A Method to Solve Temperature Drift of Distributed Optical Fiber Raman Temperature Sensing System
A distributed optical fiber, sensing system technology, applied in thermometers, thermometers with physical/chemical changes, measuring devices, etc., can solve the problems of inability to exclude the influence of system stability, sacrificing system flexibility, poor dynamic response speed, etc. , to achieve the effect of low power consumption, improved temperature measurement accuracy, and fast dynamic response speed
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[0031] The specific implementation of a method for solving the temperature drift of a distributed optical fiber Raman temperature sensing system can be mainly divided into system device design, temperature demodulation formula calibration, implementation of dynamic sampling correction method, and signal denoising.
[0032] 1. System device design
[0033](1) The pulsed laser light source is driven by a high-speed pulse drive circuit, the output power of the light source is stabilized by the automatic power control circuit according to the LD back optical power value, and the LD operating temperature is maintained by the automatic temperature control circuit. The optical power and pulse width of the pulsed laser light source And the repetition frequency is adjustable, the adjustable range of the optical power is 0mW-10mW, the adjustable range of the pulse width is 5ns-1000ns, and the adjustable range of the repetition frequency is 1KHz-10KHz. The light is output through the iso...
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