The distributed optical fiber temperature sensor is set up by using the technique of optic
time-domain reflection (OTDR) to get temperature information, and the way of getting the mean
by the accumulating time-domain signal to improve the ratio of signal to noise. Base on the
theory of Optical Time Domain Reflectometer, Raman scattering distributed optical fiber system
for Multi-point temperature measurement is established. A new demodulation method is proposed,
that is circulation demodulation method. The OTDR temperature curve of the next point to be
measured is demodulated by the current OTDR temperature curve. The experiment validated that
the theoretical analysis is correct, and the system can inhibit the calculation of temperature noise
and prevent Rayleigh back scattering light from harassing anti-Stokes back scattering light. The
spatial resolving power is less than 3m, the temperature resolving power is about ±3°C, and time
resolving power is not more than 3min.
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