谐振腔声气体传感器的电路模型与计算机仿真  

Electrical Modeling and Simulation of a Resonant Acoustic Gas Sensor

作　　者：章婷[1] 

机构地区：[1]武汉数字工程研究所,武汉430074

出　　处：《计算机与数字工程》2009年第6期159-162,共4页Computer & Digital Engineering

摘　　要：提出了一种谐振腔声气体传感器的等效电路修正模型。该模型将FMYB和Babak模型相结合，运用谐振腔与传输线的相似性、Babak模型利用LC回路等效声谐振腔的谐振频率，电阻变化模拟气体粘滞性和反射界面损失的基础上，提出将谐振腔气流损失等效为一定大小的负载电阻，使得新模型能够精确模拟不同气体浓度的声阻抗和谐振频率变化。实验表明：新模型在38．5～41．0KHz频率范围内不仅能模拟声气体传感器的阻抗变化趋势，而且能精确地计算声气体传感器的阻抗值，从而得出相应的气体浓度变化。A modified equivalent circuit model of an acoustic gas sensor with resonator is introduced in this paper. Based on FMYB and Babak models, our modified RCL- link model simulates the impedance curve in terms of amplitude and resonant frequency well. In the new model resonator is equivalent to RCL-link and the characteristics of acoustic radiation is also included. It not only tells the trend of an impedance curve, but also gives the value exactly incertain frequency range from 38.5~41.5KHz. This modeling would be a helpful step to the gas mixture measurement and analysis. FB-mod- ified model not only tells the trend of an impedance curve, but also gives the value exactly in frequency range from 38.5- 41.5KHz.

关 键 词：声气体传感器 电路模型 仿真 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]