Optical fiber multipoint measuring device with time multiplexing

Details Optical fiber multipoint measuring device with time multiplexing Optical fiber multipoint measuring device with time multiplexing

1987-06-01

1989-08-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231R, H01J 516

Patent

active

048619795

ABSTRACT:
Twenty temperature sensors follow one another along a measurement fiber. Each successively reflects a small fraction of the energy of an interrogation light pulse running along said fiber, with the value of the fraction being indicative of temperature. To do this, each sensor is constitutred by a gap between two successive lengths (F2, F3) of an optical fiber, said gap being filled with a transparent glue (36) whose refractive index varies as a fuction of temperature. The interrogation pulse is returned solely by the optical surface constituted by the end face (38) of the upstream length (F2) of the fiber.

REFERENCES:
patent: 4409479 (1983-10-01), Lofgren et al.
patent: 4417140 (1983-11-01), Adolfsson et al.
patent: 4713538 (1987-12-01), Theocharous

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