用于多种温室气体检测的波长调制光声光谱仪器系统及在中国秦岭山区的实地应用

IF 7.1 1区医学 Q1 ENGINEERING, BIOMEDICAL

Photoacoustics Pub Date : 2024-05-13 DOI:10.1016/j.pacs.2024.100620

Lixian Liu , Huiting Huan , Xueshi Zhang , Le Zhang , Jinsong Zhan , Shaowei Jiang , Xukun Yin , Baisong Chen , Xiaopeng Shao , Xuesen Xu , Andreas Mandelis

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引用次数: 0

摘要

我们介绍了一种灵敏、紧凑的基于量子级联激光器的光声温室气体传感器，用于检测二氧化碳、甲烷和一氧化碳，并讨论了其在在线实时痕量温室气体分析中的适用性。我们使用了不同尺寸的差分光声谐振器，并对其进行了优化，以平衡灵敏度和信号饱和度。研究了环境参数、气体流速、压力和湿度对光声信号和光谱交叉干扰的影响。由于采用了内部设计的激光控制和锁相放大器，气体检测灵敏度分别为 CH4 5.6 ppb、CO 0.8 ppb 和 CO2 17.2 ppb，信号平均时间为 1 秒，动态范围超过 6 个数量级。在中国秦岭国家植物园（东经 108°29'，北纬 33°43'）的一个观测站进行了为期五天的室外连续测试，证明了温室气体传感器的稳定性和可靠性。

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Wavelength-modulated photoacoustic spectroscopic instrumentation system for multiple greenhouse gas detection and in-field application in the Qinling mountainous region of China

We present a sensitive and compact quantum cascade laser-based photoacoustic greenhouse gas sensor for the detection of CO_2, CH₄ and CO and discuss its applicability toward on-line real-time trace greenhouse gas analysis. Differential photoacoustic resonators with different dimensions were used and optimized to balance sensitivity with signal saturation. The effects of ambient parameters, gas flow rate, pressure and humidity on the photoacoustic signal and the spectral cross-interference were investigated. Thanks to the combined operation of in-house designed laser control and lock-in amplifier, the gas detection sensitivities achieved were 5.6 ppb for CH₄, 0.8 ppb for CO and 17.2 ppb for CO₂, signal averaging time 1 s and an excellent dynamic range beyond 6 orders of magnitude. A continuous outdoor five-day test was performed in an observation station in China’s Qinling National Botanical Garden (E longitude 108°29’, N latitude 33°43’) which demonstrated the stability and reliability of the greenhouse gas sensor.

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来源期刊

Photoacoustics Physics and Astronomy-Atomic and Molecular Physics, and Optics

CiteScore

11.40

自引率

16.50%

发文量

审稿时长

53 days

期刊介绍： The open access Photoacoustics journal (PACS) aims to publish original research and review contributions in the field of photoacoustics-optoacoustics-thermoacoustics. This field utilizes acoustical and ultrasonic phenomena excited by electromagnetic radiation for the detection, visualization, and characterization of various materials and biological tissues, including living organisms. Recent advancements in laser technologies, ultrasound detection approaches, inverse theory, and fast reconstruction algorithms have greatly supported the rapid progress in this field. The unique contrast provided by molecular absorption in photoacoustic-optoacoustic-thermoacoustic methods has allowed for addressing unmet biological and medical needs such as pre-clinical research, clinical imaging of vasculature, tissue and disease physiology, drug efficacy, surgery guidance, and therapy monitoring. Applications of this field encompass a wide range of medical imaging and sensing applications, including cancer, vascular diseases, brain neurophysiology, ophthalmology, and diabetes. Moreover, photoacoustics-optoacoustics-thermoacoustics is a multidisciplinary field, with contributions from chemistry and nanotechnology, where novel materials such as biodegradable nanoparticles, organic dyes, targeted agents, theranostic probes, and genetically expressed markers are being actively developed. These advanced materials have significantly improved the signal-to-noise ratio and tissue contrast in photoacoustic methods.