Optical instrument for measuring displacement

Details Optical instrument for measuring displacement Optical instrument for measuring displacement

1984-11-05

1987-06-30

Willis, Davis L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

250237G, 356363, G01B 902

Patent

active

046766456

ABSTRACT:
Optical instrument for measuring displacement comprising a movable diffraction grating used as a scale, a semiconductor laser device, photodetectors, and means for making two light beams diffracted by the diffraction grating interfere with each other in which displacement of said diffraction grating is measured, based on variations of interference signals. The laser device has a suitable coherency for making selectively two necessary light beams with equal optical path lengths interfere with each other.

REFERENCES:
patent: 3738753 (1973-06-01), Huntley, Jr.
patent: 3756723 (1973-09-01), Hock

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