基于声谐振驱动的氢气流量检测系统设计与实现

Based on Acoustic Resonance Drive Hydrogen Flow Detection System Design and Implement

氢气在空气中的爆炸极限浓度较低,当前电化学传感器氢气检测中容易受到电磁干扰引起爆炸,安全系数低;设计并实现了一种基于声谐振频率驱动的氢气流量检测系统设计方法,通过检测不同浓度的氢气通过传感器后引起的传感器谐振频率的变化反应氢气的浓度变化,系统基于S3C2410模块设计,设计了外围的信号调理电路,对芯片进行了Linux系统移植,安全性和准确性都有很大提高;最后进行仿真实验,实验工具包括传感器与探头,芯片搭建的硬件电路,USB数据采集卡;型号分别为1%,2.54%,3.05%,4.1%的经过国家标准检验的氢气,型号为0.513%的一氧化碳,型号为100%的二氧化碳与氧气;实验结果表明,系统能在10s内对超浓度的氢气流量监控报警,误差在小于0.015,不同的交叉气体下系统的氢气流量检测准确度高达98%,具有很强的实用性。

Hydrogen in the lower explosion limit concentration in the air, the electrochemical sensor susceptible to electromagnetic interference caused by explosion in hydrogen gas detection, safety coefficient is low. Was designed and implemented a hydrogen flow detection based on acoustic resonance frequency drive system design method, through testing the different concentrations of hydrogen through the sensor after the sensor resonance frequency changes caused by changes in the concentrations of the reaction of hydrogen system based on S3C2410 module design, design of the peripheral signal conditioning circuit, chip for the Linux system transplantation, security and accuracy are greatly improved. Finally simulation experiment, the experiment tools include sensors and probes, chip of hardware circuit, USB data acquisition card; Models are respectively 1%, 2.54%, 1 %, 4. 1% of the national standard tested hydrogen, models of 0. 513% carbon monox- ide, models for 100% of the carbon and oxygen. The experimental results show that the system can be in 10 s of concentration of hydrogen flow monitoring alarm, and error is tess than 0. 015 under the different cross gas system of hydrogen flow detection accuracy is as high as 98%, have very strong practicability.