仪表放大器对热敏电阻风速传感器的误差改进

Minish tolerance of thermistor win-speed sensor by instrumentation amplifier

热敏电阻风速传感器的工作原理是测量风速、热敏电阻值和输出电压间关系,导致热敏电阻风速传感器的测量误差偏大。热敏电阻风速传感器的精度主要依赖热敏电阻选型和桥电路及相关运放电路的改进.实验表明,采用仪表放大器AD627可以比运算放大器获得更高的输出电压精度,减小热敏电阻风速传感器在电路部分的误差。

The working principle of thermistor wind-speed sensor is to measure the relationship between wind-speed, thermal resistance values and the output voltage, so the sensors measure tolerance is too large. The accuracy of thermistor wind-speed sensor mainly relies on thermistor selection and bridge circuit and the improvement of operational amplifier circuit. Experiments show that instrumentation amplifier AD627 can obtain higher accuracy of output voltage than operational amplifier, Minish tolerance of win-speed sensor used thermistor in the circuit.