Stress Measurements in Glass Using Double Thermal Gratings Bret D. Cannon, Chester Shepard, and Mohammad Khaleel Pacific Northwest National Laboratory, Richland, Washington 99352 Abstract. We developed a non-destructive and non-contact method for measuring stress at the mid-plane of tempered glass plates that uses Bragg scattering from a pair of thermal gratings. These gratings are formed by 1064 nm beams from a seeded Nd: YAG laser and we measure the polarization state of light from a 532 nm beam that scatters from both these thermal gratings. The change in polarization of the doubly scattered light with separation between the two gratings allows measurement of the in-plane stress. A model of the Bragg scattering efficiency, experimental investigations of the scattered beams, and stress measurements are reported. OCIS Codes: 050.7330, 120.4290, 120.3930
Revised: November 13, 2001 |
Published: October 20, 2001
Citation
Cannon B.D., C.L. Shepard, and M.A. Khaleel. 2001.Stress Measurements in Glass by Use of Double Thermal Gratings.Applied Optics 40, no. 30:5354-5369.PNNL-SA-33727.