调制式光纤甲烷气体传感器的研究

利用Fabry-Perot 腔的选频特性，考虑与光纤的低损耗窗口相一致和价格等因素，以价
廉的1300nm 波段的LED 作为光源，实现了PZT 对Fabry-Perot 腔的正弦调制；对甲烷气体浓度进行谐波检测，检测灵敏度可达10ppm。研究表明，该传感器灵敏度和稳定性大大提高。
关键词：法布里-珀罗谐振腔；光纤传感器；气体传感器；谐波检测
Abstract: With the frequency-selecting property of Fabry-Perot cavity and taking account of consistent with low loss window of optic fiber and price etc factors, a sinusoidal modulation for Fabry-Perot cavity with PZT is carried out by using the cheap LED operating at 1300nm wavelength as light source. The CH4 concentration is detected with harmonic wave and the detection sensitivity can be as high as 10ppm. The study shows that both the sensitivity and stability of the sensor have been greatly improved.
Key words: Fabry-Perot resonators；Optical fiber sensor；Gas sensor；Harmonic detection