Hand held phase-shifting diffraction moire interferometer

Details Hand held phase-shifting diffraction moire interferometer Hand held phase-shifting diffraction moire interferometer

1993-03-18

1994-09-20

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356360, 356 355, 250237G, G01B 902

Patent

active

053494423

ABSTRACT:
An interferometer in which a coherent beam of light is generated within a remote case and transmitted to a hand held unit tethered to said remote case, said hand held unit having optical elements for directing a pair of mutually coherent collimated laser beams at a diffraction grating. Data from the secondary or diffracted beams are then transmitted to a separate video and data acquisition system for recording and analysis for load induced deformation or for identification purposes. Means are also provided for shifting the phase of one incident beam relative to the other incident beam and being controlled from within said remote case.

REFERENCES:
patent: 4153370 (1979-05-01), Corey
patent: 4322162 (1982-03-01), McKelvie et al.
patent: 4432239 (1984-02-01), Bykov
patent: 4850693 (1989-07-01), Deason et al.
Post, et al., "High Sensitivity Moire Interferometry-A Simplified Approach", Experimental Mechanics, Mar. 1981, pp. 100-104.

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