Resolution system for interferometer

Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer

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377 17, 377 42, 377 43, 377 53, G01B 902

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045838569

ABSTRACT:
Analog-to-digital conversion and a computer produce finer resolution for interferometer distance measurement. The system applies to a laser interferometer producing two detected signals with voltages 19 and 20 that vary to form two sine waves in quadrature as interference fringes occur. A pair of analog-to-digital converters 21 and 22 converts each of these signals into digital values subdividing each sine wave fringe cycle into a plurality of increments. An up/down counter 25 supplied with a significant digit from each of the converters counts fringes corresponding to changes in path lengths. A computer 30 arranged with access to the fringe count and the digital increments determines a distance measurement based on the fringe count and a fine resolution of the distance measurement based on final values of the signals at any subdivided fringe cycle increments after changes in the path lengths.

REFERENCES:
patent: 3564218 (1971-02-01), Lay
patent: 3627996 (1971-12-01), Vigour
patent: 3661464 (1972-05-01), Hubbard
patent: 3794814 (1974-02-01), Lay et al.
patent: 3976379 (1976-08-01), Morokuma
Courselle, "Electronic Fringe Counter", IBM Tech. Discl. Bull., vol. 9, No. 3, pp. 269-271, Aug. 1966.

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