SWIR Camera Lens for Industrial Leak and Seal Integrity Inspection: Detecting Moisture Paths, Seal Failures and Hidden Leakage Evidence

Industrial leak and seal integrity inspection becomes difficult when the failure is not a large visible opening but a microscopic channel, incomplete seal, trapped contamination, capillary leakage path or small quantity of liquid that migrates away from the original defect. A package, pouch, enclosure, reservoir, container or sealed component can look completely acceptable under visible illumination while moisture associated with a developing leak remains almost invisible. 900–1700 nm SWIR imaging for leak detection and seal integrity inspection provides a different route because water and many water-containing materials absorb strongly at selected short-wave infrared wavelengths, particularly around 1450 nm. This makes localized moisture capable of producing significant SWIR contrast even where the same leakage evidence has weak visible contrast. Water's strong absorption near 1450 nm is well established in SWIR imaging and is already used for applications including moisture visualization and liquid detection through selected packaging materials.

For machine builders, however, the goal should not be described simply as “finding water.” The more commercially useful objective is to determine whether the image contains evidence associated with a sealing failure, where that evidence originates, how far it has migrated, whether the affected area exceeds an acceptance limit and whether the signal can be differentiated from normal process moisture, condensation or surface contamination. The dedicated Kyptec Automation® SWIR Camera Lens collection supports this type of system design with 8.5 mm, 12.5 mm, 25 mm, 35 mm and 50 mm focal lengths. Current Kyptec Automation® product information confirms representative SWIR models operating from 900–1700 nm with 2 MP resolution, 2/3-inch sensor format, F1.4 aperture and C-Mount, providing a practical optical family for wide seal inspection, localized leak-path imaging and longer-working-distance stations.

Seal Integrity Inspection Should Focus on Evidence of Failure, Not Only the Opening

A seal can fail at a point much smaller than the visible moisture pattern it eventually creates. Liquid may migrate along a heat-sealed interface, absorb into a porous layer, spread beneath a film, collect around a gasket or move through a narrow capillary path before becoming externally visible. Consequently, the most useful SWIR signature may not be the actual microscopic opening. It may be the moisture trail produced by the opening.

This distinction changes the inspection strategy. Instead of attempting to resolve a 50 µm channel directly, an SWIR system may detect the several-millimetre wet region created after liquid has travelled through that channel. In suitable applications, this can make an otherwise difficult leak easier to identify optically. The system must nevertheless be validated against the minimum leak condition that matters commercially because not every seal defect produces enough moisture to create a detectable SWIR signature.

Why Moisture Becomes Highly Visible Around Selected SWIR Wavelengths

Water contains O–H molecular bonds whose overtone and combination absorption bands produce strong attenuation at selected near-infrared and SWIR wavelengths. Around 1450 nm, the response is particularly useful for industrial imaging because water-rich regions can become considerably darker than surrounding dry material under appropriate illumination. Sources covering SWIR imaging applications consistently identify approximately 1450 nm as a strong water-absorption region used for moisture and liquid detection.

This provides a useful physical basis for non-contact moisture leak detection. A dry sealing flange may transmit or reflect relatively strongly, while a narrow water-containing contamination path may attenuate the selected wavelength. The resulting contrast can be mapped spatially to reveal where moisture is concentrated.

The exact intensity should not be converted directly into leakage volume without calibration. Material thickness, illumination, substrate, liquid composition and optical geometry all affect the recorded response.

A Moisture Path Can Reveal How a Seal Is Failing

A localized circular wet region and a long narrow moisture trail may contain similar total liquid quantities but suggest different failure mechanisms. Imaging preserves this geometry. A thin line crossing a seal may indicate a continuous leakage path, while an irregular wet region concentrated at one corner may indicate a localized sealing weakness.

A machine can therefore calculate more than wet-versus-dry status. Useful measurements include moisture-path length, width, connected area, distance across the seal boundary, orientation and whether the wet region connects the product side of the seal with the external side. This makes SWIR particularly valuable for seal leakage inspection where defect morphology matters.

Seal Contamination Can Be Detected Before a Large Leak Develops

In many sealing processes, contamination enters the sealing region before closure. Product residue, aqueous liquid or another moisture-containing material trapped inside the seal can prevent complete bonding and create a future leakage path. At selected wavelengths, that contamination may produce stronger contrast than it does under visible illumination.

The inspection system can therefore be positioned immediately after sealing to search for moisture-containing material inside the critical seal width. A contaminated seal can be rejected before storage, transport or pressure changes convert the weakness into a larger leak.

