Optical fiber multipoint measuring device with time multiplexing
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United States of America Patent
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Aug 29, 1989
Grant Date -
N/A
app pub date -
Jun 1, 1987
filing date -
May 30, 1986
priority date (Note) -
Expired
status (Latency Note)
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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.
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