Interferometric load sensor and strain gage

Details Interferometric load sensor and strain gage Interferometric load sensor and strain gage

1986-07-03

1989-03-28

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356352, 356 355, G01B 902

Patent

active

048158550

ABSTRACT:
The invention comprises an interferometric load sensor, or force balance 10 which utilizes etalons 12, 14 to form a reflective cavity 16. A fringe pattern is formed in cavity 16 by light from laser source 26. One of the etalons (14) is mounted to a section 20 that is sensitive to the application of a force 22. Flexing of cantilever 24 due to application of force 22 on section 20 changes the air gap wedge angle between the etalons 12, 14 and thereby shifts the fringe field formed in cavity 16. The shift in the fringe field is observed by light detectors 30, 32.

REFERENCES:
patent: 2312888 (1943-03-01), Everest
patent: 3635562 (1972-01-01), Catherin
patent: 4286879 (1981-09-01), Jager et al.
patent: 4436419 (1984-03-01), Stetson et al.
patent: 4526465 (1985-07-01), Corti et al.
patent: 4533247 (1985-08-01), Epworth

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