一种微弱电荷信号的调理电路设计
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摘要
在现代工业、军事等领域,动态测试中冲击的精确测量起到重要的作用。在研究压电加速度传感器的基础上,设计了针对微弱冲击电荷信号的放大及调理电路,并对前级电荷放大电路、后级高通滤波、低通滤波以及放大调理电路进行了逐级分析计算,对压电冲击传感器及电荷放大调理电路进行了整体扫频等测试。经过试验测试,电路在通频带内具有良好的平坦度,在截止频率外,信号急剧衰减,在2倍通频带处衰减可达-60 dB。在高温60℃、低温-40℃环境下,输出振幅偏差小于3%,已成功应用于工程实践中。
An accurate measurement of shocked signal in dynamic test played an import role in modern industry area and military field.This paper showed a design of weak charge signal conditioning circuit based on researching the piezoelectricity type acceleration instrument.The front-stage charge amplification circuit,back-stage high-pass filter,low-pass filter and amplification conditioning circuit were analyzed and calculated step by step.The piezoelectric impact sensor and the charge amplification and conditioning circuit were tested.The test results show that the circuit has a good flatness in the pass-band,and the signal attenuates sharply outside the cut-off frequency,and the attenuation can reach-60 db at the double pass-band.In the high temperature 60 ℃ and-40 ℃ low temperature environment,the output amplitude deviation is less than 3%,has been successfully applied in engineering practic.
An accurate measurement of shocked signal in dynamic test played an import role in modern industry area and military field.This paper showed a design of weak charge signal conditioning circuit based on researching the piezoelectricity type acceleration instrument.The front-stage charge amplification circuit,back-stage high-pass filter,low-pass filter and amplification conditioning circuit were analyzed and calculated step by step.The piezoelectric impact sensor and the charge amplification and conditioning circuit were tested.The test results show that the circuit has a good flatness in the pass-band,and the signal attenuates sharply outside the cut-off frequency,and the attenuation can reach-60 db at the double pass-band.In the high temperature 60 ℃ and-40 ℃ low temperature environment,the output amplitude deviation is less than 3%,has been successfully applied in engineering practic.
引文
[1] 张中才.大量程高频压电加速度传感器设计技术研究[D].北京:中国工程物理研究院,2008.
[2] 陈星龙,姜向东.新型三维压电加速度传感器的设计[J].压电与声光,2007,29(3):286-288.
[3] 李成刚,尤晶晶,吴洪涛.并联式六维加速度传感器动力学模型研究[J].压电与声光,2011,33(6):898-900.
[4] 陶玉贵,压电加速度传感器测量电路的研究与开发[D].合肥:安徽大学,2007.
[5] 田慧,栗保明.压电式压力传感器的测量与标定系统[J].新特器件应用,2009,10(9):3-6.
[6] 李勇,艾竹君,刘巧云.一种新型电荷放大器的设计方法与电路[J].合肥工业大学学报,2006,29(12):1609-1612.
[7] 隋秀香,李相方.用MAX293实现切比雪夫低通滤波的电路设计[J].仪石油仪器,2004,18(6):43-45.
[8] 甄国涌,储俊.一种小信号放大测量电路的设计[J].电测与仪表,2015,52(4):96-100.
[9] 刘俊,刘京诚,李敏.准静态电荷放大器的研究[J].压电与声光,2007,29(2):156-157.
[2] 陈星龙,姜向东.新型三维压电加速度传感器的设计[J].压电与声光,2007,29(3):286-288.
[3] 李成刚,尤晶晶,吴洪涛.并联式六维加速度传感器动力学模型研究[J].压电与声光,2011,33(6):898-900.
[4] 陶玉贵,压电加速度传感器测量电路的研究与开发[D].合肥:安徽大学,2007.
[5] 田慧,栗保明.压电式压力传感器的测量与标定系统[J].新特器件应用,2009,10(9):3-6.
[6] 李勇,艾竹君,刘巧云.一种新型电荷放大器的设计方法与电路[J].合肥工业大学学报,2006,29(12):1609-1612.
[7] 隋秀香,李相方.用MAX293实现切比雪夫低通滤波的电路设计[J].仪石油仪器,2004,18(6):43-45.
[8] 甄国涌,储俊.一种小信号放大测量电路的设计[J].电测与仪表,2015,52(4):96-100.
[9] 刘俊,刘京诚,李敏.准静态电荷放大器的研究[J].压电与声光,2007,29(2):156-157.