A comparison of topologies used in an interferometric gas detection technique
A comparison of topologies used in an interferometric gas detection technique
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干涉气体检测技术中使用的拓扑结构的比较
DOI：
10.1117/12.2555755
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Bremner J
中科院分区：
文献类型：
--
作者：
Bremner J
我们描述了一种可调谐二极管激光光谱和距离分辨干涉测量的组合，该组合使用单个激光器和光电检测器实现多点气体检测。可调谐二极管激光光谱（TDLS）允许通过测量气体的光学吸收来检测气体，同时二极管激光器通过吸收线调谐。距离分辨干涉测量（RRI）采用先前用于位置感测和振动测量的信号处理技术。工作原理是耦合到干涉仪网络中的激光器的发射波长的正弦调制。对检测到的信号进行解调以给出每个干涉仪内的信号幅度。来自不同干涉仪的信号可以根据光程长度差异进行区分，从而能够同时对多个测量通道进行连续询问。在这项工作中，一些气室与光纤相结合，以创建嵌套干涉仪系统，包括气室和一个共同的本地振荡器的组合。用快速正弦（49 kHz）和慢速（2 Hz）斜坡波形的组合调制激光波长，斜坡扫描激光的中心波长通过1653 nm处的甲烷吸收线。使用RRI技术提取每个细胞的强度信号，以测量每个细胞内的甲烷浓度。马赫-曾德尔拓扑允许测量低至200 ppm浓度的甲烷。我们讨论了更适合现场部署的其他拓扑结构的潜在性能。
We describe a combination of Tunable Diode Laser Spectroscopy and Range Resolved Interferometry that enables multipoint gas detection using a single laser and photodetector. Tunable Diode Laser Spectroscopy (TDLS) permits gas detection via the measurement of its optical absorption while a diode laser is tuned through an absorption line. Range Resolved Interferometry (RRI) employs a signal processing technique previously used for position sensing and vibrometry. The principle of operation is the sinusoidal modulation of the emission wavelength of a laser which is coupled into a network of interferometers. The detected signal is demodulated to give the signal amplitude within each interferometer. Signals from different interferometers can be distinguished based on the optical path length difference, enabling continuous interrogation of multiple measurement channels simultaneously. In this work, a number of gas cells are combined with optical fibre to create systems of nested interferometers, including a combination of gas cells and a common local oscillator. The laser wavelength was modulated with a combination of fast sinusoidal (49kHz) and slow (2Hz) ramp wave forms, the ramp sweeping the central wavelength of the laser through the methane absorption line at 1653nm. The intensity signal for each cell was extracted using the RRI technique in order to measure the methane concentration within each cell A Mach-Zehnder topology allows the measurement of methane at concentrations as low as 200ppm. We discuss the potential performance of other topologies that are more suitable for field deployment.
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DOI：
10.1016/j.jqsrt.2013.07.002
发表时间：
2013-11-01
影响因子：
2.3
作者：
Rothman, L. S.;Gordon, I. E.;Wagner, G.
通讯作者：
Wagner, G.
采用调频连续波技术的光纤气体传感器的多路复用。
影响因子：
1.9
作者：
H. Yu;W. Jin;H. Ho;K. Chan;C. Chan;M. Demokan;G. Stewart;B. Culshaw;Y. Liao
通讯作者：
Y. Liao
影响因子：
3.8
作者：
Kissinger, Thomas;Charrett, Thomas O. H.;Tatam, Ralph P.
通讯作者：
Tatam, Ralph P.
使用范围分辨干涉测量通过单个访问端口进行二维远程干涉测量台编码器
DOI：
10.1117/12.2525596
发表时间：
2019
期刊：
--
影响因子：
--
作者：
Wiseman K
通讯作者：
Wiseman K
影响因子：
4.7
作者：
Kissinger, Thomas;Chehura, Edmond;Tatam, Ralph P.
通讯作者：
Tatam, Ralph P.