A fiber air-gap Fabry-Perot temperature sensor demodulated by using frequency modulated continuous wave

作者：Zheng, Wanfu; Xie, Jianglei; Li, Yi^*; Xu, Ben; Kang, Juan; Shen, Changyu; Wang, Jianfeng; Jin, Yongxing; Liu, Honglin; Ni, Kai; Dong, Xinyong; Zhao, Chunliu; Jin, Shangzhong

来源：Optics Communications, 2014, 324: 234-237.

DOI：10.1016/j.optcom.2014.03.065

• FMCW
• Fiber FPI
• Resolution
• Demodulation

In this study, a fiber in-line air-gap Fabry-Perot interferometer (FPO is fabricated by HF acid etching. For a low-cost and higher precise measurement, a demodulation system based on frequency modulated continuous wave (FMCW) technique is build up and demonstrated in this air-gap FPI. In temperature measurements, the temperature sensitivity is about 1.75 rad/degrees C by phase shift detection. We also test the long term performance of the system and the RMS error is about 0.04 rad, which corresponds to the temperature resolution of similar to 0.02 degrees C. It is much higher than the measurement resolution by using the traditional wavelength shift detection method. Our experiments show that the FMCW can provide a low-cost, high resolution and high speed interrogation solution to the fiber FPIs.

• 出版日期2014-8-15
• 单位中国计量大学