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论文类型：期刊论文

发表时间：2012-07-01

发表刊物：National Conference on Optical Fiber Sensors (OFSC)

收录刊物：SCIE、EI、CPCI-S、Scopus

卷号：10

期号：7,SI

页面范围：1488-1492

ISSN号：1546-198X

关键字：Quasi-Distributed Temperature Sensor; FBG; Package; Demodulation; Down-Hole Monitoring

摘要：To overcome disadvantages of traditional electronic sensors, such as low reliability, large drift at high temperature, limited to a single point measurement and so on, a quasi-distributed temperature sensor system for down-hole monitoring based on the fiber Bragg grating (FBG) is designed in this paper. The working principle, package structure and signal demodulating method of this system are proposed in detail. Compared with other peak-detected algorithms, the direct Gaussian fitting algorithm was used to achieve a high precision and steady demodulation result of the reflection spectrum of the FBG. A triple layer metal tubing protection scheme was proposed to meet the critical measurement requirement in the harsh environment of the oil well. Experimental results show that the measurement accuracy is less than 0.26% with the full scale (F.S.) of 250 degrees C; the maximum of absolute-resolution is 0.15 degrees C, corresponding to a relative-resolution of 0.06% F.S. (250 degrees C); the repeatability is less than 0.13% F.S. (250 degrees C), and the long-term stability at 250 degrees C is less than 0.11% F.S.