement.

Capsule Inspection Can Be More Complex Than Tablet Inspection

Capsules introduce additional layers because the shell itself has material properties and may transmit or absorb differently across SWIR wavelengths. The camera may therefore record a combination of shell, fill material and cavity response. This can be useful if the goal is verifying capsule presence or identifying gross fill differences, but it complicates interpretation if the system attempts to infer internal composition.

The complete capsule—shell plus fill—should therefore be treated as the production object. Reference samples should include normal shell colour, thickness and orientation variation so the classifier does not incorrectly treat legitimate capsule differences as product defects.

Tablet Orientation Should Be Included in Qualification

Round tablets may generate relatively stable geometry, while oblong, scored, embossed or irregular tablets can look different depending on orientation inside the blister. Embossing and score lines can also create local intensity changes that resemble defects.

The inspection model should therefore include the range of orientations permitted by the packaging process. If orientation is mechanically controlled, the fixture tolerance should be documented. If random, the training and validation population must represent that variation adequately.

Cavity Contamination Can Mimic Product Fragments

Dust, powder residue, broken-tablet particles or foreign material inside an empty cavity can increase the SWIR response and potentially make the pocket appear occupied. A presence classifier should therefore not rely solely on average cavity brightness.

Spatial structure, object area and spectral characteristics can help distinguish a complete tablet from scattered residue. The minimum contamination level that matters should be tested independently because a system optimized only for missing tablets may misclassify unusual cavity contamination.

Double-Product or Overfill Inspection Requires Geometry as Well as Material Signal

If two tablets enter one cavity, the total SWIR material signal may increase, but the exact response can depend on overlap and package geometry. Spatial analysis of occupied area, shape and thickness-related intensity can provide stronger evidence than mean signal alone.

The classifier should therefore use the expected geometric envelope of the correct product. A cavity with excessive occupied area or an abnormal internal contour can be flagged even when the material identity appears correct.

Reflection From Curved Blister Surfaces Can Create False Bright Spots

Glossy formed plastic can produce specular reflections that change with package tilt. These reflections may saturate local pixels and hide the tablet beneath them. The optical system should therefore control illumination angle, camera angle and pack orientation carefully.

Where the package geometry permits, diffuse or appropriately positioned SWIR illumination can reduce direct reflection into the lens. The final design should be validated with the full range of blister curvature and machine vibration rather than only flat reference samples.

Exposure Must Preserve Both Packaging and Product Information

If exposure is set too high, strongly reflecting package regions can saturate and destroy useful signal. If exposure is too low, the tablet or capsule may fall near the noise floor after SWIR transmission losses through the packaging. The correct exposure should therefore preserve dynamic range across both the brightest package structure and the darkest valid product.

The F1.4 maximum aperture available across the current Kyptec Automation® SWIR portfolio provides useful optical throughput for applications where packaging reduces the available signal. The final production aperture should still be chosen according to depth of field, glare, exposure and cavity-height variation rather than maximum brightness alone.

Blister Height Variation Can Affect Focus

Formed pockets position the pharmaceutical product at different depths relative to the package surface. If cavity depth varies across formats, the required focus plane can change. A narrow depth of field may produce sharp images in one blister design and softer product detail in another.

The lens aperture, working distance and focus should therefore be qualified using the tallest and deepest blister geometries expected in production. If several pack formats share one machine, separate optical recipes may be appropriate.

Long Focal Lengths Can Support Tight Cavity Inspection From Greater Stand-Off

Mechanical clearance around pharmaceutical packaging lines can be limited by sealing tools, guides, lighting structures or guarding. The Kyptec Automation® KL-1414 35 MM SWIR Camera Lens and Kyptec Automation® KL-1416 50 MM SWIR Camera Lens provide narrower focal-length options within the same current SWIR range. Their verified product pages specify 900–1700 nm, 2 MP, 2/3-inch format, F1.4 and C-Mount.

