流动相似律在气流式倾角传感器中的应用

气流式惯性传感器因其独特的优点引起大家的关注,但是环境温度不可避免地对气流式传感器性能有影响,会产生严重的温度漂移。它不仅局限了传感器的应用范围,而且还影响了传感器性能的进一步提高。本文通过数值模拟的方法,研究了环境温度变化时气流式倾角传感器腔体内的流场变化,分析了流场变化对传感器性能的影响机理,并利用相似理论讨论了一种新的消除环境温度影响的解决办法。结果表明,可以通过设计的补偿电路改变热源温度使流场保持相似来消除环境温度的影响。

Application of Flow Similarity to Convection-based Tilt Sensor

A kind of inertial sensor based on natural convection is attracting more and more attentions recently. But the environment temperature has inevitable effects on property of the convection-based sensors. By numerical simulation the fluid flow in chamber of such a tilt sensor, which is changing with the environment temperature, is researched. The mechanism of influence of fluid flow on property of sensor is analyzed. A method of eliminating the influence of environment temperature on property of sensor is proposed based on the theory of flow similarity. The results show that a compensative circuit specially designed can keep flow similarity so as to eliminate the influence of environment temperature.