Optics: measuring and testing – Refraction testing – Prism engaging specimen
Patent
1975-09-10
1977-03-29
Corbin, John K.
Optics: measuring and testing
Refraction testing
Prism engaging specimen
73 16, 73 88A, 356 32, 356111, G01B 902
Patent
active
040146138
ABSTRACT:
The method of determining the change in the spacing between two positions on a single object or a position on each of two objects, by affixing two linear scatterers at the two positions; illuminating the scatterers with coherent monochromatic light from a source such as a He-Ne laser and obtaining an indication of the relative movement from changes in the interference pattern.
In one apparatus, linear scatterers are positioned on opposite sides of an adhesive in a lap joint. The scatterers are illuminated with light from a He-Ne laser to produce an interference pattern on a screen. Movement of a preselected fringe on the screen will provide an indication of strain in the adhesive lap joint.
In another apparatus, fibers are attached to the ends of a standard bar specimen and a test bar specimen which are placed in a furnace. The fibers are then illuminated with light from a helium neon laser to produce an interference pattern. A slit in a mask is positioned at a predetermined angle with respect to the zero order fringe. A photodetector is placed behind the mask. The output of the photodetector is displayed on a strip chart recorder together with a temperature signal.
REFERENCES:
patent: 3884581 (1975-05-01), Pryor
Hollenberg Glenn W.
Sharpe, Jr. William N.
Corbin John K.
Killoren Richard J.
Koren Matthew W.
Rusz Joseph E.
The United States of America as represented by the Secretary of
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