Sidelites/Backlites

Stress Photonics provides a wide range of inspection tools to examine automotive sidelite/backlite

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Sidelite/Backlite Edge Stress

Sidelite/Backlite Edge Stress

The EdgeMaster 2 is a very useful tool for edge stress measurement of tempered glass products. This real-time inspection system with integrated edge guide is easy to use. The system is hand-held and specifically designed to slide along the edge of a sidelite, backlite, windshield, or sunroof. When imaging a windshield, backlite, or sunroof, the system can reflect light off black frit to measure edge stress. These measurements can be logged at key locations. There are some limits with darker tinted glass. Contact our team of experts for details.

The GFP1600 REFLECT (GFP1600 with reflection illuminators) can also measure stress on the frit, including edge stress. Because it’s a more general purpose instrument, more set-up may be required.

Automotive Sidelite

Shear Max image of a tempered sidelite showing potential compression depletion spots near the edge. Light is reflected off the black frit.

Automotive Sidelite

Visible light image of the area measured in the previous stress image. Recognizable frit pattern. Light is reflected off the black frit.

Automotive Sidelite

Close-up of tempered sidelite edge.
Image measures 25mm in height.
Line plot shown in the next image.

Automotive Sidelite

Line plot through the zone outlined in green on the previous automotive sidelite stress image. Plot shows compression and tension.

Automotive Sidelite

Visible light image of previous close-up stress image. Edge grind is recognizable.
Light is reflected off the black frit.
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Sidelite / Backlite
Area Stress / Temper Patterns

Sidelite / Backlite Area Stress / Temper Patterns

The GFP1600 FPI (Flat-Panel Illuminator) is an excellent tool for measuring temper patterns. The system measures the average stress through the glass and can show the imbalance in tempering, although it does not explicitly provide the surface (skin) stress.

Automotive Backlite Visible Light

Visible light image of an automotive backlite. The image above was acquired with the GFP™1600 FPI (Flat Panel Illuminator).

Automotive Backlite Shear 45

Shear 45 image of an automotive backlite. The image above was acquired with the GFP™1600 FPI (Flat Panel Illuminator).

Automotive Backlite Shear 0

Shear 0 image of an automotive backlite. The image above was acquired with the GFP™1600 FPI (Flat Panel Illuminator).

Automotive Backlite Shear Max

Shear Max image of an automotive backlite. The image above was acquired with the GFP™1600 FPI (Flat Panel Illuminator).

Automotive Backlite Visible Light

Visible light image of an automotive backlite. The image above was acquired with the GFP™1600 FPI (Flat Panel Illuminator).

Automotive Backlite Shear 45

Shear 45 image of an automotive backlite. The image above was acquired with the GFP™1600 FPI (Flat Panel Illuminator).

Automotive Backlite Shear 0

Shear 0 image of an automotive backlite. The image above was acquired with the GFP™1600 FPI (Flat Panel Illuminator).

Automotive Backlite Shear Max

Shear Max image of an automotive backlite. The image above was acquired with the GFP™1600 FPI (Flat Panel Illuminator).

Automotive Backlite Visible Light

Visible light image of an automotive backlite. The image above was acquired with the GFP™1600 FPI (Flat Panel Illuminator).

Automotive Backlite Shear 45

Shear 45 image of an automotive backlite. The image above was acquired with the GFP™1600 FPI (Flat Panel Illuminator).

Automotive Backlite Shear 0

Shear 0 image of an automotive backlite. The image above was acquired with the GFP™1600 FPI (Flat Panel Illuminator).

Automotive Backlite Shear Max

Automotive backlite Shear Max image acquired with the GFP™1600 FPI. The GFP1600 FPI is idea for measuring stress in large glass samples.

Tinted Tempered Backlite

Area stress of tinted tempered backlite. Image acquired with the GFP™1600 FPI—an ideal tool for measuring stress in large glass samples.
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Sidelite / Backlite Thermal Stress

Sidelite / Backlite Thermal Stress

For thermal stress, the GFP 1600 FPI (Flat Panel Illuminator) is quick enough to monitor slower transient thermal stress events like those induced by window defrosters and wiper heaters. The system can be equipped with any c-mount lens, including zoom lenses, to conveniently image broad areas and/or close-up details. The temper pattern can be removed during processing to isolate the thermal stress, showing only the change.

For faster thermal transients, the GFP2600 real-time inspection system can be used to acquire stress videos. The GFP2600 is small and nimble, but the integrated fixed focal length lens requires more setup changes to acquire a range of field-of-views.

Automotive Backlite Defroster

An interrogable thermal stress image has been extracted from live video for analysis. Shear 0 stress not directly affected by thermal stress state. Difference of cool/heated conditions to see change in stress state. Temper pattern removed.

Automotive Backlite Defroster

An interrogable thermal stress image has been extracted from live video for analysis. Shear 45 stress not directly affected by thermal stress state. Difference of cool/heated conditions to see change in stress state. Temper pattern removed.

Automotive Backlite Defroster

Thermal stresses of a backlite defroster – Shear 45. Compression under defroster trace, tension in-between superimposed with broad developing thermal stresses. Difference of cool and heated conditions. Temper pattern removed.

Automotive Backlite Defroster

Thermal stresses of a backlite defroster – Shear 0. Effects of traces not as present in this stress direction, but broad developing thermal stresses are. Difference of cool and heated conditions. Temper pattern removed.
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Sidelite / Backlite Assembly Stress

Sidelite / Backlite Assembly Stress

Some assembly stress work can be accomplished by viewing the changes in stress in the glass; however, often it’s important to know the stress changes on the outside surface caused by bending. The GFP1600, combined with simple glue on sheet coatings and a camera jig, is an ideal tool for measuring assembly stress. Sheet coatings are easy to apply, and the glass stand accurately positions the system over the coating, without fuss.

Backlite Assebmly Stress

Stresses induced at assembly measured by placing strain sensitive coatings around components of a factory assembled unit. When the components are removed, factory assembly strain is released and visible in the coating.

Backlite Hinge Assembly

The full-field stress image above shows the assembly stress as seen around a bolted hinge on an automotive backlite lift gate. The curved glass is deformed as it conforms to the similarly curved hinge assembly.

Backlite Button Mount Assembly

The full-field stress image above shows the stress as seen around a lift gate shock connector (lift gate strut). The lift-gate shock connector is secured into a drilled hole near the edge of the backlite.

Button Assembly - Button Side

The full-field stress image above shows the stress as seen around a lift gate shock connector (lift gate strut) on the button side. The lift-gate shock connector is secured into a drilled hole near the edge of the backlite.

Button Assembly - Mount Side

The full-field stress image above shows the stress as seen around a lift gate shock connector (lift gate strut) on the mount side. The lift-gate shock connector is secured into a drilled hole near the edge of the backlite.
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Need help? Email our expert support team via our contact form or call us at +1 (608) 224-1230

Need help? Email our support
team via our contact form
or call us at +1 (608) 224-1230

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