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水体叶绿素a光学传感器信号调理电路设计与测试 被引量:5

Signal Conditioning Circuit Design and Test of Chlorophyll a Optical Sensor of Water
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摘要 为了将水体叶绿素a光学传感器光通路微弱的荧光信号转换为能够满足模数转换器件输入要求的稳定电信号,在前期光通路部分设计的基础上,设计了水体叶绿素a光学智能传感器的信号调理电路部分。该电路包括激发光源驱动模块、光电I/V转换与放大模块、滤波模块、检波模块4部分:对于激发光源驱动模块,采用偏置匹配度高、偏置偏移极小、压差更低的集成驱动芯片,同时驱动多组LED,比传统的限流电阻方案更加稳定、高效,驱动电流也更加一致;设计的光电I/V转换与放大模块,经过I/V转换电路和同相比例放大电路进行了两级放大,相比传统滤波放大电路具有放大交流、抑制直流的特点;在滤波模块,采用单片集成有源滤波器,无需外接电容,与传统的高阶低通滤波器相比,不仅受杂散电容的影响小,而且可以有效减小电路体积;在检波模块,使用了一款具有增量累计转换方式的集成转换器芯片,较之传统的峰值检波电路具有更宽的输出幅度、轨对轨输出、更快的转换速度和更高的转换精度(高达99.75%),而且具有输出直流稳定、温度漂移更小等特点。 In order to convert the weak fluorescence signals in the optical path of water optical sensor for chlorophyll a to stable electrical signals and meet the input requirements of analog-to-digital conversion device, based on the early research on designing the optical path, this paper designed a signal processing circuit in optical intelligent sensor for the chlorophyll a of water. This circuit has four parts, including the excitation light source driver module, the photoelectric I,/V switching and amplifier module, the filtration module and the demodulation module. For excitation light source driver module, we used the integrated driver chip which has the advantages of high bias compatibility, minimum bias and migration and lower dropout voltage to drive multiple LED at the same time. Compared with the traditional current limiting resistor project, the proposed project was more stable, highly effective and more consistent with the driven current. The photoelectric I/V switching and amplifier module which was passed through two-stage amplifier called I/V conversion circuit and the same proportion amplifier circuit respectively, could amplify AC and inhibit DC compared with the traditional filter and amplification circuit. In filtration module, we used the monolithic integrated active filter without external capacitance. Compared with thetraditional high-order low-pass filter, the stray capacitance' s influence was small, and the circuit size can be effectively reduced. In demodulation module, we used an integrated converter chip with incremental accumulating conversion method. Compared with the traditional peak detection circuit, the output amplitude of rail-rail output was wider, the conversion speed was faster and the conversion accuracy was higher (99.75%). It also had more stable output direct current and smaller temperature drift.
出处 《农业机械学报》 EI CAS CSCD 北大核心 2015年第9期314-318,共5页 Transactions of the Chinese Society for Agricultural Machinery
基金 '十二五'国家科技支撑计划资助项目(2012BAD35B07)
关键词 水体叶绿素A 光学传感器 信号调理电路 Chlorophyll a of water Optical sensor Signal conditioning circuit
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参考文献11

  • 1李鑫星,王聪,陈英义,赵佳,傅泽田,张领先.基于荧光分析法的水体叶绿素a传感器光通路设计[J].农业机械学报,2015,46(5):300-305. 被引量:4
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