Optical displacement transducer usable as an extensometer

Details Optical displacement transducer usable as an extensometer Optical displacement transducer usable as an extensometer

1985-11-13

1987-09-01

Laroche, Eugene R.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

35821311, G01L 124

Patent

active

046900012

ABSTRACT:
A non-contact, displacement transducer (optical extensometer), which is relatively simple to make and operate, and therefore low cost, utilizes 35 mm camera optics for the lens system and will focus a beam of light along a linear path of light sensitive elements representing a gauge length of a specimen or member. Flags or similar indicators that change the pattern of the light beam are mounted or marked on the specimen at two spaced loations. As the specimen is loaded, the flags will change in spacing, and, as shown, the change in the location of shadow will cause changes in the affected light sensitive elements which provide outputs that indicate displacement in the specimen. The sensing circuitry providing the output is compact and easily mounted within a module carrying the lens. The module may be mounted directly to a test specimen frame.

REFERENCES:
patent: 4574642 (1986-03-01), Fleischman
MTS Systems Corporation product brochure, Optical Extensometer, Product No. 926.44, 1983.
Appendix B Operation Manual, Digital Camera Operation, published 1983, (approximately).
Brochure "Image Sensing Systems By Reticon", published in 1979.

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