Fibre-coupled, multiplexed methane detection using range-resolved interferometry
Fibre-coupled, multiplexed methane detection using range-resolved interferometry
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DOI：
10.1088/2515-7647/abe0fd
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发表时间：
2021-02
期刊：
影响因子：
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通讯作者：
J. Bremner;T. Kissinger;J. Hodgkinson;R. Tatam
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文献类型：
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作者：
J. Bremner;T. Kissinger;J. Hodgkinson;R. Tatam
我们描述了首次使用距离分辨干涉信号处理测量光谱传输。利用可调谐二极管激光光谱将其应用于气体传感，可以同时独立测量多个气体池中的甲烷浓度。该系统采用单个注入电流调制二极管激光器和单个光电探测器。对于三个气体电池，我们证明了该系统能够在0.5 s的测量周期内测量噪声等效浓度小于200 ppm的甲烷，并在150 s的平均时间内测量潜在噪声等效浓度(1σ) <20 ppm。我们进一步表明，细胞间的串扰低于系统的实验不确定度。
We describe the first use of range-resolved interferometric signal processing for measurement of spectral transmission. This was applied to gas sensing using tunable diode laser spectroscopy, allowing the simultaneous and independent measurement of methane concentrations in multiple gas cells. The system uses a single injection-current modulated diode laser and a single photodetector. For three gas cells, we show the ability of the system to measure methane at noise equivalent concentrations of less than 200 ppm for a 0.5 s measurement period and a potential noise equivalent concentration (1σ) of <20 ppm with 150 s averaging time. We further show that cross-talk between cells is below the experimental uncertainty for the system.