Fiber optic distributed temperature sensor system

Details Fiber optic distributed temperature sensor system Fiber optic distributed temperature sensor system

1990-06-22

1992-05-12

Kuntz, Curtis

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

H04J 1402

Patent

active

051132770

ABSTRACT:
A fiber optic distributed temperature sensor system outputs a temperature distribution along the longitudinal direction of a sensor optical fiber by measuring the temperature dependency of Raman scattered light intensity produced in an optical fiber by use of the OTDR technique. The system is characterized in that a light output from a light source is input to the sensor (optical fiber) via an optical wavelength division demultiplexer, that among the reflected light of back scattered light returning from the sensor optical fiber, light of a particular wavelength range is reflected or transmitted by at least one optical filter of the optical wavelength division demultiplexer to separate the light of the particular wavelength range and that signal of the light of the particular wavelength range is guided to a detector of an optical measuring system.

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