Wavelength tracking compensator for an interferometer

Details Wavelength tracking compensator for an interferometer Wavelength tracking compensator for an interferometer

1987-03-20

1988-08-23

Willis, Davis L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01B 902

Patent

active

047657413

ABSTRACT:
A wavelength tracking compensator for a laser interferometer measurement system comprises a stable physical standard optical cavity and a double path, differential interferometer mounted on a baseplate. The interferometer monitors the apparent changes in the cavity's length caused by actual changes in the index of refraction of the surrounding air. The cavity is supported with a temperature compensated mount that utilizes the principle of differential thermal expansion of two different metals to create a mount which exactly matches the coefficient of expansion of the cavity material. A semi-kinematic mount supports the double path, differential interferometer and allows the interferometer to be accurately aligned to the cavity with three rotational degrees of freedom to prevent any cosine error in the cavity's optical path length measurement, to prevent polarization leakage, and to maximize optical power at the receiver. A phase measurement system interpolates between interference fringes to extend measurement resolution and provides absolute phase information relative to the fringes so that the measurement system can prevent measurement uncertainty caused by a beam interruption and recover from an interruption without re-initialization.

REFERENCES:
patent: 3519236 (1970-07-01), Schmidt et al.
patent: 4215938 (1980-08-01), Farrand et al.

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