Method and apparatus for correcting the error of a position meas

Details Method and apparatus for correcting the error of a position meas Method and apparatus for correcting the error of a position meas

1978-09-28

1980-08-05

Corbin, John K.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356351, G01B 1102

Patent

active

042159385

ABSTRACT:
Apparatus for correcting the error of a position measuring apparatus, the apparatus having a first measuring interferometer path of variable length and a second interferometer monitoring path of fixed length. Means are provided for monitoring the change in the optical path length of the monitoring interferometer due to environmental changes and for reflecting these changes in the indicated measurement of the measuring interferometer.

REFERENCES:
patent: 3458259 (1969-07-01), Bagley et al.
patent: 3647302 (1972-03-01), Zipin et al.
patent: 3656853 (1972-04-01), Bagley et al.

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