太赫兹特征谱线精细化检测识别技术及应用OA

High-resolution terahertz characteristic spectral lines can reveal more physical and chemical properties of substances.Existing detection and identification techniques for terahertz characteristic spectral lines mostly suffer from trade-offs among measurement bandwidth,dynamic range,and frequency resolution,making them difficult to meet practical testing requirements.To address the application needs for mixed substance composition analysis and high-sensitivity detection and identification of water-containing substances such as living tumor cells,this paper proposes a fine detection and identification system for terahertz characteristic spectral lines based on time-division multiplexing.Through spatial beam shaping and control,fine detection and identification of terahertz characteristic spectral lines and characteristic parameters in the 110～1 100 GHz band have been achieved,with a spectral line detection resolution of≤1 kHz,a relative permittivity measurement error of≤±5%,and a system dynamic range of≥60 dB.Experimental results show that the system can achieve mixed substance composition analysis and high-sensitivity detection and identification of water-containing substances such as living tumor cells.