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Research on Enhanced Digital Signal Processing in Distributed Optical Fiber Sensors
Linyang Guo, Chunlin Xu and Zao Huang

The physical properties of optical fiber enable it to be used as a sensor to detect the distribution of temperature in space. This paper briefly introduced distributed optical fiber temperature sensor and time domain signal averaging technology used for enhancing digital signal. Then, the distributed optical fiber temperature sensor system was tested by constant temperature water bath box. The spatial resolution, temperature resolution and measurement time of the system under 150, 1500 and 15000 times of signals accumulation were compared. The results showed that time domain signal averaging technology could effectively suppress noise signals, and the more the signal accumulated, the better the suppression effect was and the clearer and smoother the temperature signal curve was; the spatial resolution and temperature resolution of the system increased with the increase of the number of accumulations, and tended to be flat, while the measuring time increased greatly with the increase of the number of accumulations. In conclusion, the time domain signal averaging technology can effectively enhance the weak temperature signal in the optical fiber sensor, but the signal accumulation times need to be set according to the actual measurement accuracy and efficiency.

Keywords: optical fiber, distributed, digital signal enhancement, temperature measurement