该文探讨了一种新型的红外-太赫兹双共振光谱技术在远程识别痕量气体方面的实用性。这种技术依赖于已知的分子参数来识别特定的分析物。大气压力展宽了红外和太赫兹痕量气体谱线，放松了泵浦同步要求，允许在500GHz以下的有利大气传输窗口中激发多个双共振信号。通过设计双共振光谱仪并进行详细的信号分析，估计了在长达1公里的距离上检测甲基氟化物、甲基氯化物或甲基溴化物所需的泵浦和探测功率。双共振信号强度随泵浦强度线性增加，但探测功率仅按平方根增加，因为接收到的信号处于汤斯噪声极限。此外，提出了特异性矩阵的概念，用于量化识别特异性和计算干扰物的假阳性检测概率。
Abstract
The practicality of a newly proposed infrared-terahertz (IR-THz) double-resonance (DR) spectroscopic technique for remote trace-gas identification is explored. The strength of the DR signatures depends on known molecular parameters from which a combination of pump-probe transitions may be identified to recognize a specific analyte. Atmospheric pressure broadening of the IR and THz trace-gas spectra relaxes the stringent pump coincidence requirement, allowing many DR signatures to be excited, some of which occur in the favorable atmospheric transmission windows below 500 GHz. By designing the DR spectrometer and performing a detailed signal analysis, the pump-probe power requirements for detecting trace amounts of methyl fluoride, methyl chloride, or methyl bromide may be estimated for distances up to 1 km. The strength of the DR signature increases linearly with pump intensity but only as the square root of the probe power because the received signal is in the Townes noise limit. The concept of a specificity matrix is introduced and used to quantify the recognition specificity and calculate the probability of false positive detection of an interferent.
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