Fiber-optic luminescence sensor utilizing interference in a thin

Details Fiber-optic luminescence sensor utilizing interference in a thin Fiber-optic luminescence sensor utilizing interference in a thin

1983-11-21

1986-04-08

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231P, 350 9629, 73705, G01D 530, G01L 708

Patent

active

045815305

ABSTRACT:
A fiber-optic sensor for measuring a physical quantity or sensing changes therein, consists of a transmitter and receiver unit respectively arranged to transmit and receive optical energy and an optical fiber for transmission of said optical energy to and from a sensor located at the measurement point. The sensor has at least one solid body, which is arranged to emit photoluminescent optical energy in at least one wavelength range, and a volume limited by at least two substantially plane-parallel surfaces, the separation of which is smaller than half the coherence length for either the transmitted or luminescent optical energy, whereby an interference pattern will differently affect the transmission of optical energy to the receiver unit as the optical length between said parallel surfaces changes with changes in the physical quantity being sensed.

REFERENCES:
patent: 3580082 (1971-05-01), Strack
patent: 4322979 (1982-04-01), Fromm
patent: 4451730 (1984-05-01), Brogardh et al.

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