A method of PLL detection applied in fiber optic evanescent wave temperature sensor

摘要：

A method of phase-lock loop (PLL) detection applied in fiber optic evanescent wave temperature sensor is presented in this paper. The fiber optic evanescent wave sensor is fabricated by a fiber optic coupler whose cladding of waist is replaced by temperature sensitive material. In order to demonstrate its sensitivity to temperature with high stability, the PLL detection circuit to measure the temperature variety with high accuracy is be described in detail. Compared with conventional DC signal detection, the PLL detection technique has great improvement on denoise, which is able to detect weak signal buried in noise. Experiments demonstrated that the resolution to temperature could reach 0.091 ? with such temperature sensor system.

关键词： Temperature sensor evanescent wave fiber optic coupler PLL detection synchronous demodulation

作者: Chen Xiang Wang Min Pang Fufei Wang Tingyun

作者单位: Shanghai University,Shanghai 200072 China

会议类型: 国际会议

会议名称: 第八届国际电子测量与仪器学术会议(Proceedings of 2007 8th International Conference on Electronic Measurement & Instruments)

会议地点: 西安

会议语种:英文

在线出版日期: 2007-08-16（万方平台首次上网日期，不代表论文的发表时间）