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介绍了一种基于光子晶体光纤(PCF)干涉仪的新型氢气传感器。该传感器采用反射式光路设计,在氢气传感单元中引入一段PCF。该PCF的一端以及一部分包层外壁在真空条件下蒸镀了一层金属钯膜,另一端接入光路,构成一套全光纤氢气传感系统。实验中记录了氢气浓度(体积分数)从0到5%变化时传感单元对应的干涉谐振波长的变化,谐振波长最大的移动可达1.2nm,相比大多数基于布拉格光栅的光纤氢气传感器,相同条件下灵敏度有很大的提高。整套传感系统未引入任何分立的光学元件,在兼顾了全光纤光路的条件下,实现了较高的检测灵敏度。
A new type of hydrogen sensor based on photonic crystal fiber (PCF) interferometer is introduced. The sensor uses a reflective light path design that introduces a section of PCF into the hydrogen sensing cell. One end of the PCF and a part of the cladding outer wall are deposited with a layer of metal palladium film under vacuum and the other end is connected to the optical path to form a set of all-fiber hydrogen sensing system. The change of interference resonance wavelength of sensing unit corresponding to the change of hydrogen concentration (volume fraction) from 0 to 5% was recorded in the experiment, and the maximum shift of resonant wavelength was up to 1.2 nm. Compared with most optical fiber hydrogen sensors based on Bragg grating, Sensitivity under the same conditions have greatly improved. The entire sensing system does not introduce any separate optical components, in taking into account the conditions of all-fiber optical path, to achieve a high detection sensitivity.