Apparatus for automatic measurement of stress in a transparent b

Details Apparatus for automatic measurement of stress in a transparent b Apparatus for automatic measurement of stress in a transparent b

1985-02-05

1987-04-07

Willis, Davis L.

Optics: measuring and testing

Material strain analysis

With polarized light

356365, 356367, G01N 2123, G01L 124

Patent

active

046555897

ABSTRACT:
An apparatus used directly on a flat sheet of transparent material, especially tempered glass, for simultaneous measurement of sign and amplitude of stress across the section of said glass sheet using scattered light. The apparatus allows reliable and repetitive measurements independently of the operator's subjective observations, since the data is read through an automatic system. The apparatus has a Helium-Neon (He-Ne) laser source of 1 to 5 mW, whose light beam is linearly polarized, then modulated with a series of wave plates (2,2', 2"), then passed through a collimator (3) and subsequently made to strike a prism (4) optically coupled with the glass sheet (V) being tested. Variation in intensity of the interference fringes is revealed by a TV camera (5) having a macrophotographic lens system (5') which focusses the scattered light on a solid-state array photodetector (5'). The photosensitive zone of the detector is positioned to detect intensity of the scattered light along path (BC) of the laser beam through the section of the glass sheet (V). An electronic circuit can thus convert the video signals transmitted by TV camera ( 5).

REFERENCES:
patent: 3811775 (1974-05-01), Abu-Saud
patent: 4192610 (1980-03-01), Paraskevas
Mazurkiewicz et al., "Integrated-Plane Photoelastic Method Application of Photo Elastic Isodynes", Eaptl. Mech., V. 19, No. 7, pp. 225-234, Jul. 1979.
Kishii, "Laser Biascope for Surface Stress Measurement of Tempered Glasses", Opt. and Laser Tech., vol. 13, No. 5, pp. 261-264, Oct. 1981.

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