Since 1988

Stress Photonics uses innovative photoelastic methods to offer a full line of automated, easy-to-use, full-field glass inspection instruments.

Stress Photonics was founded in 1988 as a spinoff of the University of Wisconsin by Professor Bela Sandor and Stress Photonics president Jon Lesniak. Having been an industry mentor to the group, Brad Boyce became a partner shortly thereafter. With Lesniak’s special skills in math and science and Boyce’s electronics and software expertise, Stress Photonics quickly rose to become a world-class leader in engineering measurements of stress and strain.

Through a NASA SBIR grant, Stress Photonics integrated innovative concepts, military grade IR technology, and high-speed image processing to introduce a revolutionary full-field Thermoelastic Stress Analysis instrument, the DeltaTherm™ 1000. In 1994, DeltaTherm was selected to receive the coveted R&D 100 Award.


Stress Photonics then developed the GFP™1000 (Grey-Field Polariscope), the first fully automated commercial Photoelastic Stress Analysis system. The GFP1000 quickly found a home in automotive glass assessment. The GFP systems measure residual stress in glass or applied stress in engineering materials and structures.


The need for speed led to the real-time GFP™2000, and to the industry standard EdgeMaster Windshield Stress Measurement System, which performs quick and efficient edge stress measurements.


There is virtually no limit to the size of glass that can be inspected with a GFP system. From microscopic measurements of anodic-bonded Si/glass, to measurements of mammoth sheets of architectural glass and full automotive windshields, our inspection tools and our team of experts are ready to handle the most challenging applications. With stress measurement tools from Stress Photonics, the answer is clear.™

In Partnership with NASA

In the space shuttle orbiter era, Stress Photonics was called on to develop an HVI (Hypervelocity Impact) inspection system to measure damage to orbiter windshields.

Click on the photo to see a video of one of our GFP systems in action inspecting a space shuttle orbiter windshield at NASA's Kennedy Space Center.

Click here to view stress images from the orbiter windshield inspection.


Jon Lesniak

Jon R. Lesniak, Founder, President & CEO, co-founded Stress Photonics while studying at the University of Wisconsin, where, in 1991, he received his master’s degree in Engineering Mechanics. Jon was awarded the Kurt F. Wendt Memorial Scholarship for outstanding performance as a UW engineering student.

Jon is the lead product developer and holds numerous patents in the areas of thermal and optical methods. He has been principal investigator for many commercial and government contracts. The Stress Photonics product lines were the result of his innovation and leadership in two hallmark contracts: DeltaTherm Stress Measurement System (NASA 1991–94, US Air Force 1993–97 ) and the Grey-Field Polariscope Strain Measurement System (NASA 1997–99).

Jon has authored numerous scientific papers and was given the Andronicos G. Kantsios Award for a paper presented at SPIE Thermosense XIX. In 2005, in recognition of his outstanding work in the field of photoelasticity, Jon received the Felix Zandman award from the Society of Experimental Mechanics.

Brad Boyce

Brad attended the University of Wisconsin and completed a master’s in Engineering Mechanics in 1978. 

Prior to joining Stress Photonics, Brad worked as a test engineer at John Deere Horicon Works where his responsibilities included the installation and implementation of new technologies to aid in product design and development. In the mid-1980s he developed instrumentation and software for Thermoelastic Stress Analysis that would later become one of the building blocks of Stress Photonics.

Brad has been active in the Society for Experimental Mechanics (SEM) since 1973. He has served as local section chairman and as chairman of the Thermal Methods Division; served twice as a conference chairman; and served as a member of the board of directors of SEM. In 2000, SEM recognized Brad with the Brewer Award for outstanding practicing engineer. Over his engineering career Brad has authored a broad range of technical papers on topics in engineering measurement and instrumentation.

In Partnership with LiteSentry™

The Osprey 9 Complete by LiteSentry, developed in partnership with Stress Photonics, utilizes the GFP2600 Real-time Photoelastic Stress Analysis System, coupled with a STRIP Illuminator. (The combination is the GFP2600 STRIP.) The instrumentation provides 100% inspection, offering visualization and quantification of the most challenging problems in glass fabrication.

The system is designed for installation on any brand of tempering line, creating a paradigm shift in tempering.

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

Glass Photonics was founded by Stress Photonics Inc to better serve the glass industry.
All products are manufactured by Stress Photonics.

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