Gas concentration sensor and gas concentration detection device

Abstract

The invention is applicable to the technical field of gas measurement sensing devices, and provides a gas concentration sensor and a gas concentration detection device. The gas concentration sensor comprises a first optical fiber, a hollow-core photonic crystal fiber and a second optical fiber which are sequentially arranged, and the hollow-core photonic crystal fiber is of a hollow tubular structure; an acoustic resonant cavity is formed in the tubular structure of the hollow-core photonic crystal fiber, and probe light and pump light are incident from the end, away from the hollow-core photonic crystal fiber, of the first fiber. The miniaturization of the probe of the photoacoustic spectroscopy sensor is realized, and the sensor can be suitable for measurement under the conditions of trace gas, micro space and the like; long-distance measurement can be carried out only by extending the optical fiber; the whole acoustic resonant cavity is filled with photoacoustic sound wave information, the photoacoustic information is detected by detecting the phase difference of detection light in the acoustic resonant cavity, and the utilization rate of sound wave information in the acoustic resonant cavity is increased; meanwhile, the reduction of the quality factor of the acoustic resonant cavity caused by the introduction of the microphone can be avoided. 本申请适用于气体测量传感装置技术领域，提供了一种气体浓度传感器和气体浓度检测装置，气体浓度传感器包括依次设置的第一光纤、空芯光子晶体光纤和第二光纤，空芯光子晶体光纤呈空心的管状结构，且空芯光子晶体光纤的管状结构内部形成声学谐振腔，探测光和泵浦光均从第一光纤远离空芯光子晶体光纤的一端入射。实现了光声光谱学传感器探头的小型化，能够适用于微量气体、微小空间等情形下的测量；只需要延长光纤即可进行远距离测量；光声声波信息充斥在整个声学谐振腔中，通过检测探测光在声学谐振腔中的相位差检测光声信息，提高了对声学谐振腔中的声波信息的利用率；同时还能够避免引入麦克风造成的声学谐振腔品质因数的降低。