Fiber optic speed sensing for a rotating shaft

Details Fiber optic speed sensing for a rotating shaft Fiber optic speed sensing for a rotating shaft

1988-02-26

1989-09-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231SE, 324175, G01D 534

Patent

active

048702706

ABSTRACT:
A method and apparatus for monitoring the rate of rotation of a turbine engine shaft during the operation of the engine. A chopper extends radially from the shaft. Infrared radiation is passed through an input optical fiber having a beveled end positioned adjacent to the chopper which chops the infrared radiation. The chopped infrared radiation passes into a beveled end of an output optical fiber which is positioned adjacent to the chopper. The rate of rotation of the shaft is detected by monitoring the chopped infrared radiation from the output optical fiber. Carbonaceous coatings are formed on the beveled ends of the optical fibers by deposition of oil and combustion products thereon. While these coatings are opaque to visible light, they are transparent to the infrared radiation used in accordance with the invention.

REFERENCES:
patent: 4278881 (1981-07-01), Mann
patent: 4471816 (1984-09-01), Wada
patent: 4524054 (1985-07-01), White
patent: 4580130 (1986-04-01), Tokunaga et al.
patent: 4638155 (1987-01-01), Dorr
patent: 4639595 (1987-01-01), Okita et al.
patent: 4746791 (1988-05-01), Forkel

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