太赫兹时域光谱高效实时检测的电子学关键技术研究

太赫兹光谱技术在基础物理实验、微观结构表征和复合材料无损检测等领域具有广泛的应用前景；基于异步光学采样的太赫兹时域光谱技术（ASOPS-THz-TDS），是无损检测探测器、实验电路和器材的有效途径。然而，ASOPS-THz-TDS系统检测的时间长、灵敏度低，是限制该技术实现巨大应用价值的瓶颈。.因此，本项目从高速高精度电子学、稳频稳相异步光学采样、FPGA实时处理等关键技术出发，研制一套针对ASOPS-THz-TDS弱信号检测的电子学系统，突破太赫兹无损检测时间长、灵敏度低的瓶颈。创新性地提出将高速相关采样技术和稳频稳相异步光学采样技术结合的方法，实现THz信号的高分辨率、高灵敏度、快速扫描检测。同时，本项目拟将高速数字化技术和高性能的FPGA并行处理技术结合，开展基于数字逻辑的并行处理算法研究，在FPGA中实时重建THz时域波形，并根据靶标材料THz“特征波形”，实时预判材料是否有缺陷。

Terahertz spectroscopy is widely used in the fields of fundamental physics experiments, microstructure detection and nondestructive testing of composite materials. Terahertz time domain spectroscopy based on asynchronous optical sampling (ASOPS-THz-TDS), is an effective way for nondestructive testing of detectors, experimental circuits and equipment. However, long measuring time and low processing efficiency of the traditional THz-TDS becomes the bottleneck restricting the application of this technology..Therefore, this research project focuses on the novel techniques and approaches of THz detection, a new scheme of ultra-fast nondestructive testing for composite materials was established through the breakthrough of key technologies such as high-speed high-precision electronics, stable-frequency stable-phase asynchronous optical sampling (ASOPS), THz signals real-time processing. An innovative method combining high speed correlation sampling technology with stable-frequency stable-phase ASOPS technology is proposed to realize high resolution, high sensitivity and rapid repetitive measurement of THz signal. At the same time, this project combines high-speed digital technology and high-performance FPGA parallel processing technology to develop a waveform parallel processing algorithm based on digital logic. Real-time reconstruction of the THz time domain waveform in FPGA，according to the characteristics of the target material THz signal, research the real-time algorithm to determine whether the material is defective. Based on the above mentioned, this project can realize the ultra-fast nondestructive testing of composite materials with high resolution and high sensitivity, the development of our project will enhance the research and technological innovation in the field of terahertz non-destructive detection.