一种用于石英音叉光声检测的前置带通滤波器  

A Pre-bandpass Filter for Photoacoustic Detection of Quartz Tuning Fork

作　　者：郭泽岩 郭锋[1] 孟祥翰 汪润东 童子洋 GUO Zeyan;GUO Feng;MENG Xianghan;WANG Rundong;TONG Ziyang(School of Information Engineering, Southwest University of Science and Technology, Mianyang 621010, China)

机构地区：[1]西南科技大学信息工程学院,四川绵阳621010

出　　处：《压电与声光》2020年第3期390-393,共4页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金面上资助项目(No.61771411)。

摘　　要：针对石英增强光声检测系统中石英音叉共振信号的特征及提取要求,设计了一款六阶切比雪夫有源模拟带通滤波器。根据切比雪夫滤波器理论和Sallen-Key拓扑结构模型完成实际电路的设计,并通过石英音叉共振特性测试实验对滤波器的性能做出了验证。实验结果表明,该滤波器能对石英音叉光声信号进行滤波去噪并无失真放大,其性能指标满足:通频带宽935 Hz,波纹0.8 dB,带外衰减51 dB,品质因数(Q)值35.09,能有效抑制环境噪声,可用于石英增强光声光谱检测领域光声前端信号的处理。A sixth-order Chebyshev active analog bandpass filter is designed for the characteristics and extraction requirements of the quartz tuning fork resonance signal in the quartz enhanced photoacoustic detection system.The actual circuit design is completed according to the Chebyshev filter theory and the Sallen-Key topology structure model,and the performance of the filter is verified through a quartz tuning fork resonance characteristic test experiment.The experimental results show that this filter can filter and de-noise the quartz tuning fork photoacoustic signal without distortion amplification.The specifications of the filter are that the passband is 935 Hz,ripple is 0.8 dB,out-of-band attenuation is 51 dB,and Q value is 35.09,which can effectively suppress ambient noise and can be used for processing photoacoustic front-end signals in the field of quartz enhanced photoacoustic spectrum detection.

关 键 词：光声检测 石英音叉 带通滤波器 共振特性 带外衰减 

分 类 号：TN713[电子电信—电路与系统] TM229.1[一般工业技术—材料科学与工程]