Distribution-type optical-fiber Raman temperature sensor adopting circulating pulse coding and decoding and Rayleigh demodulation
A distributed optical fiber and temperature sensor technology, applied in the direction of physical/chemical change thermometers, thermometers, instruments, etc., can solve the problems of low transmission loss of single-mode optical fiber, large bending loss of single-mode optical fiber, and influence of temperature detection, etc., to achieve Effects of improved signal-to-noise ratio, low transmission loss, and increased peak power
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[0018] Further illustrate the present invention below in conjunction with accompanying drawing.
[0019] refer to figure 1, a distributed optical fiber Raman temperature sensor pulsed fiber laser 19 using cyclic pulse code decoding and Rayleigh demodulation, an acousto-optic modulator 20, an integrated optical fiber wavelength division multiplexer 11 with four ports, two photoelectric receiving amplifiers Modules 12 and 13, codec and demodulation digital signal processor 14, optical fiber temperature sampling loop 17, intrinsic temperature measuring optical fiber 18, digital temperature detector 16 and PC 15, output end of pulsed fiber laser 19 and acousto-optic An input end of the modulator 20 is connected, the output end of the acousto-optic modulator 20 is connected with the input port of the integrated optical fiber wavelength division multiplexer 11, and the first output port of the integrated optical fiber wavelength division multiplexer 11 is connected with the fiber te...
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