Infrared seal-inspection concepts around approximately 1450 nm have specifically described detection of moisture-containing contamination in sealed areas because water attenuates the chosen infrared radiation while selected polymer seal materials remain comparatively transmissive.

A Seal Region Should Be Inspected as a Defined Geometric Zone

Whole-package analysis can dilute small seal defects. A more effective method defines a region of interest that follows the seal itself. The algorithm can then distinguish the product-side boundary, central seal zone and outer edge.

If moisture appears only inside the product area, it may be normal. If it crosses into the sealing zone, it becomes more significant. If a continuous moisture path reaches the outside boundary, the risk can be considerably higher. This spatial relationship gives the system information that a simple whole-image moisture threshold cannot provide.

Kyptec Automation® KL-1408 Can Support Wide Seal and Multi-Pack Inspection

Where several sealed products or a large package perimeter must be inspected simultaneously, the Kyptec Automation® KL-1408 8.5 MM SWIR Camera Lens can be evaluated for broad field coverage. Within the current Kyptec Automation® SWIR portfolio, its shorter focal length makes it suitable for applications where the inspection system must capture a large sealing region from a practical machine working distance.

The wider field should not be selected without checking pixels across the smallest leakage path. If a 1 mm-wide moisture trail becomes represented by only one or two pixels, its contrast can be averaged with surrounding dry material. The strongest design is therefore the widest field that still resolves the minimum unacceptable seal abnormality with adequate margin.

Minimum Detectable Leak Is Not the Same as Minimum Detectable Wet Area

A leak specification may be expressed as an opening diameter, pressure-decay rate, flow rate or allowable fluid loss. SWIR imaging observes optical evidence rather than directly measuring all of those quantities. A tiny hole may create a large wet area after sufficient time, while a larger hole may remain optically dry if no liquid reaches it during inspection.

For this reason, buyers should define whether the machine needs to detect seal contamination, active leakage, residual moisture, migration paths or a specific leak-rate equivalent. If a correlation with leak rate is required, SWIR measurements must be calibrated against a suitable independent leak reference.

Dwell Time Between Sealing and Inspection Can Change Sensitivity

Moisture needs time to migrate. An inspection performed immediately after a seal is formed may observe only the material initially trapped at the interface, whereas an inspection several seconds or minutes later can reveal a developing moisture path.

This means camera location along the production line becomes part of sensitivity. The optimum inspection delay is application-specific. The machine builder should test several intervals after sealing and determine when unacceptable defects generate strong separation from good seals without unnecessarily slowing production.

Liquid Composition Matters

Water-rich liquids normally produce strong SWIR absorption around the water bands, but industrial leakage can involve oils, solvents, adhesives, process fluids or mixed formulations whose spectral behaviour differs significantly. A system developed on pure water should therefore not automatically be assumed to detect every process liquid equally well.

The actual leaking substance should be measured at candidate wavelengths. In some cases, a non-water liquid can still provide useful SWIR contrast because of its own molecular absorption. In other cases, the strongest detection wavelength may be different from the conventional water-sensitive region.

Diluted Moisture Can Produce a Weaker Leakage Signature

A highly concentrated water-based fluid can produce strong attenuation, while a thin diluted residue may create a weaker signal. Leak qualification should therefore include the lowest liquid concentration and smallest residue expected at the decision boundary.

It is also useful to test partly dried leak traces because manufacturing or handling delays may allow water to evaporate. A system that detects a fresh wet path strongly may not necessarily detect the same region after substantial drying.

Reflection Imaging Is Useful When the Seal Can Only Be Viewed From One Side

In reflection geometry, SWIR illumination and the camera operate from the same general side of the seal. Moisture near the accessible surface can change the returned signal and create localized contrast. This arrangement can be easier to integrate into machines where illumination cannot be positioned behind the product.

Reflection systems must control glare from glossy films, coated surfaces and polished enclosure materials. A strong specular reflection can overwhelm a weak moisture signal. Illumination angle, camera angle and package orientation should therefore be stabilized as part of the optical design.

Transmission Imaging Can Reveal Moisture Through Selected Package Materials

When the sealing material transmits sufficient SWIR radiation, placing illumination behind the package can create strong contrast between relatively transmissive dry material and moisture-containing regions that absorb more strongly. SWIR systems are used in related industrial applications to visualize liquid through selected packaging structures, demonstrating the advantage of wavelength-dependent packaging transmission.

