The DeltaTherm Thermoelastic Stress Measurement System and the Grey-field Polariscope Photoelastic Strain Measurement System, as well as our array of glass inspection products, are used for a wide range of applications.

The list on the left illustrates a sampling of the proven uses, industrial applications and research capabilities of the instruments.

If you have an application that you would like us to investigate please contact us.
For glass inspection products please visit www.glassphotonics.com.
Edge compression of a windshield.

The Edge Master™ is a photoelastic stress analysis system optimized for measuring edge stresses in clear or tinted glass—with or without black paint. The system works on windshields, sidelights, and backlights. Learn more about the Edge Master, as well as other glass inspection products by Stress Photonics, at www.glassphotonics.com.
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Real-time Photoelasticity!


Spoke of sports car
wheel in cyclic cornering
load simulation.
Both the DeltaTherm thermoelastic and GFP photoelastic systems can measure load induces stresses.

DeltaTherm – The specimen is prepared with flat black paint and loaded cyclically to simulate the load level. The system measures the small changes in temperatures induced by the thermoelastic effect to create an image of the stress distribution.

GFP 1200 – A thin coating is applied with a special brush and the object is loaded statically or dynamically. The ability of the GFP system to accommodate static loading allows for much simpler loading mechanisms including the use of dead weights or hand jacks.

Stresses in inner door panel caused by window motor mass in door slam.
Both the DeltaTherm thermoelastic and GFP photoelastic systems can measure dynamic stresses.

DeltaTherm – The specimen is prepared with flat black paint and simply viewed with the infrared camera. The system measures the small changes in temperatures caused by the dynamic or vibrational deformation of structure after a transient loading.

GFP 1200 – A thin coating is applied with a special brush. The transient state of stress is frozen at an instant or a vibrational phase via a strobe light.

Stresses in plumbing cover plate caused by tightening fastener.
The GFP photoelastic system is ideal for measuring assembly stresses. A thin coating is applied with a special brush the components are assembled and viewed for stress.

Alternatively an assembled structure can be coated and taken apart. Upon removal of a component from the structure the negative assembly strains will be experienced.

Crack in a steel plate
found with Coating Tolerant Thermography.
The technology used for flaw detection is very case specific. Cracks or disbonds can be detected using thermal methods while flaws in translucent objects can be detected using a GFP photoelastic system.

Stress Photonics has implemented a number of common thermal NDE techniques in the DeltaTherm product. In addition, Stress Photonics has invented and co-developed special thermal NDE techniques for crack and flaw detection.

Please contact a Stress Photonics representative to discuss your requirements.

Residual stress of a
compact disk (CD) blank.
The GFP Photoelastic Strain Measurement System can measure residual stresses in clear or translucent materials directly with no specimen preparation. Metallic and opaque objects can be handled in the traditional way by coating and then cutting to relieve the residual stresses.

The real-time output of the GFP 2000 has a specific and comprehensive adaptation for on-line monitoring of manufacturing processes. In the case of glass manufacture continuous monitoring of the residual stress along the edge of glass products provides 100% inspection capability.

Fuel injector control valve.
(Image size 6mm x 4mm)
Stress Photonics offers a two-position zoom lens that can be used on cameras with bayonet lens mounts. Magnification of 2.2x results in a per pixel resolution better than 15 µm. The unique design of the lens makes it a cost-effective solution for characterizing small structures.

Axial vibration of plastic radiator fan for finite element verification.
Both DeltaTherm thermoelastic and GFP photoelastic systems can measure vibrational stresses.

DeltaTherm – The specimen is prepared with flat black paint and simply viewed with the infrared camera. The system measures the small dynamic changes in temperatures caused by the thermoelastic effect to create an image of the stress distribution.

GFP 1200 – A thin coating is applied with a special brush. The vibrating component is viewed with a strobe light to measure the stresses in a particular phase.