Gas sensing by THz wave absorption spectroscopy is demonstrated for several volatile organic compounds (VOCs) using a broadband electronics-based THz wave spectrometer. Spectral absorption is characterized in the frequency range from 220 to 330 GHz for seven VOCs and water vapor in a gas cell at room temperature and pressures of 0.5–10 Torr. Amplitude-modulation is applied to the interrogating radiation, and lock-in detection is used to acquire the transmitted frequency-dependent radiation intensity. For methanol, ethanol, n-propanol, formic acid, formaldehyde, acetaldehyde, acetone, and water vapor, measured transition frequencies agree with literature databases, where available. The present work demonstrates the potential for an all-electronic THz gas sensor for conditions where pressure broadening and line blending occur, as would be found in typical industrial, environmental, and biological gas sensing applications.

中文翻译：

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通过基于微电子的吸收光谱法在 220–330 GHz 进行 VOC 气体传感

使用基于宽带电子技术的太赫兹波光谱仪对几种挥发性有机化合物 (VOC) 进行了太赫兹波吸收光谱的气体传感。在室温和 0.5-10 Torr 的压力下，气室中 7 种 VOC 和水蒸气的光谱吸收在 220 至 330 GHz 的频率范围内表征。对询问辐射应用调幅，并使用锁定检测来获取发射频率相关的辐射强度。对于甲醇、乙醇、正丙醇、甲酸、甲醛、乙醛、丙酮和水蒸气，测量的跃迁频率与可用的文献数据库一致。目前的工作证明了全电子太赫兹气体传感器在压力展宽和线混合发生的条件下的潜力，