Transmission is not possible through every material. Metallic foil, thick absorptive structures or unsuitable pigments can block the useful wavelength. The final package stack must therefore be tested directly rather than classified simply as “plastic,” “film” or “opaque.”

Packaging Transparency in Visible Light Does Not Predict SWIR Behaviour

A visibly clear film can contain additives that absorb SWIR, while some materials that look visually opaque may transmit useful infrared wavelengths. Consequently, visible appearance is a poor basis for deciding whether moisture can be inspected through a package.

The machine builder should measure three states: dry packaging alone, packaging plus normal product, and packaging plus the minimum unacceptable leak condition. The selected wavelength should maximize separation between acceptable and defective states rather than simply maximize package transparency.

The Kyptec Automation® KL-1410 Can Balance Seal Coverage and Leak-Path Detail

The Kyptec Automation® KL-1410 12.5 MM SWIR Camera Lens provides an intermediate optical option where an entire sealing zone needs to remain visible but localized wet regions also require useful spatial sampling. The verified live product specification identifies the Kyptec Automation® KL-1410 with 12.5 mm focal length, 900–1700 nm wavelength range, 2 MP resolution, F1.4 aperture, 2/3-inch sensor format and C-Mount.

For medium-sized packages, gaskets or enclosure seals, this balance can be more useful than maximizing either coverage or magnification alone.

Hidden Moisture Beneath an Overlapping Seal Layer Can Still Be Detectable

Some seals contain overlapping polymer layers where contamination becomes physically covered after sealing. If the upper layer has useful SWIR transmission, moisture trapped underneath can still influence the recorded image. This creates a potential hidden seal contamination inspection capability unavailable to purely surface-colour analysis.

Detection depends on the total optical path. As packaging thickness increases, less signal may reach the trapped moisture and return to the camera. Validation should therefore use the maximum layer thickness allowed in production.

False Leak Indications Can Come From Condensation

Condensation contains the same water that the inspection system is designed to detect. A cold product entering a warm environment may therefore generate moisture on an otherwise perfect seal and produce a strong SWIR response.

The solution is not simply to weaken moisture sensitivity. The system should characterize where normal condensation forms, how its spatial pattern differs from leakage and whether inspection can be positioned before or after the condensation-prone stage. Where necessary, temperature or timing information can be incorporated into the process logic.

Cleaning Water Can Also Create False Rejects

Washdown operations, rinse stages or cleaning residues can leave small quantities of water on machine parts or package surfaces. If inspection occurs before surfaces are sufficiently dry, these residues can resemble leakage.

Production validation should therefore include normal post-cleaning conditions rather than only dry laboratory samples. A reference region outside the seal can help determine whether an entire package is generally wet or whether moisture is specifically concentrated along the sealing boundary.

Seal Geometry Can Affect SWIR Signal Even Without Moisture

Heat seals can vary in thickness, texture, pressure marks and surface angle. These geometric changes alter reflection and transmission independently of leakage. If the algorithm learns one perfectly flat reference seal, normal production texture can create unnecessary false alarms.

The good-seal population should include realistic variation from different tooling positions and production cycles. The decision should emphasize spectral features specifically associated with moisture or abnormal material rather than any change in brightness.

A 25 mm SWIR Lens Can Support Localized Seal-Interface Inspection

Where the relevant seal area is comparatively small, the Kyptec Automation® KL-1412 25 MM SWIR Camera Lens can be evaluated for tighter framing. Current product information confirms the Kyptec Automation® KL-1412 as a 25 mm, F1.4, 2 MP, 2/3-inch, C-Mount lens designed for 900–1700 nm imaging. This geometry can allocate more pixels to narrow sealing channels, gasket edges or localized suspected leakage zones.

The benefit is greater spatial sampling, not inherently stronger water absorption. Moisture contrast comes from spectral interaction; the lens determines how effectively that contrast is resolved across the required physical area.

Moisture-Path Width Can Be More Useful Than Average Intensity

A large but faint wet region can have the same average image intensity as a small highly saturated region. These two conditions may represent different failure risks. The machine should therefore preserve morphological measurements instead of collapsing the entire seal into one mean value.

Useful parameters can include maximum connected wet-path length, minimum path width, total affected area, number of separate wet regions and whether any connected region crosses the full sealing width.

Connectivity Analysis Can Distinguish Harmless Moisture From a Leakage Route

Consider a seal 10 mm wide. A 2 mm wet spot entirely inside the product-side boundary may be less concerning than a 0.5 mm-wide path extending continuously across all 10 mm. The second defect creates a connected route between the inside and outside even though its total wet area is smaller.

