利用Fabry-Perot 腔的選頻特性，考慮與光纖的低損耗窗口相一致和價格等因素，以價
廉的1300nm 波段的LED 作為光源，實現了PZT 對Fabry-Perot 腔的正弦調制；對甲烷氣體濃度進行諧波檢測，檢測靈敏度可達10ppm。研究表明，該傳感器靈敏度和穩定性大大提高。
關鍵詞：法布里-珀羅諧振腔；光纖傳感器；氣體傳感器；諧波檢測
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