基于QEPAS检测氨气痕量气体的研究

痕量氨气（NH3）检测在大气质量监测和人类疾病预防等方面具有重要意义，然而现有氨气检测方法难以满足当前需求。针对石英增强型光声光谱技术（quartz enhanced photoacoustic spectroscopy, QEPAS） 具有灵敏度高、监测实时性好、环境噪声免疫性高等优点，该文在阐述检测原理的基础上，选用中心波长为1531．65nm的分布反馈式激光器（ distributed feedback laser, DFB ）作为光源，室温下氨气标准气体作为被测对象，搭建了基于QEPAS的NH3气体检测系统。该系统确定了谐振管的尺寸和位置，优化了激光滤波准直光路，并结合波长调制与谐波检...

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Bibliographic Details
Published in电机与控制学报 Vol. 20; no. 8; pp. 112 - 118
Main Author 张佳薇 邸晓彤 范浩 李明宝
Format Journal Article
LanguageChinese
Published 东北林业大学机电工程学院,黑龙江哈尔滨,150040%东北林业大学土木工程学院,黑龙江哈尔滨,150040 2016
Subjects
DFB激光器
QEPAS
氨气
痕量气体
石英音叉
谐波检测
石英音叉
DFB激光器
氨气
quartz tuning fork
QEPAS
ammonia
痕量气体
谐波检测
trace gas
DFB laser
harmonic detection
Online AccessGet full text
ISSN1007-449X
DOI10.15938/j.emc.2016.08.015

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Summary:痕量氨气（NH3）检测在大气质量监测和人类疾病预防等方面具有重要意义，然而现有氨气检测方法难以满足当前需求。针对石英增强型光声光谱技术（quartz enhanced photoacoustic spectroscopy, QEPAS） 具有灵敏度高、监测实时性好、环境噪声免疫性高等优点，该文在阐述检测原理的基础上，选用中心波长为1531．65nm的分布反馈式激光器（ distributed feedback laser, DFB ）作为光源，室温下氨气标准气体作为被测对象，搭建了基于QEPAS的NH3气体检测系统。该系统确定了谐振管的尺寸和位置，优化了激光滤波准直光路，并结合波长调制与谐波检测技术，实现了氨气浓度的检测。检测结果表明，QEPAS系统的二次谐波信号与NH，浓度具有良好的线性关系。该系统的检测极限精确度为146ppb，稳定响应时间约为40s，4小时连续检测相对误差为2．34％。
Bibliography:23-1408/TM
ZHANG Jia-wei, DI Xiao-tong, FAN Hao, LI Ming-bao （1. College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, China; 2. School of Civil Engineering, Northeast Forestry University, Harbin 150040, China）
Trace gas detection of ammonia （ NH3 ） concentration plays an important role in air quality monitoring and prevention of human diseases. However the existing NH3 detection methods don＇ t conform to current needs. Quartz enhanced photoacoustic spectroscopy technology （QEPAS） has advantages of high sensitivity, perfect ability to real-time detect and ambient noise immunity. On the basis of the detection principle, the light source was a distributed feedback （DFB） laser with the center wavelength of 1531. 65nm and the measured trace gas was NH3 concentration at atmosphere and ambient temperature. Estab- lished trace gas NH3 detection system by using QEPAS. The size and location of resonator tubes and the collimated optical path of the laser was optimized. Combined w
ISSN:1007-449X
DOI:10.15938/j.emc.2016.08.015