Image processing can therefore identify connected components and determine whether any moisture region bridges critical boundaries. This transforms SWIR moisture imaging into a more specific seal integrity decision.

Time-Series Imaging Can Show Active Leak Growth

If the same component can be imaged repeatedly after pressure, filling or sealing, an active leak may produce a growing moisture region. The area, length or SWIR absorption intensity can be tracked over time. A region that expands systematically provides stronger evidence of active leakage than a static stain.

This is especially useful during engineering validation because it helps separate pre-existing surface contamination from liquid that continues to migrate through a defective interface.

Multi-Wavelength Imaging Can Separate Moisture From Background Variation

A water-sensitive wavelength can be combined with a reference wavelength that is less affected by water. If both wavelengths become darker because of general shading, geometry or illumination, their ratio may remain relatively stable. If only the water-sensitive band changes strongly, the ratio highlights moisture.

A simplified normalized index can be written as:

M = (Iref − Iwater) / (Iref + Iwater)

where (Iwater) represents response at a water-sensitive wavelength and (Iref) represents an appropriate reference band. The exact wavelengths and threshold should be selected experimentally for the package and liquid rather than treated as universal constants.

F1.4 Can Help When Packaging or Narrowband Illumination Reduces Available Signal

A water-sensitive narrowband system may deliver substantially less optical energy than broad illumination, while packaging layers can attenuate the signal further. The F1.4 maximum aperture available across verified Kyptec Automation® SWIR models can therefore be useful for maintaining practical exposures in high-speed inspection.

Maximum aperture should still be balanced against depth of field. Thick packages, raised seals and components with dimensional tolerance may require additional focus range, so the best operating aperture is determined under final machine conditions.

Motion Blur Can Hide Narrow Leakage Paths

A package moving at 2 m/s travels 0.4 mm during a 200 µs exposure. If the target is a 0.5 mm-wide moisture path oriented across the direction of motion, that displacement can substantially weaken its apparent contrast.

High-speed seal inspection should therefore calculate allowable blur from the minimum defect dimensions. Increasing illumination to permit shorter exposure can sometimes improve defect detection more effectively than applying additional image processing afterward.

Long Focal Lengths Can Support Seal Inspection Around Restricted Machinery

Some sealing machines limit how close the camera can be positioned because of heaters, tooling, robotics, guarding or moving mechanisms. 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 that can be evaluated where the required seal field must be maintained at greater stand-off. Their verified product pages confirm 900–1700 nm, 2 MP, 2/3-inch and F1.4 specifications within the same Kyptec Automation® SWIR family.

These longer focal lengths are especially relevant when a small gasket, weld perimeter or sealing interface needs to occupy a substantial portion of the image without positioning the optical system close to process hardware.

Leak-Detection Thresholds Should Be Based on Defective Samples, Not Image Appearance

A threshold selected because the image “looks wet” is difficult to reproduce. Instead, the development dataset should include verified good seals, small acceptable moisture conditions, minimum unacceptable leakage, gross leaks, condensation, product residue and other realistic false-positive sources.

The algorithm can then determine how far the defective population separates from the acceptable population. For critical quality applications, an uncertain zone between confident good and confident reject classifications is often more defensible than forcing every borderline seal into a binary result.

SWIR Seal Inspection Should Complement the Actual Integrity Requirement

SWIR imaging detects optical evidence. It should not automatically be described as equivalent to pressure-decay, vacuum or other physical integrity measurements unless a validated correlation has been demonstrated. Certain dry microscopic channels may have no moisture signature at the moment of inspection.

The strongest use case is therefore where the process naturally produces a moisture-containing contaminant or leakage path that SWIR can visualize, or where a controlled challenge introduces an appropriate liquid indicator. Buyers should select the inspection principle according to the failure mode that must actually be controlled.

Why Kyptec Automation® Is a Strong Optical Platform for Leak and Seal Integrity Inspection

The Kyptec Automation® SWIR Camera Lens collection provides a focused selection of 8.5 mm, 12.5 mm, 25 mm, 35 mm and 50 mm focal lengths for industrial imaging across 900–1700 nm. Current verified Kyptec Automation® product pages specify representative lenses at 2 MP resolution, 2/3-inch sensor format, F1.4 aperture and C-Mount.

