Actuator with an optical position sensor using linear attenuator

Details Actuator with an optical position sensor using linear attenuator Actuator with an optical position sensor using linear attenuator

1992-12-31

1994-07-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

25022721, 25023113, H01J 4014, G01D 534

Patent

active

053291140

ABSTRACT:
An actuator having an optical position sensor is disclosed. The sensor remotely provides via a single optic fiber light having two spectral frequencies of about equal intensities to two inversely acting linear optical attenuators. The attenuated light from each attenuator is filtered. The two attenuated light signals of the two frequencies are combined in another single optic fiber and then processed into voltages indicative of their intensities. The position of a moving object attached to the attenuators is derived from the two signals.

REFERENCES:
patent: 1985044 (1934-12-01), Lyle
patent: 3328595 (1967-06-01), Todd, Jr.
patent: 4320293 (1982-03-01), Guretzky
patent: 4977316 (1990-12-01), Malcolm et al.
patent: 5107846 (1992-04-01), Atlas
patent: 5210409 (1993-05-01), Rowe
G. E. Miller, ISA Transactions, vol. 26 No. 1, "Fiber Optic Control of Jet Aircraft Engines" pp. 11-17, 1987.

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