Distributed optical fiber temperature sensor system

The distributed optical fiber temperature sensor is a kind of temperature-measuring equipment. It includes laser generator, optical fiber with bidirectional coupler, light wave-division multiplexer (WDM), two light avalanche transistor, two amplifiers, signal-sampling cara and computer. The generated laser pulse enters the fiber-optical to output back dispersion light whose echo channel has two paths; one path as Raman back dispersion light separated by the light WDM enters one avalanche transistor and the other path as Rayleigh back dispersion light enters the other end. Two avalanche transistor make the photoelectric conversion, and the output signals apart enter the amplifier whose output end linked with the input end of the signal-sampling card whose output end linked with the computer.