基于流动相似理论的温漂补偿电路设计

环境温度对传感器的性能有影响,尤其是对气流式倾角传感器,由于敏感丝感受的是流场的变化,温度漂移更突出.该文根据气流式倾角传感器的敏感机理,利用粘性流体运动的相似理论,设计了一个补偿电路,该电路通过改变传感器内部热源的温度,使密闭腔内的流动在环境温度变化时保持流动相似,从而达到减少温度漂移的目的.试验结果表明,加上补偿电路后,电桥输出的温度漂移减少超过70%,此电路可减少环境温度对传感器性能的影响.

Designs for Temperature Compensation Circuit Based on Fluid Similarity

The influence of environmental temperature on the sensor property couldn't be neglected, especially for gas pendulum sensor. Because the hot wires sense fluid change, the drift of temperature is more apparent. According to the sensing mechanism of gas pendulum sensor and the fluid similarity, a temperature compensation circuit that made heat source temperature of inner sensor change and kept the fluid similarly was designed, and consequently the drift of temperature was decreased. Experiment results showed that by adding the compensation circuit, the drift of electrical bridge output decreased to 70%. This circuit can effectively eliminate the influence of environmental temperature on the tilt sensor.