High accuracy temperature sensing system exploiting a Sagnac interferometer and an optoelectronic oscillator
High accuracy temperature sensing system exploiting a Sagnac interferometer and an optoelectronic oscillator
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DOI：
10.1016/j.optlastec.2019.105951
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发表时间：
2020-03
影响因子：
5
通讯作者：
Ling Liu;Han Gao;T. Ning;L. Pei;Jingjing Zheng;Jing Li;Jian Xu
中科院分区：
文献类型：
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作者：
Ling Liu;Han Gao;T. Ning;L. Pei;Jingjing Zheng;Jing Li;Jian Xu
提出了一种基于Sagnac干涉仪(SI)和光电振荡器(OEO)的高精度温度传感系统，并进行了实验验证。采用构成SI的保偏光纤(PMF)作为传感单元，当PMF经历温度变化时，SI的自由光谱范围(FSR)发生变化，从而导致振荡信号的频移。研究了光电倍增管对温度的频率响应，测量了该温度传感系统的灵敏度为−2660.6 /°C，讨论了光电倍增管的稳定性，获得了用光纤环形谐振腔实现的0.0173 kHZ°C的高测量精度。此外，传统的SI和OO的结合允许对所提出的系统进行高速询问，并扩展了传统光纤传感器的应用。
A temperature sensing system with high measurement accuracy based on a Sagnac interferometer (SI) and an optoelectronic oscillator (OEO) is proposed and experimentally demonstrated. The polarization maintaining fiber (PMF) constituting the SI, is employed as the sensing unit such that the free spectrum range (FSR) of the SI changes when the PMF experiences temperature variations, which results in the frequency shifts of the oscillating signal. The frequency response of the OEO with respect to the temperature is investigated, and the sensitivity of the proposed temperature sensing system is measured to be −2660.6 kHz/°C. The stability of the OEO is also discussed, and the high measurement accuracy of 0.0173 °C implemented by a fiber ring resonator (FRR) is obtained. Furthermore, the combination of traditional SI and OEO allows for the high-speed interrogation of the proposed system and extends the applications of traditional fiber optic sensors.