太赫兹探测器读出电路设计
发布时间：2018-08-27 19:41
【摘要】：太赫兹波(THz)是一种介于微波和红外区域的电磁波(EMW),其频谱跨越从0.01毫米到3毫米(0.1太赫兹~30太赫兹)。由于其特殊的性质,如低能量、高渗透性和对较大极性分子的特殊吸收,使得太赫兹探测和成像技术在各种领域拥有广阔的应用潜力,比如疾病检查、易爆物和武器检测、飞机的无损检测等。本论文对太赫兹热释电探测原理进行了深入研究,探索了热释电太赫兹探测器的设计以及性能测试相关技术。论文主要的研究内容如下:一、基于钽酸锂晶体的热释电效应,设计了一种封装结构紧凑、信噪比优良的单元热释电太赫兹探测器。单元探测器电路采用电流放大模式,通过合理设计和优化,使敏感元的热电转化率最大;同时,探测器采用敏感元与电路结构两者独立封装,这样非常有效地降低了电磁干扰。二、设计了32像素热释电太赫兹线列探测器电路。该电路将32路敏感元输出信号分为8组,每组4路信号采用基于AD8627四运放芯片的三级运放结构,各路信号从同一块芯片的不同门输入。这样的设计最大程度使得保证了线列放大电路每一路的一致性,同时便于后期测试和调整,简化了线列电路在印刷电路板(PCB)上的布局,有效地减小电路板的尺寸。此外,为屏蔽电磁干扰,设计了线列敏感元金属夹具。三、搭建了太赫兹线列探测器单元响应测试平台以及单元噪声测试平台,对所制作的太赫兹探测器进行了系统检测,并通过相关原理分析了响应电压以及噪声功率谱密度的结果。
[Abstract]:Terahertz wave (THz) is an electromagnetic wave (EMW), between microwave and infrared region whose spectrum spans from 0. 01 mm to 3 mm (0. 1 THz to 30 THz). Because of its special properties, such as low energy, high permeability and special absorption of larger polar molecules, terahertz detection and imaging technology has broad application potential in various fields, such as disease detection, explosive detection and weapon detection. Nondestructive testing of aircraft, etc. In this paper, the principle of terahertz pyroelectric detection is deeply studied, and the design of pyroelectric terahertz detector and the related technology of performance test are explored. The main contents of this paper are as follows: firstly, based on the pyroelectric effect of lithium tantalate crystal, a compact packaging structure and good SNR unit pyroelectric terahertz detector is designed. The unit detector circuit adopts the current amplification mode, through reasonable design and optimization, the thermoelectric conversion rate of the sensor is maximized. At the same time, the detector adopts the sensor element and the circuit structure to package independently, which reduces the electromagnetic interference very effectively. Secondly, the 32 pixel pyroelectric terahertz line detector circuit is designed. The output signal of 32 sensitive elements is divided into 8 groups. Each group of 4 channels signal is composed of three stage operation amplifier structure based on AD8627 quad-op amplifier chip. Each signal is input from different gate of the same chip. This design maximizes the consistency of each line amplifier circuit, facilitates later test and adjustment, simplifies the layout of the line circuit on the printed circuit board (PCB), and effectively reduces the size of the circuit board. In addition, in order to shield the electromagnetic interference, the wire sensitive element metal fixture is designed. Thirdly, the terahertz line detector unit response test platform and the unit noise test platform are built, and the terahertz detector is systematically detected. The results of response voltage and noise power spectral density are analyzed by correlation principle.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：O441.4
本文编号：2208263
[Abstract]:Terahertz wave (THz) is an electromagnetic wave (EMW), between microwave and infrared region whose spectrum spans from 0. 01 mm to 3 mm (0. 1 THz to 30 THz). Because of its special properties, such as low energy, high permeability and special absorption of larger polar molecules, terahertz detection and imaging technology has broad application potential in various fields, such as disease detection, explosive detection and weapon detection. Nondestructive testing of aircraft, etc. In this paper, the principle of terahertz pyroelectric detection is deeply studied, and the design of pyroelectric terahertz detector and the related technology of performance test are explored. The main contents of this paper are as follows: firstly, based on the pyroelectric effect of lithium tantalate crystal, a compact packaging structure and good SNR unit pyroelectric terahertz detector is designed. The unit detector circuit adopts the current amplification mode, through reasonable design and optimization, the thermoelectric conversion rate of the sensor is maximized. At the same time, the detector adopts the sensor element and the circuit structure to package independently, which reduces the electromagnetic interference very effectively. Secondly, the 32 pixel pyroelectric terahertz line detector circuit is designed. The output signal of 32 sensitive elements is divided into 8 groups. Each group of 4 channels signal is composed of three stage operation amplifier structure based on AD8627 quad-op amplifier chip. Each signal is input from different gate of the same chip. This design maximizes the consistency of each line amplifier circuit, facilitates later test and adjustment, simplifies the layout of the line circuit on the printed circuit board (PCB), and effectively reduces the size of the circuit board. In addition, in order to shield the electromagnetic interference, the wire sensitive element metal fixture is designed. Thirdly, the terahertz line detector unit response test platform and the unit noise test platform are built, and the terahertz detector is systematically detected. The results of response voltage and noise power spectral density are analyzed by correlation principle.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：O441.4
【参考文献】
相关硕士学位论文 前2条
1 孙红起;太赫兹时域光谱系统的性能研究[D];首都师范大学;2007年
2 焦月英;连续太赫兹波成像技术的研究[D];首都师范大学;2008年
，本文编号：2208263
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