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Enhancement of trace gas detection by integrating wavelength modulated spectra across multiple lines

机译：通过整合多条线中的波长调制光谱来增强痕量气体检测

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摘要

We describe and demonstrate a technique that enhances the sensitivity of a spectrometer for trace gas detection by employing wavelength modulation spectroscopy (WMS) and integrating the absolute value of the recorded spectra across multiple lines of the species. The sensitivity is further enhanced by conducting WMS with large modulation depths. This technique is demonstrated using a continuously tunable external cavity CW quantum cascade laser to record the second harmonic wavelength modulated spectra of NO_(2) across the peak of the R-branch from 1629.5 to 1633.9 cm~(-1). By integrating the absolute value of the resulting spectra, the detection sensitivity of NO_(2) is improved by a factor of 40 compared to the sensitivity achieved using single-line WMS with the same apparatus. By using this technique, we achieve a sensitivity of approximately 6 parts in 10~(9) (ppb) using a short-path cell (a 1 m absorption cell with two passes).
机译：我们描述并演示了一种技术，该技术可通过使用波长调制光谱（WMS）并跨物种的多条线对记录的光谱的绝对值进行积分来提高用于痕量气体检测的光谱仪的灵敏度。通过执行具有较大调制深度的WMS，可以进一步提高灵敏度。利用连续可调外腔CW量子级联激光器对该技术进行了记录，记录了R分支的峰值从1629.5到1633.9 cm〜（-1）的NO_（2）的二次谐波波长调制光谱。通过对所得光谱的绝对值进行积分，与使用单线WMS在同一设备上获得的灵敏度相比，NO_（2）的检测灵敏度提高了40倍。通过使用此技术，我们使用短程比色皿（一个具有两次通过的1 m吸收比色皿）在10〜（9）（ppb）中获得大约6份的灵敏度。

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