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首页> 外文会议>SPIE Conference on Quantum Sensing and Nanophotonic Devices >Infrared QC laser applications to field measurements of atmospherictrace gas sources and sinks in environmental research: enhancedcapabilities using continuous wave QCLs
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Infrared QC laser applications to field measurements of atmospherictrace gas sources and sinks in environmental research: enhancedcapabilities using continuous wave QCLs

机译：红外QC激光器应用于现场测量的大气管道气体源和环境研究中的水槽：使用连续波Qcls的增强性

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The advent of continuous wave quantum cascade lasers operating at near room temperature has greatly expanded the capability of spectroscopic detection of atmospheric trace gases using infrared absorption at wavelengths from 4 to 12 μm. The high optical power, narrow line width, and high degree of single mode purity result in minimal fractional absorptions of 5x10~(-6) Hz~(-1/2) detectable in direct absorption with path lengths up to 210 meters. The Allan plot minima correspond to a fractional absorbance of 1x10~(-6) or a minimum absorption per unit path length 5х10~(-11) cm~(-1) in 50s. This allows trace gas mixing ratio detection limits in the low part-per-trillion (1 ppt = 10~(-12)) range for many trace gases of atmospheric interest. We present ambient measurements of NO_2 with detection precision of 10 ppt Hz~(-1/2). The detection precision for the methane isotopologue ~(13)CH_4 is 25 ppt Hz~(-1/2) which allows direct measurements of ambient ratios of ~(13)CH_4/~(12)CH_4 with a precision of 0.5 %o in 100 s without pre-concentration. Projections are given for detection limits for other gases including COS, HOMO and HCHO as CWRT lasers become available at appropriate wavelengths.
机译：在接近室温下操作的连续波量子级联激光器的出现极大地扩展了在波长4至12μm的波长下使用红外吸收的光谱检测光谱检测能力。高光功率，窄线宽和高度单模纯度导致最小的5×10〜（-6）Hz〜（-1/2）的最小分数吸收，直接吸收，路径长度高达210米。 Allan Plot最小值对应于50S中的1×10〜（-6）的分数吸光度或每单位路径长度5х10〜（-11）cm〜（-1）的最小吸收。这允许痕量气体混合比检测限制在低部分（1 ppt = 10〜（-12））范围内，对于大气感兴趣的许多痕量气体。我们呈现NO_2的环境测量，具有10 ppt Hz〜（-1/2）的检测精度。甲烷同位素〜（13）CH_4的检测精度为25 ppt Hz〜（-1/2），允许直接测量〜（13）CH_4 /〜（12）CH_4的环境比，精度为0.5％O 100秒无浓度。作为在适当的波长下可用的CWRT激光器可用，给出了包含COS，HOMO和HCHO的其他气体的检测限制的突出轮廓。

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