基于激光的甲烷光声和光学检测方法的比较

IF 0.8 Q4 INSTRUMENTS & INSTRUMENTATION Journal of Sensors and Sensor Systems Pub Date : 2021-02-22 DOI:10.5194/JSSS-10-25-2021
T. Strahl, J. Herbst, Eric Maier, S. Rademacher, C. Weber, H. Pernau, A. Lambrecht, J. Wöllenstein
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引用次数: 5

摘要

摘要低甲烷(CH4)浓度的测量是工业和公共基础设施安全以及环境研究的一个关键目标。激光光谱学最适合用于此目的,因为它具有高灵敏度、选择性、动态范围和快速测量速率。这项技术的物理基础是分子气体的红外吸收。在近红外(NIR)、中波(MWIR)和长波(LWIR)红外范围的三个波长区域,比较了两种检测方案——直接吸收光谱(DAS)和光声光谱(PAS)。对于每个光谱范围,选择合适的半导体激光器并用于两种检测技术:二极管激光器(DL)、带间级联激光器(ICL)和量子级联激光器(QCL),分别用于NIR、MWIR和LWIR。对于DAS,采用与PAS的光声池的池尺寸相当的短吸收路径长度。我们表明,对于DAS,在噪声当量浓度(NECs)低于10的MWIR范围内可以达到最低检测极限 ppb。与DAS相比,使用PAS可以达到更低的检测极限和更高的系统稳定性,尤其是在长集成时间的情况下。PAS的最低检测限在LWIR中获得,NEC为7 ppb。讨论了不同的DAS和PAS配置的潜在应用。
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Comparison of laser-based photoacoustic and optical detection of methane
Abstract. The measurement of low methane ( CH4 ) concentrations is a key objective for safety of industrial and public infrastructures and in environmental research. Laser spectroscopy is best suited for this purpose because it offers high sensitivity, selectivity, dynamic range, and a fast measurement rate. The physical basis of this technique is infrared absorption of molecular gases. Two detection schemes – direct absorption spectroscopy (DAS) and photoacoustic spectroscopy (PAS) – are compared at three wavelength regions in the near-infrared (NIR), mid-wavelength (MWIR), and long-wavelength (LWIR) infrared ranges. For each spectral range a suitable semiconductor laser is selected and used for both detection techniques: a diode laser (DL), an interband cascade laser (ICL), and a quantum cascade laser (QCL) for NIR, MWIR and LWIR, respectively. For DAS short absorption path lengths comparable to the cell dimensions of the photoacoustic cell for PAS are employed. We show that for DAS the lowest detection limit can be achieved in the MWIR range with noise-equivalent concentrations (NECs) below 10 ppb. Using PAS, lower detection limits and higher system stabilities can be reached compared to DAS, especially for long integration times. The lowest detection limit for PAS is obtained in the LWIR with a NEC of 7 ppb. The different DAS and PAS configurations are discussed with respect to potential applications.
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来源期刊
Journal of Sensors and Sensor Systems
Journal of Sensors and Sensor Systems INSTRUMENTS & INSTRUMENTATION-
CiteScore
2.30
自引率
10.00%
发文量
26
审稿时长
23 weeks
期刊介绍: Journal of Sensors and Sensor Systems (JSSS) is an international open-access journal dedicated to science, application, and advancement of sensors and sensors as part of measurement systems. The emphasis is on sensor principles and phenomena, measuring systems, sensor technologies, and applications. The goal of JSSS is to provide a platform for scientists and professionals in academia – as well as for developers, engineers, and users – to discuss new developments and advancements in sensors and sensor systems.
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