温度测试中石英加速度计热传递方式研究

Research on Heat Transfer Mode of Quartz Accelerometer in Temperature Measurement

针对温度试验中仪表输出值测试准确性、重复性不高的现状,以石英加速度计为例,进行了阶梯保温试验。试验在不同位置设置测温电阻,在不同的温度条件下,对不同工位的仪表表芯、表芯上下位置及工装等不同位置的温度进行实际测量。试验获得了表芯、工装以及温箱的实际温度数据。通过热传递相关因素的分解,温度场边界条件分析并结合测试数据,找到仪表内部温度变化、仪表与环境温度变化、工装与环境温度变化的特点。建立并修正了温箱内仪表、工装的热传递模型,并找到了仪表测试数据误差的原因。最后,从仪表设计优化、测试设备优化、测试工艺优化等方面对后续改进提升石英加速度计温度模型测试精度提出了建议。

Aimed at the current situation of low accuracy and repeatability of instrument output value in temperature test,a temperature test was conducted on the quartz accelerometer under the condition of step heat preservation.The temperature of the meter core of the station,upper and lower position of the core,the tooling and other position were practically measured,and the actual temperature data of the core,the tooling,and the incubator were obtained.By analyzing the heat transfer factors and the boundary conditions of the temperature field,and combining the test data,the characteristics of the correlation of the temperature change in the internal instrument and between the instrument and the environment,and the correlation between the temperature change of the tooling and the environment were gotten.We also established and modified a heat transfer model of the instrument in the box and tooling,and found the reasons of test data errors.Finally,it was put forward that some suggestions on the improvement of the temperature model test accuracy of quartz accelerations by optimizing the instrument design,test equipment and test process.