Method and apparatus for interference fringe center sensing

Details Method and apparatus for interference fringe center sensing Method and apparatus for interference fringe center sensing

1978-04-21

1979-10-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Interference pattern analysis

356345, 358107, G02B 2738

Patent

active

041699807

ABSTRACT:
An electro-optical sensor is described which provides an output for precisely locating the centers of interference fringes in either a real-time interference pattern or an interferogram. By scanning the fringe pattern either by moving the fringe pattern, by effectively moving the photoelectric sensor, or both, the centers of the fringes can be rapidly and precisely determined from the first derive of the output of the photodetector.

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patent: 3694088 (1972-09-01), Gallagher et al.
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patent: 3967054 (1976-06-01), Walton
patent: 3967903 (1976-07-01), Enami et al.
patent: 3980870 (1976-09-01), Kawahara
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"A Method for the Precise Evaluation of Interferograms", G. D. Dew, J. Sci. Instr., vol. 41, pp. 160-162 (1964).
"An Automated Interferogram Technique", Jones et al., App. Optics, vol. 7, pp. 1477-1482 (1968).
"Analysis of Interferograms", R. Berggren, Optical Spectra, pp. 22-25 (1970, Dec.).
IBM Tech. Disclosure Bulletin, vol. 20, No. 1, Jun. 1977, pp. 206-214.
"Interferometry", C. Zanoni, The Optical Industry and Systems Directory Encyclopedia, vol. 2, pp. E137-E141 (1977).

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