These focal lengths can be useful where a small inspection area must be viewed from a longer working distance. Their value comes from geometry and sensor utilization, not from an assumption that longer focal length automatically improves material discrimination.

Reject Logic Should Be Built Around Pharmaceutical Risk

Not every abnormal pixel should trigger the same production action. Missing product, wrong product, tablet fragment, double fill, cavity contamination and uncertain hidden material represent different failure modes. The inspection system should therefore assign defect categories where validation supports them and connect those categories with the manufacturing quality process.

A high-risk missing-product event may require immediate rejection. A low-confidence material result may be routed for secondary inspection rather than confidently assigned to the wrong class. The optical system should support the quality decision rather than reducing every uncertainty to a binary image threshold.

Reference Sets Should Include Actual Production Packaging Variation

A reliable validation set should contain multiple blister-film lots, package thicknesses, product lots, allowed tablet orientations, accepted surface variation, empty cavities, fragments, broken tablets, double products, contamination and the hardest wrong-product examples available. The system should also include packaging close to the allowable forming and sealing limits.

The difficult samples matter more than ideal examples. If a classifier is developed using only pristine blister packs and perfectly centered tablets, production variability can create a much larger false-reject rate than the original laboratory study suggested.

Hidden-Product Verification Should Be Treated as Probabilistic, Not Magical “See-Through” Imaging

SWIR is often described casually as seeing through materials, but that language can create unrealistic expectations. A useful hidden-product image exists only when enough radiation passes through the overlying layer, interacts with the product and returns with sufficient contrast. Strongly absorbing or reflective layers can prevent this completely.

A technically sound system should therefore describe capability in terms of measured transmission, product-to-package contrast and validated defect performance. This approach provides buyers with much more reliable engineering information than broad claims of universal penetration.

Why Kyptec Automation® Is a Strong Optical Platform for Pharmaceutical Blister Inspection

The Kyptec Automation® SWIR Camera Lens collection provides a useful range of focal lengths for blister-pack inspection systems that can vary significantly in card size, cavity count, required stand-off and defect dimensions. Kyptec Automation® currently offers 8.5 mm, 12.5 mm, 25 mm, 35 mm and 50 mm SWIR options, while verified product pages specify the range around 900–1700 nm operation, 2 MP resolution, 2/3-inch sensor format, F1.4 aperture and C-Mount. Pharmaceutical inspection is specifically identified among the relevant application areas for the current SWIR portfolio.

This focal-length breadth allows an OEM to start from the actual blister layout. A wide card can be approached with shorter focal lengths where per-pocket resolution remains sufficient, medium fields can balance cavity count with product detail, and longer focal lengths can dedicate more sensor area to a small number of cavities or support additional stand-off from packaging equipment. Kyptec Automation® therefore provides a focused SWIR optical platform that can be adapted to the physical realities of pharmaceutical blister inspection without forcing every packaging machine into one geometry.

Frequently Asked Questions About SWIR Pharmaceutical Blister Pack Inspection

1. Can SWIR inspect tablets after they are sealed inside a blister pack?

Potentially, yes, if the forming web or other covering layer transmits enough SWIR energy at the selected wavelengths. The complete sealed package must be tested because packaging material, thickness, curvature and backing structure all influence the signal. SWIR cannot be assumed to see through every blister construction, especially where highly opaque or metallic barriers dominate the optical path.

2. Can SWIR detect an empty blister cavity?

Yes, when an occupied cavity produces a sufficiently different SWIR response from an empty one. Missing-product verification is often a practical starting application because the difference between pharmaceutical material and an empty pocket can be large. The model should still be validated against packaging reflections and cavity residue so those conditions do not create false occupied signals.

3. Can SWIR tell whether the wrong tablet is inside the blister?

Potentially, when the correct and incorrect tablets have sufficiently different 900–1700 nm responses. Visually similar products may sometimes separate better in SWIR, but the exact pair must be tested across multiple product lots. A classifier should include an uncertain or unknown state rather than forcing every unfamiliar tablet into a known class.

