Fringe counting interferometric system for high accuracy measure

Details Fringe counting interferometric system for high accuracy measure Fringe counting interferometric system for high accuracy measure

1977-08-26

1979-08-21

Corbin, John K.

Optics: measuring and testing

By particle light scattering

With photocell detection

356349, G01B 902

Patent

active

041651839

ABSTRACT:
A fringe counting interferometric method and apparatus is disclosed. The aratus comprises a fringe-counting Michelson interferometer employing a velocity-stable carriage means for translating the two corner-cube retroreflectors, two phase locked oscillators and counting and control circuitry. Fringe intensity signals are counted for both a reference and unknown beam, and high accuracy is obtained by multiplying reference beam fringe signals by a fixed integral multiplier employing a phase-lock circuit. In comparing the unknown wavelength with the reference, the convenience of direct readout in wavelength units arises from the use of a high resolution preset counter.

REFERENCES:
patent: 4052129 (1977-10-01), Schawlow et al.

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