| 可变增益放大器在脉冲振幅调制式藻类光合活性荧光测量中的应用 |
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| 引用本文： | 刘晶,刘文清,张玉钧,赵南京,殷高方,钟留勇,段静波,凌六一.可变增益放大器在脉冲振幅调制式藻类光合活性荧光测量中的应用[J].光学与光电技术,2011(5):48-51. |
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| 作者姓名： | 刘晶 刘文清 张玉钧 赵南京 殷高方 钟留勇 段静波 凌六一 |
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| 作者单位： | 中国科学院安徽光学精密机械研究所;中国科学技术大学地球与空间学院 |
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| 摘 要： | 微弱信号探测中信号幅度很宽会导致幅度小的信号分辨率低,结合脉冲振幅调制叶绿素光合活性荧光仪中不同强度光源激发下光电倍增管光电流响应,采用多路选择开关D5201G芯片选择I/V转换电路中不同阻值的反馈电阻实现了对输入信号可变增益放大.0～118mV以下输入信号的理论增益值最高可达28.25 dB,同时输入信号的电压幅值最...
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| 关 键 词： | 可变增益 信号探测 叶绿素荧光 |
Variable Gain Amplifier Used in Fluorescence Signal Detection of Chlorophyll Activity Based on Pulse Amplitude Modulation |
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| LIU Jing,LIU Wen-qing,ZHANG Yu-jun ZHAO Nan-jing,YIN Gao-fang,ZHONG Liu-yong,DUAN Jing-bo,LING Liu-yi.Variable Gain Amplifier Used in Fluorescence Signal Detection of Chlorophyll Activity Based on Pulse Amplitude Modulation[J].optics&optoelectronic technology,2011(5):48-51. |
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| Authors: | LIU Jing LIU Wen-qing ZHANG Yu-jun ZHAO Nan-jing YIN Gao-fang ZHONG Liu-yong DUAN Jing-bo LING Liu-yi |
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| Institution: | 1 (1 Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230031,China; 2 School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China) |
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| Abstract: | Detection of weak signals is often encountered in greate range of amplitude,so it would lead to small signal low resolution.Pulse amplitude modulated chlorophyll fluorescence in photosynthetic activity of different intensity excitation light photocurrent response by photomultiplier tube is intnoduced in this paper.Multiple selector switch D5201G chip and HC 374 are used to select different values of feedback resistor in I/V conversion which work as a variable gain amplifier.The theoretical gain of input signal under 0～118 mV is up to 28.25 dB,while the input signal amplitude would be up to 11.11 V. |
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| Keywords: | variable gain amplifier signal detection chlorophyll fluorescence |
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