That range is useful because industrial seal-inspection geometries vary considerably. Short focal lengths can support broad packages or several sealing areas in one field; intermediate optics can balance complete seal coverage with moisture-path detail; and longer focal lengths can concentrate sensor pixels on narrow interfaces or accommodate greater working distance around sealing equipment. Kyptec Automation® therefore provides machine builders with a strong SWIR-focused optical platform that can be selected according to seal dimensions, minimum moisture-path size, working distance and required coverage rather than forcing one optical geometry onto every leakage application.

Frequently Asked Questions About SWIR Leak and Seal Integrity Inspection

1. Can a SWIR camera lens detect a leak before liquid is visible to the eye?

Potentially, yes, when an early leak produces a moisture-containing region whose SWIR absorption differs from the surrounding dry material. Water has a strong absorption band near 1450 nm, so small wet regions can create substantial contrast under appropriate illumination even when visible colour changes are weak. Detection still depends on the amount of moisture, package material and spatial resolution.

2. Can SWIR find the actual hole in a leaking seal?

Sometimes the opening itself may be resolvable, but the more practical SWIR target is often the moisture path produced by the defect. A microscopic channel can create a wet region many times larger than itself. If the quality requirement specifically concerns hole diameter, the relationship between the observed SWIR region and physical opening must be validated independently.

3. Can SWIR detect liquid trapped inside a heat-sealed area?

Potentially, especially when the trapped material contains water and the seal layers transmit enough SWIR radiation. Moisture-containing contamination can attenuate radiation around water-sensitive wavelengths and produce a local contrast change inside the seal region. The actual film stack and contaminant should be tested under production conditions.

4. Can SWIR detect incomplete seals that are still dry?

Not necessarily. If an incomplete seal produces no material, geometric or moisture-related contrast accessible to SWIR, it may remain difficult to detect. SWIR is particularly strong when the seal failure is accompanied by moisture, liquid contamination or an optically distinguishable interface abnormality.

5. What wavelength is useful for water-based leak detection?

Approximately 1450 nm is particularly important because water absorbs strongly in this spectral region, making moisture appear darker under suitable SWIR imaging conditions. The final wavelength should still be selected using the actual package and leaking liquid because packaging transmission and liquid composition affect contrast.

6. Can SWIR inspect moisture underneath plastic packaging?

Potentially, if the plastic provides sufficient transmission at the selected SWIR wavelength. Some selected package materials permit liquid or moisture information to be imaged through the surrounding structure. The exact material, pigmentation and thickness must be validated rather than assuming every plastic behaves identically.

7. Can SWIR differentiate condensation from a real seal leak?

It may be possible when condensation and leakage produce different spatial patterns, but both contain water and therefore can generate strong SWIR response. The inspection algorithm should evaluate location, connectivity, timing and morphology instead of relying on moisture intensity alone.

8. Can SWIR detect a moisture path crossing a seal?

Yes, provided the path produces sufficient contrast and is spatially resolved. The image can be analyzed for whether a connected wet region extends from the product-side boundary to the outside of the sealing zone. This can be more informative than simply measuring total wet area.

9. How small a leak path can SWIR detect?

The answer depends on physical moisture-path width, FOV, sensor sampling, optical sharpness, illumination and absorption contrast. A narrow path represented by many pixels is easier to detect than one occupying only one or two pixels. The smallest commercially unacceptable path should therefore be specified before focal length is selected.

10. Can SWIR inspect seals on a high-speed conveyor?

Yes, where illumination is strong enough to support an exposure short enough to control motion blur. The maximum line speed should be tested using the smallest required moisture path because larger wet regions may remain visible even when fine leak evidence becomes blurred.

11. Can a SWIR seal-inspection system work with coloured or printed packaging?

Potentially. Visible colour alone does not determine SWIR transmission, but pigments and inks can still absorb or reflect SWIR wavelengths. The final printed production material must therefore be included during qualification rather than testing only transparent unprinted samples.

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

The Kyptec Automation® KL-1408 8.5 MM SWIR Camera Lens can be evaluated when a broad package perimeter or several seal regions must be captured in one field. The final system should verify that the smallest unacceptable moisture path still receives sufficient pixel coverage.

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

The Kyptec Automation® KL-1412 25 MM SWIR Camera Lens can be useful where one smaller seal interface, gasket or suspected leakage zone should occupy more of the available sensor area. Tighter framing can improve spatial sampling of narrow moisture paths without changing the underlying spectral absorption.

