【摘要】 将ARM7应用到气敏传感器中,利用其强大的数据计算处理能力及控制能力,结合气敏薄膜材料的高阻值特点,设计出了显示气敏元件阻值及其所处气体浓度的测试电路。该电路以LPC2131实时监测电源电压,自动调整占空比,实现对温度的准确控制,并测量气敏薄膜的电阻。经气体浓度和元件阻值的校准后,电路可显示被测气体浓度,同时提供一个友好的用户界面,并具备报警功能,实现了智能气敏传感器的测量电路。完全满足气敏测试需要,电阻的测量精度达到±0.2%。更多还原

【Abstract】 The increasingly popular ARM microprocessor was applied to the testing circuit for gas sensors.Combining the powerful data calculation and control capability of ARM with the high resistance characteristic of gas sensitive film,the microprocessor LPC2131 controls instantly power’s voltage,the functions of the circuit are controlling the gas sensors working temperatures,and measuring the resistance of gas sensitive film.After calibration of relationship between the gas concentration and component resistance,this circuit not only can display the gas sensor’s resistance and the tested gas concentration,but also can provide us with a user’s interface very friendly,it fulfill the needs of gas sensor test perfectly,the resistance measuement precision is 0.2%.更多还原