Body position sensor by phase comparison of modulated light wave

Details Body position sensor by phase comparison of modulated light wave Body position sensor by phase comparison of modulated light wave

1990-08-21

1991-03-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356 5, 25022723, H01J 516, G01C 308

Patent

active

050013386

ABSTRACT:
An optical position sensor for indicating the position of a movable body with respect to a reference point. A first optical signal at one wavelength and a second optical signal at a different wavelength, both modulated at a radio frequency, are transmitted through an optical fiber to the reference point at which a semi-reflecting mirror which passes the first signal and reflects the second signal is disposed. The first signal is reflected by the body into the optical fiber, and a phase comparator coupled to the fiber compares the phases of the modulating signals on the reflected first signal and the reflected second signal to determine the position of the body relative to the mirror.

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