Moving state detection apparatus

Details Moving state detection apparatus Moving state detection apparatus

1986-06-30

1989-05-09

Willis, Davis L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

250231SE, 250237G, G01B 902

Patent

active

048293423

ABSTRACT:
There is disclosed a moving state detection apparatus comprising optical unit for superposing a light beam of a specific order diffracted by a diffraction grating with a nondiffracted reference light beam; and light-receiving unit for receiving the superposed light beam from the optical means, the light-receiving unit being adapted to detect a change in contrast of interference fringes upon movement of said diffraction grating, and detect a moving state of the diffraction grating.

REFERENCES:
patent: 3601490 (1971-08-01), Erickson
patent: 4436424 (1984-03-01), Bunkenburg
patent: 4676645 (1987-06-01), Taniguchi et al.

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