基于阵列法布里-珀罗干涉仪温室气体探测系统灵敏度分析  

Sensitivity Analysis of Greenhouse Gas Detection System Based on Array Fabry-Pérot Interferometer

作　　者：余苗 傅頔 张强 王素凤 文镇清 刘长海 王云刚 李静 冯玉涛[1] Yu Miao;Fu Di;Zhang Qiang;Wang Sufeng;Wen Zhenqing;Liu Changhai;Wang Yungang;Li Jing;Feng Yutao(Key Laboratory of Spectral Imaging Technology,Xi’an Institute of Optics and Precision Mechanic,Chinese Academy of Sciences,Xi’an 710119,Shaanxi,China;University of Chinese Academy of Sciences,Beijing 100049,China;Unit 63768 of People’s Liberation Army of China,Xi’an 710200,Shaanxi,China;Key Laboratory of Space Weather,National Satellite Meteorological Center(National Center for Space Weather),China Meteorological Administration,Beijing 100081,China)

机构地区：[1]中国科学院西安光学精密机械研究所光谱成像技术重点实验室,陕西西安710119 [2]中国科学院大学,北京100049 [3]中国人民解放军63768部队,陕西西安710200 [4]国家卫星气象中心(国家空间天气监测预警中心)中国气象局空间天气重点开放实验室,北京100081

出　　处：《光学学报》2024年第24期137-147,共11页Acta Optica Sinica

基　　金：国家自然科学基金项目(41005019);中国科学院西部青年学者项目(XAB2016A07);陕西省自然科学基础研究计划项目(2019JQ931)。

摘　　要：阵列法布里珀罗(FP)干涉仪结构紧凑、无运动部件,能兼顾光程差采样密度与范围,能够应用于实现高精度、低成本温室气体探测的有效技术方案。FP干涉仪设计参数是影响温室气体探测能力的核心要素,因此构建以积分灵敏度为导向的干涉仪参数优化设计方法是开展面向温室气体探测的阵列FP干涉技术研究的必要基础。基于阵列FP干涉仪温室气体探测原理,建立阵列FP原始干涉数据仿真模型,分析FP间隔厚度、干涉腔反射率、FP数目以及相邻FP光程差采样间隔对系统探测灵敏度的影响。结果表明,二氧化碳探测系统和甲烷探测系统的干涉腔反射率分别为0.42和0.47时,系统归一化灵敏度取得极大值;系统积分灵敏度与FP数目正相关;相邻FP光程差采样间隔取1/4波长时,既能保证较高的积分灵敏度又能实现较宽的光程差采样范围。Objective In response to the urgent demand for highprecision global greenhouse gas(GHG)emissions monitoring,essential for carbon inventories and enforcement,achieving lowcost,highresolution detection has become a key research focus.The array FabryPérot(FP)spectrometer,with its compact structure,lack of moving parts,and ability to account for both the sampling density and range of optical path differences,presents an effective solution for achieving accurate and costefficient GHG detection.The parameters of the array FP interferometer are critical to the system’s optical performance and directly affect detection accuracy.To establish optimal detection parameters,we explore the effects of variables such as FP interval thickness,interferometric cavity reflectivity,FP quantity,and adjacent FP optical path difference sampling interval on system sensitivity.By analyzing the variation in integral sensitivity with changes in GHG volume fraction,we determine the optimal parameters for spectrometer design,providing a theoretical foundation for further research on array FP spectrometers for GHG detection.Methods Using the upwelling radiance spectra of GHGs at varying concentrations as input,we propose a simulation model for raw interferometric data from the array FP spectrometer.The influence of spectrometer parameters on system detection sensitivity is analyzed using this model.To maximize integral sensitivity,the analysis focuses on how varying the thickness of the FP intervals affects integral sensitivity and determines the optimal thickness of the FP plates.To achieve maximum normalized sensitivity for the detection system,the relationship between signaltonoise ratio(SNR),spectral resolution,detection sensitivity,and interferometric cavity reflectivity is analyzed,confirming the optimal reflectivity value.In addition,the effect of the number of FP cavities and the adjacent FP optical path difference sampling interval on integral sensitivity is evaluated.Results and Discussions This analysis quantitatively evaluates h

关 键 词：温室气体 二氧化碳 甲烷 法布里珀罗干涉仪 探测灵敏度 

分 类 号：TP722.5[自动化与计算机技术—检测技术与自动化装置]