Zhao Yan, Jin Wei, Lin Yuechuan, Yang Fan, Ho Hoi Lut
Opt Lett. 2018 Apr 1;43(7):1566-1569. doi: 10.1364/OL.43.001566.
We present an all-fiber intracavity photothermal (IC-PT) spectroscopic gas sensor with a hollow-core photonic bandgap fiber (HC-PBF) gas cell. The gas cell is placed inside a fiber-ring laser cavity to achieve higher laser light intensity in the hollow core and hence higher PT modulation signal. An experiment with a 0.62-m-long HC-PBF gas cell demonstrated a noise equivalent concentration of 176 ppb acetylene. Theoretical modeling shows that the IC-PT sensor has the potential of achieving sub-ppb (parts-per-billion) acetylene detection sensitivity.
我们展示了一种带有空心光子带隙光纤（HC-PBF）气室的全光纤腔内光热（IC-PT）光谱气体传感器。该气室置于光纤环形激光腔内，以在空心芯中实现更高的激光强度，从而获得更高的光热调制信号。使用一个0.62米长的HC-PBF气室进行的实验表明，乙炔的噪声等效浓度为176 ppb。理论建模表明，IC-PT传感器有潜力实现亚ppb（十亿分之一）的乙炔检测灵敏度。
