Polariscope and filter therefor

Details Polariscope and filter therefor Polariscope and filter therefor

1979-05-14

1981-09-01

Punter, William H.

Optics: measuring and testing

Range or remote distance finding

With photodetection

350408, 356 33, 356 35, G02B 530, G02B 2728

Patent

active

042868432

ABSTRACT:
The filter comprises a multiplicity of light polarizing elements which polarize light in a plurality of planes, and a multiplicity of filtering means associated with the light polarizing elements. In a polariscope, light is directed from a source through such a filter to the specimen to be analyzed. Light passed through the specimen once or twice is coupled through another such filter termed an analyzer. In certain embodiments, the polarizer and the analyzer are combined. Patterns representing the stress in the specimen are produced. The pattern includes isochromatics and a number of isoclinics.

REFERENCES:
patent: 2309626 (1943-02-01), Conrad
patent: 2493200 (1950-01-01), Land
patent: 2720553 (1955-10-01), Toulon
patent: 3054204 (1962-09-01), Yates
patent: 3544193 (1970-12-01), Laput
patent: 4158506 (1979-06-01), Collett
patent: 4171908 (1979-10-01), Robert et al.
Redner, S., "New Automatic Polariscope System", Exp. Mech. (U.S.A.), vol. 14 #12, 12-1974, pp. 486-491.
Zandman et al., "Photoelastic Coatings", Joint Publication, Iowa State U. Press & Soc. For Exp. Stress Analysis, pp. 7-30.

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