Patent
Polariscope for determining stress in a transparent material
TLDR
In this paper, a polariscope is described for detecting stresses in a transparent object, and means for moving the transparent object in a direction transverse to the direction of the scanning light beam are provided.Abstract:
A polariscope is described for detecting stresses in a transparent object. The polariscope comprises means for producing a beam of polychromatic plane polarized light, a condensing lens, an aperture, a quarter-wave retardation plate, analyzing means and a photocell. Changes in stress cause changes in the color and intensity of the light detected. Means are provided for scanning the polychromatic light beam back and forth in one direction across the transparent object that is being studied. Means are also provided for moving the transparent object in a direction transverse to the direction of the scanning light beam. The output of the photocell is applied through an amplifier to a chart recorder in order to produce a plot of the stresses in the object with respect to their position.read more
Citations
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Patent
Full field photoelastic stress analysis
TL;DR: In this paper, a simple polariscope was constructed having two polarizing filters with a single one-quarter waveplate placed between the polarizing filter and the waveplate and reflected from a sub-fringe birefringent coating on a structure under load.
Patent
Field test unit for windscreen optical evaluation
Louis V. Genco,Harry L. Task +1 more
TL;DR: In this paper, a beam of light is projected along an optical axis onto a beam splitter, and the reflected segment passes through the transparent body and is then reflected back along nearly the same path toward the beam-splitter by a retroreflective screen lying at the image plane of the beam.
Patent
Apparatus for automatic measurement of stress in a transparent body by means of scattered light
Cestaro Massimo,Paudice Ciro +1 more
TL;DR: In this paper, an automatic system for simultaneous measurement of sign and amplitude of stress across a flat sheet of transparent material, especially tempered glass, using scattered light has been proposed, which allows reliable and repetitive measurements independently of the operator's subjective observations.
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Apparatus for detecting faults in transparent objects
TL;DR: In this article, a plane polarizing plate of a circular polarizer combined with a 1/4 wave plate is disposed at the side of a diffused light side, while an output electric signal of the photoelectric detector is subjected to analog operation processing.
Patent
Determination of tensile membrane stress and compressive layer thickness in tempered glass using a CO2 laser beam
TL;DR: In this article, a determination of the temper quality of a tempered glass sheet is made which includes determining the percentages of the thickness of a glass sheet which are in compression as well as the sheet's tensile membrane stress.
References
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Patent
Apparatus for measuring the thickness of thin transparent films
George T Hanyo,Thomas P Murray +1 more
Patent
Glass defect detection system
Bricker Jack A,Shaw Hugh E +1 more
TL;DR: In this paper, a glass-defect detection system consisting of a light source, a stationary disc, a scanning disc and a photomultiplier was presented. But the authors did not consider the effect of stress concentrations in the glass.