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Three-Dimensional Printed Miniature Fiber-Coupled Multipass Cells with Dense Spot Patterns for ppb-Level Methane Detection Using a Near-IR Diode Laser.
Analytical Chemistry ( IF 6.7 ) Pub Date : 2020-09-01 , DOI: 10.1021/acs.analchem.0c01931 Ruyue Cui 1, 2 , Lei Dong 1, 2 , Hongpeng Wu 1, 2 , Weiguang Ma 1, 2 , Liantuan Xiao 1, 2 , Suotang Jia 1, 2 , Weidong Chen 3 , Frank K Tittel 4
Analytical Chemistry ( IF 6.7 ) Pub Date : 2020-09-01 , DOI: 10.1021/acs.analchem.0c01931 Ruyue Cui 1, 2 , Lei Dong 1, 2 , Hongpeng Wu 1, 2 , Weiguang Ma 1, 2 , Liantuan Xiao 1, 2 , Suotang Jia 1, 2 , Weidong Chen 3 , Frank K Tittel 4
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Tunable diode laser absorption spectroscopy (TDLAS) based on a multipass cell (MPC) is a powerful analytical tool and is widely applied to air quality monitoring, industrial process control, and medical diagnostics. However, the conventional MPC as a core component in TDLAS devices has a large size, low utilization efficiency of the mirror surfaces, and tight optical alignment tolerances. In this paper, we design and fabricate a mini-MPC with an optical absorption path length of 4.2 m and dimensions of 4 × 4 × 6 cm3 (open cavity), which, to our best knowledge, is the current smallest MPC in terms of the same optical path length. The mini-MPC generates a seven-nonintersecting-circle dense spot pattern on two 25.4 mm spherical mirror surfaces, providing a high fill factor of 21 cm–2. A fiber-coupled collimator and an InGaAs photodetector are integrated into the mini-MPC via a high-resolution three-dimensional printed frame, hence removing the requirement of active optical alignment. Using a 1.65 μm distributed-feedback laser, the performance of this mini-MPC for methane detection was evaluated in terms of linearity, flow response time, stability, minimum detectable limit, and measurement precision. Continuous measurements of methane near a sewer and in the atmosphere were performed to demonstrate the stability and robustness of the highly integrated mini-MPC-based gas sensor. Our analysis shows that a methane minimum detectable limit of 117 ppbv is achieved, paving the way toward a sensitive, low-cost, and miniature trace gas sensor inherently suitable for large-scale deployment of distributed sensor networks and for handheld mobile devices.
中文翻译：
具有密集光点图案的三维打印微型光纤耦合多通道电池，用于使用近红外二极管激光器检测ppb级甲烷。
基于多通道电池（MPC）的可调谐二极管激光吸收光谱（TDLAS）是功能强大的分析工具，已广泛应用于空气质量监测，工业过程控制和医学诊断。然而，传统的MPC作为TDLAS器件的核心组件，具有大尺寸，镜面利用效率低和严格的光学对准公差的特点。在本文中，我们设计和制造了一个微型MPC，其光吸收路径长度为4.2 m，尺寸为4×4×6 cm 3（开放腔），据我们所知，就目前而言，这是目前最小的MPC具有相同的光程长度。mini-MPC在两个25.4 mm球面镜表面上产生七个不相交的圆形密集光斑图案，提供21 cm –2的高填充因子。光纤耦合的准直仪和InGaAs光电探测器通过高分辨率的三维打印框架集成到mini-MPC中，从而消除了主动光学对准的要求。使用1.65μm分布式反馈激光，从线性，流动响应时间，稳定性，最小可检测限和测量精度方面评估了此mini-MPC用于甲烷检测的性能。对下水道附近和大气中的甲烷进行了连续测量，以证明高度集成的基于微型MPC的气体传感器的稳定性和耐用性。我们的分析表明，甲烷的最低检出限为117 ppbv，这为灵敏，低成本，
更新日期：2020-10-06
中文翻译：
具有密集光点图案的三维打印微型光纤耦合多通道电池，用于使用近红外二极管激光器检测ppb级甲烷。
基于多通道电池（MPC）的可调谐二极管激光吸收光谱（TDLAS）是功能强大的分析工具，已广泛应用于空气质量监测，工业过程控制和医学诊断。然而，传统的MPC作为TDLAS器件的核心组件，具有大尺寸，镜面利用效率低和严格的光学对准公差的特点。在本文中，我们设计和制造了一个微型MPC，其光吸收路径长度为4.2 m，尺寸为4×4×6 cm 3（开放腔），据我们所知，就目前而言，这是目前最小的MPC具有相同的光程长度。mini-MPC在两个25.4 mm球面镜表面上产生七个不相交的圆形密集光斑图案，提供21 cm –2的高填充因子。光纤耦合的准直仪和InGaAs光电探测器通过高分辨率的三维打印框架集成到mini-MPC中，从而消除了主动光学对准的要求。使用1.65μm分布式反馈激光，从线性，流动响应时间，稳定性，最小可检测限和测量精度方面评估了此mini-MPC用于甲烷检测的性能。对下水道附近和大气中的甲烷进行了连续测量，以证明高度集成的基于微型MPC的气体传感器的稳定性和耐用性。我们的分析表明，甲烷的最低检出限为117 ppbv，这为灵敏，低成本，
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