Highly sensitive portable laser absorption spectroscopy formaldehyde sensor using compact spherical mirror multi-pass cell

被引：5
作者：
Fang, Bo [1 ]
Yang, Nana [1 ]
Wang, Chunhui [1 ,3 ]
Zhao, Weixiong [1 ,3 ]
Zhou, Hao [1 ,2 ]
Zhang, Weijun [1 ,3 ]
机构：
[1] Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Lab Atmospher Physicochem, HFIPS, Hefei 230031, Anhui, Peoples R China
[2] Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China
[3] Univ Sci & Technol China, Sch Environm Sci & Optoelect Technol, Hefei 230026, Anhui, Peoples R China
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 2023年 / 394卷
基金：
中国国家自然科学基金;
关键词：
Formaldehyde; Laser absorption spectroscopy; Optical multi-pass cell; Rapid background subtraction; INTERBAND CASCADE LASER; CAVITY OUTPUT SPECTROSCOPY; GAS SENSOR; INDOOR; SPECTROMETER; INSTRUMENT;
D O I：
10.1016/j.snb.2023.134379
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A portable sensor with an optical case dimension of 46 x 28 x 16 cm3 based on laser absorption spectroscopy for highly sensitive measurement of formaldehyde was reported. A compact improved spherical mirror multi-pass cell consisting of two 5-cm diameter spherical mirrors separated by 17.7 cm was developed. The cell offered a sample volume of 350 mL and an optical absorption path length of 50.6 m, giving a high path length-to-volume ratio of 14.6 cm-2. The sampling response time was less than 1 s, allowing the application of rapid spectral background subtraction technique to effectively suppress optical fringes. The achieved detection limit was 650 pptv (1 & sigma;, 1 s), corresponding to a minimum detection absorption coefficient of 2.3 x 10-9 cm -1. The capability of the HCHO sensor was demonstrated by two days of continuous indoor air monitoring. The developed portable sensor is suitable for mobile and fast indoor air quality measurements.
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页数：7
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