We demonstrate a full-cycle breath gas sensor system based on terahertz/millimeter-wave gas spectroscopy. The sensor consists of a transmitter and receiver working around 250 GHz based on SiGe BiCMOS technology. Typical detection thresholds are in the ppm range depending on the respective molecule. The data analysis provides partial pressures of the investigated molecules by fitting of spectra which are measured by wavelength modulation. Beside the spectroscopic measurement and the data analysis, a full cycle of breath analysis includes the sampling and the conditioning of the sample tubes. The full cycle takes about 35 min per sample in average. As the system is compact and easy to operate, it allows for on-site analysis of breath samples in medical laboratories or hospitals.

中文翻译：

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基于太赫兹/毫米波气体光谱的紧凑型呼吸气体传感器系统

我们展示了一个基于太赫兹/毫米波气体光谱的全周期呼吸气体传感器系统。该传感器由一个基于 SiGe BiCMOS 技术的发射器和接收器组成，工作频率约为 250 GHz。典型的检测阈值在 ppm 范围内，具体取决于相应的分子。数据分析通过拟合通过波长调制测量的光谱来提供所研究分子的分压。除了光谱测量和数据分析，整个呼吸分析周期还包括采样管的采样和调节。整个循环平均每个样品大约需要 35 分钟。由于该系统结构紧凑且易于操作，因此可以在医学实验室或医院对呼吸样本进行现场分析。