基于对数放大器的微弱信号检测系统
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摘要
为解决微弱光信号检测中信号动态范围宽及噪声干扰等问题,设计一种由对称晶体管等分立元件组成的对数放大器.用方波信号对该对数放大器的输入、输出及频率特性进行分析,结果表明在输入信号频率低于13 Hz时,放大器有很好的放大特性,输入信号动态范围达60 dB,小信号增益最高可达到90 dB.使用该对数放大器设计了微弱光信号检测系统,针对检测系统存在的误差问题,基于电路放大关系编写算法,该算法能有效减小系统的输出误差.实验结果表明该系统能有效检测微弱信号.
In order to solve the problems of signal characterized by wide dynamic range and big noise in weak optical signal detection, we designed a logarithmic amplifier which composed of symmetrical transistor and other discrete components. In addition, the square wave signal was used to research the characteristics of input, output and frequency of the logarithmic amplifier. The results showed that logarithmic amplifiers had better amplification effects when the frequency was under 13 Hz, the gain of small-signal is up to 90 dB and the range of dynamic could reach 60 dB. In this paper, a weak optical signal detection system was designed using logarithmic amplifiers and in order to solve the error problem, an algorithm was presented by using the circuit amplification relation. This algorithm could effectively reduce the output error of the system. The experimental results showed that the system could detect weak signals effectively.
In order to solve the problems of signal characterized by wide dynamic range and big noise in weak optical signal detection, we designed a logarithmic amplifier which composed of symmetrical transistor and other discrete components. In addition, the square wave signal was used to research the characteristics of input, output and frequency of the logarithmic amplifier. The results showed that logarithmic amplifiers had better amplification effects when the frequency was under 13 Hz, the gain of small-signal is up to 90 dB and the range of dynamic could reach 60 dB. In this paper, a weak optical signal detection system was designed using logarithmic amplifiers and in order to solve the error problem, an algorithm was presented by using the circuit amplification relation. This algorithm could effectively reduce the output error of the system. The experimental results showed that the system could detect weak signals effectively.
引文
[1] 李常青, 杨晓娅. 对数积分放大器在弱光检测中的研究与应用[J]. 应用光学, 2014 (4): 648-651.
[2] 杨晓娅. 微弱光信号检测系统的设计与研究[D]. 郑州: 郑州大学信息工程学院, 2014.
[3] 陈伟, 黄芮, 林师善, 等. 基于Launchpad微弱信号检测装置的探究[J]. 电子技术应用, 2013, 39 (9): 38-40.
[4] 戈文杰, 喻杰奎, 胡强高, 等. 微弱光信号检测系统的研究[J]. 光通信研究, 2013, 39 (3): 51-53.
[5] 赵硕峰, 张娟. 基于LabVIEW平台的嵌入式光谱强度检测系统设计[J]. 电子技术应用, 2017, 43 (6): 90-93.
[6] 刘许, 宋阳. 一种基于移动最小二乘法的点云数据孔洞修补算法研究[J]. 现代电子技术, 2017, 40 (5): 101-104.
[7] 陆一. 对数放大器直流漂移抑制方法研究[J]. 微电子学, 2016, 46 (2): 187-189.
[8] 陆一, 何卫国. 真对数放大器原理及特性分析[J]. 微电子学, 2011, 41 (1): 48-52.
[9] 王开宇. 基于C#的数据与视频监控上位机软件设计[J]. 现代电子技术, 2017, 40 (10): 62-64.
[10] 何玲玲. 微弱光电信号采集与处理系统的研究[D]. 合肥: 安徽大学电气工程与自动化学院, 2010.
[11] 黄琳, 龚治宇, 孟祥隆, 等. 井下地层流体NMR分析仪微弱信号放大电路设计[J]. 仪表技术与传感器, 2017 (2): 27-30.
[12] DERAFSHI Z H, FROUNCHI J. Low-noise low-power front-endlogarithmic amplifier for neural recording system[M]. New York: John Wiley and Sons Ltd, 2014.
[13] ANGELINI E, CORBELLINI S, PARVIS M, et al. An Arduino-based EIS with a logarithmic amplifier for corrosion monitoring[C]//Instrumentation and Measurement Technology Conference, 2014: 905-910.
[2] 杨晓娅. 微弱光信号检测系统的设计与研究[D]. 郑州: 郑州大学信息工程学院, 2014.
[3] 陈伟, 黄芮, 林师善, 等. 基于Launchpad微弱信号检测装置的探究[J]. 电子技术应用, 2013, 39 (9): 38-40.
[4] 戈文杰, 喻杰奎, 胡强高, 等. 微弱光信号检测系统的研究[J]. 光通信研究, 2013, 39 (3): 51-53.
[5] 赵硕峰, 张娟. 基于LabVIEW平台的嵌入式光谱强度检测系统设计[J]. 电子技术应用, 2017, 43 (6): 90-93.
[6] 刘许, 宋阳. 一种基于移动最小二乘法的点云数据孔洞修补算法研究[J]. 现代电子技术, 2017, 40 (5): 101-104.
[7] 陆一. 对数放大器直流漂移抑制方法研究[J]. 微电子学, 2016, 46 (2): 187-189.
[8] 陆一, 何卫国. 真对数放大器原理及特性分析[J]. 微电子学, 2011, 41 (1): 48-52.
[9] 王开宇. 基于C#的数据与视频监控上位机软件设计[J]. 现代电子技术, 2017, 40 (10): 62-64.
[10] 何玲玲. 微弱光电信号采集与处理系统的研究[D]. 合肥: 安徽大学电气工程与自动化学院, 2010.
[11] 黄琳, 龚治宇, 孟祥隆, 等. 井下地层流体NMR分析仪微弱信号放大电路设计[J]. 仪表技术与传感器, 2017 (2): 27-30.
[12] DERAFSHI Z H, FROUNCHI J. Low-noise low-power front-endlogarithmic amplifier for neural recording system[M]. New York: John Wiley and Sons Ltd, 2014.
[13] ANGELINI E, CORBELLINI S, PARVIS M, et al. An Arduino-based EIS with a logarithmic amplifier for corrosion monitoring[C]//Instrumentation and Measurement Technology Conference, 2014: 905-910.