【摘要】：太赫茲波(THz)是一種介于微波和紅外區(qū)域的電磁波(EMW),其頻譜跨越從0.01毫米到3毫米(0.1太赫茲~30太赫茲)。由于其特殊的性質(zhì),如低能量、高滲透性和對較大極性分子的特殊吸收,使得太赫茲探測和成像技術(shù)在各種領(lǐng)域擁有廣闊的應(yīng)用潛力,比如疾病檢查、易爆物和武器檢測、飛機的無損檢測等。本論文對太赫茲熱釋電探測原理進行了深入研究,探索了熱釋電太赫茲探測器的設(shè)計以及性能測試相關(guān)技術(shù)。論文主要的研究內(nèi)容如下:一、基于鉭酸鋰晶體的熱釋電效應(yīng),設(shè)計了一種封裝結(jié)構(gòu)緊湊、信噪比優(yōu)良的單元熱釋電太赫茲探測器。單元探測器電路采用電流放大模式,通過合理設(shè)計和優(yōu)化,使敏感元的熱電轉(zhuǎn)化率最大;同時,探測器采用敏感元與電路結(jié)構(gòu)兩者獨立封裝,這樣非常有效地降低了電磁干擾。二、設(shè)計了32像素?zé)後岆娞掌澗�列探測器電路。該電路將32路敏感元輸出信號分為8組,每組4路信號采用基于AD8627四運放芯片的三級運放結(jié)構(gòu),各路信號從同一塊芯片的不同門輸入。這樣的設(shè)計最大程度使得保證了線列放大電路每一路的一致性,同時便于后期測試和調(diào)整,簡化了線列電路在印刷電路板(PCB)上的布局,有效地減小電路板的尺寸。此外,為屏蔽電磁干擾,設(shè)計了線列敏感元金屬夾具。三、搭建了太赫茲線列探測器單元響應(yīng)測試平臺以及單元噪聲測試平臺,對所制作的太赫茲探測器進行了系統(tǒng)檢測,并通過相關(guān)原理分析了響應(yīng)電壓以及噪聲功率譜密度的結(jié)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.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：O441.4

【參考文獻】

相關(guān)碩士學(xué)位論文 前2條

1 孫紅起;太赫茲時域光譜系統(tǒng)的性能研究[D];首都師范大學(xué);2007年

2 焦月英;連續(xù)太赫茲波成像技術(shù)的研究[D];首都師范大學(xué);2008年

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本文編號：2208263