共光声池腔芯轴型空气衬底光纤麦克风  

Air-Backed Mandrel Fiber Optic Microphone with a Resonant Photoacoustic Tube

作　　者：张刚[1,2] 吴许强[1,2] 汪辉 葛强 左铖 余国锋[5] 唐春安[6] 俞本立[1,2] Zhang Gang;Wu Xuqiang;Wang Hui;Ge Qiang;Zuo Cheng;Yu Guofeng;Tang Chun'an;Yu Benli(Key Laboratory of Opto Electronic Information Acquisition and Manipulation of Ministry of Education,Anhui University,Hefei,Anhui 230601,China;Information Materials and Intelligent Sensing Laboratory of Anhui Province,Anhui University,Hefei,Anhui 230601,China;Anhui Ideteck Co.,Ltd.,Hefei,Anhui 230088,China;School of Mathematics and Physics,Anhui Polytechnic University,Wuhu,Anhui 241000,China;State Key Laboratory of Deep Coal Mining&Environment Protection,Huainan Mining(Group)Co.,Ltd.,Huainan,Anhui 232001,China;State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China)

机构地区：[1]安徽大学光电信息获取与控制教育部重点实验室,安徽合肥230601 [2]安徽大学信息材料与智能感知安徽省实验室,安徽合肥230601 [3]安徽至博光电技术有限公司,安徽合肥230088 [4]安徽工程大学数理学院,安徽芜湖241000 [5]淮南矿业(集团)有限责任公司深部煤炭开采与环境保护国家重点实验室,安徽淮南232001 [6]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《光学学报》2021年第2期28-36,共9页Acta Optica Sinica

基　　金：国家自然科学基金(51627804);国家重点研发项目(2016YFC0301902);安徽省重点研发项目(1804a0802214);安徽大学微弱信号感测材料与器件集成协同创新中心开放基金(WRXH201704);光电信息获取与控制教育部重点实验室开放基金(OEIAM202002)。

摘　　要：声传感器和光声池是激光光声光谱技术的核心组件。结合光纤迈克耳孙干涉仪、相位载波解调技术和纵向共振光声池,提出一种共光声池腔的芯轴型空气衬底光纤麦克风。光纤麦克风中的铜毛细管被用作光声池的共振腔,传感臂由10 m长的超细光纤缠绕在铜毛细管上构成,参考臂为5 cm长的短臂且已进行隔声隔振处理。基于结构共振频率稳定的特点,优化光纤麦克风的共振频率,使其略低于光声池的一阶纵向共振频率,以实现准双共振。实验结果表明,麦克风在共振频率为1443 Hz处的最小可检测声压为0.69μPa√Hz。在1 kHz处,声压电压响应线性度为99.98%(5 mPa~3 Pa),动态范围为112.52 dB。该光纤麦克风适用于高温、易爆和高电磁干扰等特殊环境下痕量气体的高精度检测。Acoustic sensor and photoacoustic cell are key components of laser-based photoacoustic spectroscopy.In this paper,we proposed an air-backed mandrel fiber optic microphone with a resonant photoacoustic tube,combining the technologies of fiber Michelson interferometer,phase generated carrier demodulation,and longitudinal resonant photoacoustic cell.In the microphone,we fabricated a sensing arm by wrapping a 10-meter ultra-thin single-mode fiber on a copper capillary tube that was also utilized as the resonant tube of the photoacoustic cell.Besides,a 5-cm reference arm has been isolated from sound and vibration.Furthermore,the resonant frequency of the microphone was designed to be slightly lower than the first-order longitudinal resonant frequency of the photoacoustic cell to achieve quasi-double resonance as the resonant frequency of the microphone was stable.The experimental results show that the minimum resolution is 0.69μPa√Hz at the resonant frequency of 1443 Hz,and the linearity of acoustic pressure and voltage response is 99.98%(5 mPa-3 Pa)with a dynamic range of 112.52 dB at 1 kHz.In conclusion,the microphone can be applied for trace gas detection in high-temperature,explosive,or high-electromagnetic-interference environments.

关 键 词：光纤光学 麦克风 光声光谱 纵向共振光声池 光纤迈克耳孙干涉仪 相位载波解调 

分 类 号：TN929.11[电子电信—通信与信息系统]