THz探测器作为THz成像系统的核心器件,一定程度上制约着THz成像技术的发展,鉴于单元/多元探测器的光机扫描成像模式存在的问题,THz 焦平面探测器成像成为 THz 探测技术发展的方向.介绍了近年来国内外在THz焦平面探测器,特别是基于VOx的THz焦平面探测器及其成像技术的研究进展,分析了 THz 焦平面探测器及其成像模式的发展前景.本文对于研究 THz 成像技术及应用的发展具有重要的参考意义.

As the core device of the THz imaging system, the development of THz detectors restricts the development of THz imaging technology. Because there are many problems in the unit/multiple-detector optical mechanical scanning imaging mode, THz focal plane array (FPA) detector imaging becomes the development direction of the THz detection technology. This article describes the research advances of the THz focal plane array detectors especially the THz focal plane array detector which based on the VOx uncooled FPA and its imaging technology both at home and abroad in recent years. This paper also analyzes the development prospects of the THz focal plane detector and its imaging mode, the paper has reference significance to the research of the development and application of THz imaging technology.

太赫兹(terahertz，简称THz)检测技术是THz技术应用的一个关键环节，它涉及物理学、材料科学、半导体技术、光电子学和超导电子学，是一门综合性很强的技术。文章介绍了一些比较典型的THz检测技术的原理及其应用，特别是国内学者在这方面的工作。

Terahertz (THz) detection is a key link in the application of THz technology. It is a highly comprehensive technology, involving physics, material science, semiconductor technology, op-toelectronics, and superconducting electronics. This paper introduces the principle and applications of some typical THz detectors, especially with regard to research in China.

随着THz成像技术的日益发展，针对设计清晰、实时、高灵敏度、小型化及低成本THz成像系统还比较困难的问题，从设计THz成像系统的角度出发，就其在成像方面的特点、工作原理、组成及关键技术（包括THz光学系统、探测器及信号处理）进行了研究，着重研究了目前THz成像系统的新进展。并分析比较了电磁波段中γ、X、紫外、可见光、微光、红外、THz及毫米波各成像系统的优缺点及应用。在THz成像系统的典型应用基础上提出了THz成像系统未来发展方向。

With the increasing development of THz imaging technology, this article, aiming at the problem which is more difficult to design a clear, real time, high sensitivity, miniaturization and low-cost THz imaging system, from the view of designing of THz imaging system, studies imaging characteristics, operating principle, composition and key technologies (including THz optical system, detector and weak signal processing)and focuses on the current progress of THz imaging system. And the advantages, disadvantages and application of the imaging systems, which includeγ, X, ultraviolet, visible, low-light-level, infrared, THz and millimeter wave in the electromagnetic spectrum, are compared and analyzed. Based on typical applications, the future development direction of THz imaging system is proposed. This work plays a significant role in the study and design of THz imaging.

太赫兹时域光谱（terahertz time domain spectroscopy，简称THz-TDS）技术是基于飞秒激光技术的新型光谱测量技术，它通过物质在THz波段的吸收特征可有效分析物质的结构和成分等相关信息。针对食品安全检测需求，采用THz-TDS技术进行了典型食品添加剂和非法添加剂的THz波谱分析与鉴别研究，测量分析了常用食品防腐剂苯甲酸和山梨酸、食品营养增补剂L-丙氨酸、食品调味剂L-谷氨酸钠，以及常被非法应用于食品增色的工业原料苏丹红I号在室温氮气环境下的THz吸收谱和折射率谱。研究发现这五类物质在THz波段均存在明显吸收峰，并具有指纹特性，可实现有效鉴别。应用Gussian03W程序包，基于密度泛函理论理论进一步模拟了 L-丙氨酸分子的振动来源，并对其在 THz波段的吸收峰进行了分析指认，为检测鉴别实验的可行性和有效性提供了理论依据。论文研究获取了典型食品添加THz波谱，分析掌握了各添加剂的THz吸收与折射特性，为食品安全检测提供了一种新方法。

Terahertz time-domain spectroscopy (THz-TDS) is a new spectral technique based on femtosecond laser technology. Through the absorption features of substances in THz band, the structure and composition of substances and other related information can be effectively analyzed. The terahertz spectra of food preservatives benzoic acid and sorbic acid, food nutritional supplement L-alanine, Food flavoring agent L-Glutamic Acid Sodium and illegal food additive Sudan I were got by THz-TDS in the Nitrogen surroundings at room temperature in demands of food safety inspection and assurance. The experimental results show that the THz spectra of these five kinds of food additives have distinct characteristics in THz region, which can be used as the fingerprint spectra and distinguish food additives. Finally, Gussian03W and density functional theory was applied in this research. The vibration source of L-alanine was simulated, and then the absorption of THz spectra of it was analyzed. The study demon

太赫兹(THz)波是有待进行全面研究开发的波段，在高灵敏的 THz 探测技术中，不仅要知道 THz 信号的功率，还要了解THz信号的频率和频谱，研制一种小型的THz频谱分析仪是开发太赫兹科学技术中不可或缺的。本文对高温超导双晶结中晶界对磁通流运动的诱导作用，超导检测器与 THz 波的相互作用进行了研究，利用超导约瑟夫森结对太赫兹波高灵敏的响应，通过 Hilbert变换，研制出了超导小型 THz 频谱检测仪，并对多种太赫兹信号源进行了频谱测量。

Terahertz(THz)is a waveband with great potential for researching and development.With high-sensitivity THz detection techniques,we have to know the THz signal power,its frequency and spectrum.Therefore,it is indis-pensable to develop a kind of miniaturized THz spectrum analyzer.This paper studies the induction of the vortice dynamic by the crystal boundary in the high temperature superconducting bi-crystal j unction,and the interaction of superconducting detector and THz wave.It utilizes the high sensitivity response of superconducting Josephson junction to THz wave and Hilbert transform to develop a miniaturized superconducting THz spectrum detector. Meanwhile,this paper presents the frequency spectrum measurement of multiple THz radiation sources.