| Title: | A Mid-Infrared Quantum Cascade Laser Ultra-Sensitive Trace Formaldehyde Detection System Based on Improved Dual-Incidence Multipass Gas Cell |
| Author(s): | Wu T; Hu R; Xie P; Zhang L; Hu C; Liu X; Wang J; Zhong L; Tong J; Liu W; |
| Address: | "Key Laboratory of Environment Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China. Graduate School of Science Island Branch, University of Science and Technology of China, Hefei 230026, China. University of Chinese Academy of Sciences, Beijing 100049, China. School of Pharmacy, Anhui Medical University, Hefei 230032, China" |
| ISSN/ISBN: | 1424-8220 (Electronic) 1424-8220 (Linking) |
| Abstract: | "Formaldehyde (HCHO) is a tracer of volatile organic compounds (VOCs), and its concentration has gradually decreased with the reduction in VOC emissions in recent years, which puts forward higher requirements for the detection of trace HCHO. Therefore, a quantum cascade laser (QCL) with a central excitation wavelength of 5.68 mum was applied to detect the trace HCHO under an effective absorption optical pathlength of 67 m. An improved, dual-incidence multi-pass cell, with a simple structure and easy adjustment, was designed to further improve the absorption optical pathlength of the gas. The instrument detection sensitivity of 28 pptv (1sigma) was achieved within a 40 s response time. The experimental results show that the developed HCHO detection system is almost unaffected by the cross interference of common atmospheric gases and the change of ambient humidity. Additionally, the instrument was successfully deployed in a field campaign, and it delivered results that correlated well with those of a commercial instrument based on continuous wave cavity ring-down spectroscopy (R(2) = 0.967), which indicates that the instrument has a good ability to monitor ambient trace HCHO in unattended continuous operation for long periods of time" |
| Keywords: | "*Lasers, Semiconductor Incidence *Formaldehyde Gases Spectrum Analysis detection of trace HCHO dual-incidence multi-pass cell field campaign gas sensor mid-infrared unattended continuous operation;" |
| Notes: | "PubMed-not-MEDLINEWu, Tao Hu, Renzhi Xie, Pinhua Zhang, Lijie Hu, Changjin Liu, Xiaoyan Wang, Jiawei Zhong, Liujun Tong, Jinzhao Liu, Wenqing eng 62275250, U19A2044, 61905003/National Natural Science Foundation of China/ No. 2008085J20/Natural Science Foundation of Anhui Province/ 2022l07020022/Key Technologies Research and Development Program of Anhui Province/ 2022YFC3700301/National Key Research and Development Program of China/ Switzerland 2023/07/08 Sensors (Basel). 2023 Jun 16; 23(12):5643. doi: 10.3390/s23125643" |