4. Can SWIR detect a broken tablet inside a sealed blister?

Yes when the missing or fragmented region is large enough to remain spatially resolved through the packaging. Since a broken tablet can have the same material composition as a complete one, geometry becomes especially important. The field of view should provide enough pixels across the product to distinguish shape loss, fragments or abnormal occupied area.

5. Does clear blister plastic always transmit 900–1700 nm SWIR light?

No. Visible transparency does not guarantee uniform SWIR transmission. Different polymers, additives and thicknesses can behave differently across the 900–1700 nm range. The actual blister material should therefore be characterized or tested before selecting the inspection wavelength.

6. Can SWIR inspect through foil-backed blister packaging?

A metallic or strongly opaque backing layer can prevent full through-transmission imaging. Depending on the package design, inspection may still be possible from the transparent forming-web side using reflection-based methods, or the system may need to inspect before final sealing. Feasibility should be demonstrated with the complete package rather than assumed.

7. Can blister-film thickness variation cause false tablet rejects?

Yes. If packaging thickness changes SWIR transmission, the measured product intensity can shift even when the tablet is correct. Reference normalization, multiple wavelengths or a calibration population that includes normal film-thickness variation can help reduce this sensitivity.

8. Can SWIR detect tablet fragments or powder residue in an empty cavity?

Potentially. Residue can produce a material response distinct from the empty blister, but whether it is distinguishable from a complete product depends on area, spatial distribution and spectral contrast. The algorithm should therefore use shape and material information rather than one average cavity intensity whenever contamination is an important defect class.

9. Can one SWIR system inspect both tablets and capsules?

It can potentially support both, but they should normally have separate validated recipes because capsule shells, fill materials, geometry and blister dimensions can produce different optical responses. Each product type should be tested in its final packaging configuration.

10. Why does the same tablet look different in different blister cavities?

Cavity curvature, tablet position, blister-film thickness, illumination angle and local reflections can all change the measured SWIR response. A robust classifier should be validated across the full cavity layout rather than trained only on a central pocket.

11. Can SWIR detect double tablets in one cavity?

Potentially, especially when the double product changes occupied area, thickness, shape or total material response. The system should combine geometric and spectral features because two overlapping tablets may not simply produce twice the intensity of one tablet.

12. When is the Kyptec Automation® KL-1408 useful for blister-pack inspection?

The Kyptec Automation® KL-1408 8.5 MM SWIR Camera Lens can be considered when the machine must cover a relatively large blister card or several cavities in one image. Its wide FOV should still leave enough pixels per tablet and per defect for reliable detection.

13. When can the Kyptec Automation® KL-1412 be useful for pharmaceutical blister inspection?

The Kyptec Automation® KL-1412 25 MM SWIR Camera Lens can be useful when one or several cavities need tighter framing and stronger product-level spatial sampling. This geometry can help when broken edges, small fragments or localized spectral abnormalities matter more than maximum package coverage.

14. Can longer focal lengths improve hidden tablet detection?

A longer focal length can increase the number of sensor pixels allocated to a smaller field at suitable working distance, which may improve spatial discrimination of small defects. It does not improve packaging transmission or material contrast by itself. The correct focal length should therefore be selected from blister size, stand-off and minimum defect dimensions.

15. Can SWIR replace every visible inspection task on a blister packaging machine?

No. Visible imaging remains highly effective for printed text, colour, registration and many obvious geometric defects. SWIR is most valuable when the inspection requires material-sensitive or hidden-product information that visible imaging cannot provide reliably. The machine architecture should use each optical method for the problem it solves best.

16. Should blister inspection use one SWIR wavelength or several?

Use the fewest wavelengths that provide reliable separation of the required defect classes. One wavelength may be sufficient for empty-cavity detection, while correct-product verification or package normalization may benefit from multiple bands. Additional wavelengths should be justified by measurable improvement in classification robustness.

