Optical apparatus for measuring displacement of an object

Details Optical apparatus for measuring displacement of an object Optical apparatus for measuring displacement of an object

1989-04-06

1991-11-26

Willis, Davis L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

250225, 356356, G01B 902

Patent

active

050678132

ABSTRACT:
Disclosed is an optical apparatus which can be used for measuring displacement of an object. The apparatus includes an optical system for forming a linearly polarized beam whose polarization direction changes, a reflecting surface for reflecting the beam and for directing the beam in a predetermined direction, a photoelectric converter for photoelectrically converting a reflected beam directed in the predetermined direction, a polarizing device, arranged in an optical path of the reflected beam, for directing only a P-polarized beam or an S-polarized beam of the reflected beam toward the photoelectric converter.

REFERENCES:
patent: 4676645 (1987-06-01), Taniguchi et al.
patent: 4829342 (1989-05-01), Nishimura

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