基于宽带光源的光声传感器用于氨气探测  

Photoacoustic sensor based on broadband light source for ammonia detection

作　　者：孙柳雅 牛明生[1] 陈加雪 唐敏 尹亚婕 欧阳金华 SUN Liuya;NIU Mingsheng;CHEN Jiaxue;TANG Min;YIN Yajie;OUYANG Jinhua(Shandong Provincial Key Laboratory of Laser Polarization and Information Technology,Laser Research Institute,School of Physical Engineering,Qufu Normal University,Qufu 273165,China)

机构地区：[1]山东省曲阜师范大学物理工程学院激光研究所,山东省激光偏振与信息技术重点实验室,山东曲阜273165

出　　处：《大气与环境光学学报》2024年第5期580-588,共9页Journal of Atmospheric and Environmental Optics

基　　金：山东省自然科学基金(ZR2018MD015);山东省重点研发计划项目(2017GSF17125);大学生创新实验项目(XJ20200071)。

摘　　要：对来自不同排放源的氨气进行高灵敏度探测,可以为环境治理和医疗诊断等方面提供一定的参考依据。然而,目前的氨气传感器存在在近红外波段吸收线强较弱、在中红外波段光源成本高且普遍体积大等缺点。本工作开发了一款基于宽带光源的光声传感器,选择的工作波长在2239 nm附近,此处的氨气线强量级较大为10-20cm/molecule,可以有效避免CO_(2)和H_(2)O的干扰。研究结果表明:该光声池的共振频率为1830 Hz;在室温、一个大气压和光功率为2.46 m W的实验条件下,对不同浓度的氨气测量信号进行线性拟合,线性度可达0.98976,系统具有良好的线性响应特性;Allan方差分析表明该系统稳定的最优积分时间为100 s。该传感器能满足对来自不同排放源氨气的探测要求,对实现氨气的高灵敏度探测具有重要的参考价值。High sensitivity of ammonia detection from different emission sources can provide certain reference for environmental management and medical diagnosis.However,current ammonia sensors have the disadvantages of weak absorption line of ammonia in the near infrared band,high cost of mid-infrared light source and generally large volume.A photoacoustic sensor based on broadband light source was proposed in this work.For this system,the selected working wavelength is around 2239 nm,where the line intensity of ammonia is 10-20 cm/molecule,which can effectively avoid the interference of CO_(2)and H_(2)O.The results show that,the resonance frequency of the photoacoustic cell is 1830 Hz,the linear fitting of the measured signals of ammonia with different concentrations can reach 0.98976 under the conditions of room temperature,one atmosphere pressure and optical power of 2.46 mW,indicating the good linear response characteristic of the system,and Allan variance analysis show that the optimal integration time of the system is 100 s.It is shown that the developed sensor can meet the detection requirements of ammonia from different emission sources,and has important reference for realizing high sensitivity detection of ammonia.

关 键 词：气体传感器 光声光谱 宽带光源 氨气探测 

分 类 号：O433[机械工程—光学工程]