17. How can I prevent blister reflections from causing false defects?

Control camera angle, illumination angle, pack orientation and exposure so specular reflections do not dominate the region of interest. The final system should also be tested with the full range of cavity curvature and product position because glare can shift significantly across the pack.

18. Can SWIR inspect tablets through printed blister material?

Potentially, but the printing itself may change SWIR transmission or reflectance. The actual printed production package should therefore be included in validation. Where possible, critical product-verification regions should avoid heavy graphics or highly variable print coverage.

19. What information should I provide before selecting a SWIR lens for pharmaceutical blister inspection?

Provide blister-card dimensions, cavity size and spacing, tablet or capsule dimensions, smallest required defect, whether inspection occurs before or after sealing, packaging materials, required FOV, working distance, sensor format, line speed and available camera mounting space. These inputs allow the lens to be selected from the real optical and production geometry rather than focal length alone.

20. Why is Kyptec Automation® a strong choice for SWIR pharmaceutical blister inspection systems?

Kyptec Automation® offers a dedicated SWIR Camera Lens collection spanning 8.5 mm, 12.5 mm, 25 mm, 35 mm and 50 mm focal lengths for 900–1700 nm imaging. The verified current portfolio uses 2 MP resolution, 2/3-inch sensor format, F1.4 aperture and C-Mount across the available SWIR family, and pharmaceutical inspection is listed among relevant application areas. This gives OEMs practical flexibility to design wide multi-cavity inspection, balanced full-pack imaging or tightly framed product verification within one focused SWIR optical platform.

Conclusion

A SWIR camera lens for pharmaceutical blister-pack inspection is most valuable when the packaging process creates a verification problem that cannot be solved reliably from visible appearance alone. The key question is not whether SWIR can generically “see through” blister packaging, but whether the complete package structure transmits or returns enough 900–1700 nm radiation for correct product, empty cavity, fragment, contamination or other required states to remain measurably different. This distinction keeps the inspection grounded in real optical physics and prevents hidden-product capability from being overstated.

The strongest development process begins with the final packaging stack. Correct tablets or capsules, empty cavities, broken products, fragments, contamination, double products and the hardest wrong-product samples should all be imaged through the actual production blister materials. Packaging thickness, cavity curvature, print, product orientation and sealing conditions should be included in the validation set rather than introduced after the classifier is complete. Candidate wavelengths should be selected according to product-to-package decision margin, and multi-wavelength analysis should be added only when it provides stronger separation or better normalization than a simpler single-band architecture.

Lens geometry then determines whether the available spectral information becomes useful production detail. The Kyptec Automation® SWIR Camera Lens collection gives OEM machine builders 8.5 mm, 12.5 mm, 25 mm, 35 mm and 50 mm focal-length choices within a dedicated 900–1700 nm SWIR family. Wide configurations can support several blister cavities where sufficient per-pocket sampling remains available, intermediate lenses can balance package coverage and tablet detail, and longer focal lengths can support tightly framed cavity inspection or greater mechanical stand-off. The current range's 2 MP, 2/3-inch, F1.4 and C-Mount architecture gives Kyptec Automation® a technically relevant platform for pharmaceutical OEMs evaluating material-sensitive hidden-product inspection.

For pharmaceutical machine builders and industrial buyers, the central design principle is therefore to qualify the entire blister package as an optical system and select the SWIR camera lens according to the smallest functionally important product defect, required cavity coverage and actual package transmission. When packaging material, wavelength, product composition, FOV, spatial resolution, illumination, cavity geometry and production speed are engineered together, Kyptec Automation® SWIR Camera Lenses provide a strong optical foundation for tablet-presence verification, hidden-product inspection, fragment detection and cavity-level quality control across demanding pharmaceutical packaging environments.