14. Can a longer focal-length lens detect less moisture?

Not because of focal length itself. Longer focal lengths change field of view and image scale. They may help a small wet region occupy more pixels when the inspection field is narrow, but the actual moisture contrast is primarily controlled by wavelength, material interaction and available signal.

15. Can SWIR detect leaks containing liquids other than water?

Potentially, but their useful wavelengths may differ. Oils, solvents and process fluids have different molecular absorption characteristics, so a system optimized for the 1450 nm water band should not automatically be assumed to detect them. The actual leakage fluid should be characterized experimentally.

16. Why does a leak sometimes become easier to detect several seconds after sealing?

Moisture can migrate from the original defect and create a larger optical footprint over time. A microscopic leakage route that is initially difficult to resolve may therefore produce a detectable wet path after a short dwell period. Inspection timing should be optimized during process validation.

17. Can SWIR quantify how severe a seal leak is?

It can quantify optical features such as wet area, moisture-path length, intensity change and growth over time. Converting those quantities into leak rate or physical opening size requires a validated calibration against an appropriate reference method. Optical severity and physical leak rate should not be treated as automatically equivalent.

18. Should SWIR leak inspection use one wavelength or two?

A single water-sensitive wavelength may be sufficient for applications with stable packaging and strong moisture contrast. A second reference wavelength can be useful when surface geometry, package shading or illumination variation causes false changes. Comparing the two bands can make moisture-specific contrast more robust.

19. What information should I provide before selecting a SWIR lens for leak and seal inspection?

Provide the seal dimensions, package or enclosure material, leaking fluid, smallest unacceptable moisture path, required inspection area, working distance, sensor format, line speed, whether reflection or transmission is possible, package-height variation and available mounting space. Those parameters determine whether a wide, intermediate or narrow Kyptec Automation® SWIR focal length is most appropriate.

20. Why is Kyptec Automation® a strong choice for industrial leak and seal integrity 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. Verified current product information confirms representative lenses with 2 MP resolution, 2/3-inch sensor format, F1.4 aperture and C-Mount. This gives OEMs useful freedom to design broad seal inspection, detailed leak-path imaging or longer-working-distance stations while remaining within one focused SWIR optical portfolio.

Conclusion

A SWIR camera lens for industrial leak and seal integrity inspection can create substantial value when the failure leaves moisture or liquid evidence that is difficult to distinguish under visible illumination. Strong water absorption around 1450 nm gives SWIR imaging an important physical advantage for visualizing wet regions, liquid paths and moisture-containing contamination. The critical engineering principle, however, is to avoid treating every dark SWIR region as a leak. Condensation, cleaning residue, product moisture, package variation and surface geometry can all create competing signals, so the inspection must be designed around the actual failure mechanism.

The strongest development process starts with deliberately produced good and defective seals. The validation set should include the minimum unacceptable leakage condition, moisture-containing contamination, partial seal failures, narrow migration paths, condensation, acceptable surface moisture and realistic package variability. Testing should determine not only whether moisture is detectable but whether a connected path crosses critical seal boundaries, how small that path can be, how quickly it becomes visible after sealing and how reliably it separates from normal production variation. Where the application requires correlation with physical leak rate, that relationship should be established independently rather than inferred from SWIR intensity alone.

Lens geometry then determines whether this spectral contrast becomes usable spatial information. The Kyptec Automation® SWIR Camera Lens collection provides focal lengths from 8.5 mm through 50 mm for 900–1700 nm imaging. Shorter focal lengths can support larger packages and multiple seals, intermediate options can balance complete sealing-zone coverage with localized leak detail, and longer lenses can devote greater sensor area to small interfaces or maintain tight framing from greater stand-off. The current Kyptec Automation® SWIR portfolio's 2 MP, 2/3-inch, F1.4 and C-Mount configuration provides a technically useful foundation for OEMs developing non-contact moisture-sensitive inspection around packaging lines, sealed components and industrial enclosures.

For machine builders and industrial buyers, the central design principle is therefore to define the physical seal failure first, identify the moisture or liquid signature it creates, validate that signature at the appropriate SWIR wavelength, and then select the SWIR camera lens so the smallest critical leakage evidence remains spatially resolved at production speed. When moisture absorption, seal geometry, packaging transmission, inspection delay, FOV, working distance, exposure and real process variability are engineered together, Kyptec Automation® SWIR Camera Lenses provide a strong optical platform for detecting moisture paths, seal contamination, hidden leakage evidence and selected seal-integrity failures that can remain difficult to identify from visible appearance alone.