Distributed fiber optic temperature sensor and method for eliminating nonlinear error of the sensor
A technology of temperature sensor and distributed optical fiber, which is applied in the field of optical fiber temperature sensor and its elimination of nonlinear error of the sensor, distributed optical fiber temperature sensor and its elimination of nonlinear error of the sensor, can solve the problem of high measurement accuracy of the system, and achieve response Fast, simple operation and high measurement accuracy
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Embodiment 1
[0055] This embodiment provides a distributed optical fiber temperature sensor with a structure such as figure 1 As shown, it mainly includes the casing 12 and the optical fiber laser of the MOPA structure which is arranged in the casing 12 and connected sequentially with a wavelength of 1550.12nm, a pulse width of 10ns, a peak power of 15W, and a repetition period of 152us as the pulse laser source 1. , a wavelength division multiplexer 2 and an optical switch 3, an optical fiber box 4 made of aluminum alloy is also connected to the optical switch 3, a reference optical fiber ring 5 with a length of 20m and a winding diameter of 15m is arranged in the optical fiber box 4, the optical fiber box 4 is also provided with a dedicated temperature measuring chip DS18B20 integrated with the reference optical fiber ring 5 as the temperature probe 6, and the tail end of the reference optical fiber ring 5 is connected to the external 50 / 125um multimode fiber optic connection;
[0056...
Embodiment 2
[0059] This embodiment provides a method for eliminating the nonlinear error of the distributed optical fiber temperature sensor in Embodiment 1, which uses the method of compensating for the loss difference in sections to eliminate the difference in Raman Stokes and anti-Stokes optical loss. The nonlinear error of , the specific steps are as follows:
[0060] (1) Utilize photodetection module 9 in the distributed temperature sensor to detect the power of Stokes light and anti-Stokes light and record it, and the expressions of Stokes light and anti-Stokes light power are as follows:
[0061] P s = P 0 · K s · S b · v s 4 · R s ( T ) · e - ( α 0 ...
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