Methane sensing in the mid-IR using short wave IR photon counting detectors via non-linear interferometry
arxiv(2022)
摘要
We demonstrate a novel MIR methane sensor shifting measurement wavelength to
SWIR (1.55μm) by using non-linear interferometry. The technique exploits
the interference effects seen in three-wave mixing when pump, signal, and idler
modes make a double pass through a nonlinear crystal. The method allows sensing
at wavelengths where detectors are poor (>3μm) and detection at
wavelengths where photon counting sensitivity can be achieved. In a first
experimental demonstration, we measured a small methane concentration inside a
gas cell with high precision. This interferometer can be built in a compact
design for field operations and potentially enable the detection of low
concentrations of methane at up to 100m range. Signal-to-noise ratio
calculations show that the method can outperform existing short wavelength
(∼1.65μm) integrated path differential absorption direct sensing at
high (>10^-4) non-linear gain.
更多查看译文
AI 理解论文
溯源树
样例
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要