本文關鍵詞： 光電檢測 光電倍增管模塊 電流放大器 藍寶石底座 EAST　出處：《合肥工業(yè)大學》2017年碩士論文　論文類型：學位論文

【摘要】：光電檢測系統(tǒng)是光電檢測設備的重要組成部分,主要由光電探測器和電流放大器兩部分構成。光電探測器將待測光信號轉化為電流信號,電流放大器將探測器輸出的電流信號轉化為電壓信號并進行放大。為了完成對比較微弱且持續(xù)時間較短的光信號的精確測量,在設計過程中需要權衡光電檢測系統(tǒng)的增益、帶寬和噪聲。本文調研了國內外光電檢測系統(tǒng)的研究現(xiàn)狀,詳細分析了其工作原理、組成器件和設計難點,設計出精度較高的光電檢測系統(tǒng)。系統(tǒng)選用光電倍增管(PMT)作為光電探測器,相比于其他光電探測器,其具有超高的內部增益、較高的靈敏度和較短的響應時間等特性。電流放大器由前置放大器和電壓放大器構成,其中前置放大器的設計是難點。分別采用印刷電路板(PCB)和藍寶石材料作為電流放大器的基板,探究兩種材料對電路的影響并在實驗室做了對比測試。當電流放大器(增益為106V/A)輸入端短接后,兩種基板電路輸出噪聲峰峰值大約為3mV。另外,在無光信號輸入的情況下,保持光電檢測系統(tǒng)的整體增益和帶寬不變,測量了不同增益配比下的輸出噪聲。當PMT模塊的控制電壓為0.49V,基于藍寶石底座的電流放大器增益為2×105V/A時,系統(tǒng)輸出噪聲較低,峰峰值大約為4.56 mV。2016年冬季,該光電檢測系統(tǒng)在先進實驗托卡馬克(EAST)裝置的filterscope診斷系統(tǒng)中得以測試。實驗數(shù)據(jù)表明,該光電檢測系統(tǒng)能夠檢測到不同頻率的邊緣局域模(ELM)事件以及頻率在~kHz量級的邊際震蕩,為準確研究ELM行為和H-mode等離子體提供幫助。
[Abstract]:Photoelectric detection system is an important part of photoelectric detection equipment, mainly composed of two parts: photoelectric detector and current amplifier. The photoelectric detector converts the light signal to current signal. The current amplifier converts the current signal from the detector into a voltage signal and amplifies it. In the process of design, we need to weigh the gain, bandwidth and noise of the photoelectric detection system. This paper investigates the research status of photoelectric detection system at home and abroad, analyzes its working principle, components and design difficulties in detail. A photoelectric detection system with high precision is designed. PMTs are used as photodetectors. Compared with other photodetectors, PMTs have super-high internal gain. High sensitivity and short response time. The current amplifier consists of a preamplifier and a voltage amplifier. The design of preamplifier is difficult. PCB (printed circuit board) and sapphire are used as the substrate of current amplifier. The effects of the two materials on the circuit were investigated and tested in the laboratory when the current amplifier (gain 106V / A) input was short-connected. The peak output noise peak of the two substrates is about 3 MV. In addition, the overall gain and bandwidth of the photoelectric detection system are kept unchanged without light input. When the control voltage of PMT module is 0.49V and the gain of current amplifier based on sapphire base is 2 脳 105V / A, the output noise of the system is low. The peak value is about 4.56 mV.2016 in winter. The photoelectric detection system has been tested in the filterscope diagnostic system of the advanced experimental Tokamak EAST device. The photoelectric detection system can detect edge local mode (ELM) events with different frequencies and marginal oscillations of frequency in the order of kHz. It is helpful for the accurate study of ELM behavior and H-mode plasma.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN15

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