System for measuring distance between two points using a variabl

Optics: measuring and testing – By particle light scattering – With photocell detection

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356345, 356352, 356 409, G01B 902

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054124743

ABSTRACT:
An interferometric gauge for high precision absolute and incremental measurements of distances of up to at least 100 meters. An accuracy of 0.02 Angstrom has been demonstrated, free of the .about.10 Angstrom polarization-leakage errors of conventional gauges. The absolute distance measurement requires no a priori information, and multiple synthetic wavelengths need not be used. The gauge can be used as the sensor for a null servo. There are reduced-cost versions of lower accuracy. The gauge can employ a resonant cavity for greater sensitivity, and can be built with no transmissive elements in the measured path. Without additional hardware, the gauge readout can be in the form of a frequency or an analog electrical signal, in addition to a digital count of an integral number of wavelengths. The gauge employs a high-sensitivity null sensor. Feedback to an optical frequency shifter maintains the null condition; the frequency shift is measured electronically, providing a high sensitivity distance readout. The gauge keeps track of the whole and fractional number of the optical waves travelled. Absolute distance measurement is based on free spectral range determination, employing the high sensitivity and freedom from polarization leakage of this design.

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