Optical train for measuring angle or position with transmission

Details Optical train for measuring angle or position with transmission Optical train for measuring angle or position with transmission

1990-03-13

1992-02-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25022723, 250226, 25023113, H01J 516, G01J 350

Patent

active

050878115

ABSTRACT:
A referenced optical chain for measuring angle or position, using transmission by optical fibers. The device comprises a measuring head (29) receiving two light waves transported by a supply optical fiber (28); at the measuring head (29), the incident light beams are collimated (33) then intercepted by an assembly comprising a fixed diaphragm (34) and a movable filter (35) intercepting one of the two light waves; this assembly constitutes the measuring system itself; the resultant light signals are then refocussed and coupled to an optical return fiber which transports the signals toward a photodetector. The measurement is linear and the measuring chain is referenced in all of the embodiments of the invention. The device may be used in any application which requires a measurement of angle or position.

REFERENCES:
patent: 4281245 (1981-07-01), Brogardh et al.
patent: 4356397 (1982-10-01), Lenderking et al.
patent: 4560272 (1985-12-01), Harris
patent: 4587513 (1986-05-01), Burrowes et al.
patent: 4652747 (1987-03-01), Ellis
patent: 4743119 (1988-05-01), Ida
patent: 4761551 (1988-08-01), Edwards et al.
patent: 4891510 (1990-01-01), Jones et al.
patent: 4947036 (1990-08-01), Pokorski et al.
"Fiber-Optic Angular Sensor with Interleaved Channel Spectra", Optics Letter, vol. 11, No. 8, Aug. 1986, by Ph. Dabkiewicz et al., pp. 543-545.
Schweizer et al., "Intrinsically Linear Wavelength Referenced Fiber Optic Absolute Angular Displacement Sensor", Proc. of Optical Fiber Congress, No. 7, 12/6, 1990.

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