Distance measuring interferometer having specific crossings dete

Details Distance measuring interferometer having specific crossings dete Distance measuring interferometer having specific crossings dete

1995-03-03

1996-07-09

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356345, G01B 902

Patent

active

055350046

ABSTRACT:
The distance-measuring apparatus utilizes an interferometric technique to measure the distance to a light-reflecting surface. A laser-generated plane wave is split by a beam splitter into first and second plane waves. The first plane wave is directed to the reflecting surface which reflects it back to the beam splitter. The second plane wave is directed to a reference mirror which reflects it back to the beam splitter where it combines with the reflected first plane wave to form a combination plane wave. The combination plane wave is caused to vary periodically in amplitude by modulating the position of the reference mirror. Changes in the distance to the reflecting surface are obtained by electronically processing the changes in the power of the combination plane wave.

REFERENCES:
patent: 3409375 (1968-11-01), Hubbard
patent: 3572935 (1971-03-01), Howell et al.

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