Dynamic photoelasticimeter with rotating birefringent element

Details Dynamic photoelasticimeter with rotating birefringent element Dynamic photoelasticimeter with rotating birefringent element

1978-02-14

1979-12-18

Corbin, John K.

Optics: measuring and testing

Material strain analysis

With polarized light

356365, G01J 404, G01L 124

Patent

active

041792173

ABSTRACT:
This invention relates to a dynamic photoelasticimeter with a rotating birefringent element. It comprises a laser, a birefringent plate rotatable at a constant speed, a model to be studied, a circular analyzer and a photodetector supplying signals at its output having frequency components of 2.omega. and 4.omega.. The ratio of the amplitudes of these signals supplies an indication of the phase shift .phi. (t) contributed by the model, and the phase of the signal of the frequency 4.omega. contributes information as to the orientation .theta. of the axes of the model at the point in question.
The present invention provides a particularly simple and accurate dynamic photoelasticimeter.

REFERENCES:
patent: 3738755 (1973-06-01), Chaney et al.
patent: 3740151 (1973-06-01), Chaney et al.
patent: 3902805 (1975-09-01), Redner
patent: 3927947 (1975-12-01), Kasai
patent: 3988067 (1976-10-01), Yamamoto et al.
Redner S., "New Automatic Polariscope System"; Experimental Mechanics vol. 4, No. 12, Dec. 1974, pp. 486-491.

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