摘要
火星大气密度测量需要传感器灵敏度高、功耗低、响应时间短,为此提出了基于气动加热原理的新型传感器方案。通过对火星轨道气体流动状态进行判断、对分子与热敏器件碰撞产生的热功率密度和正压强的计算和对噪声及性能的分析,新型传感器可行性从理论上得到了论证。传感器测量火星轨道高度范围为90 km到400 km,理论热响应时间为122 ms,最小可探测压强为2.05×10-8Pa。
Martian atmosphere density measurement instruments need new sensors which have low power consumption,high sensitivity and fast response speed. Therefore, this paper proposes a new method to fabricate atmosphere density sensor ba- sing on aerodynamic heating principle, and verifies the theoretical feasibility by judging the gas flow state, eaculating the ther- mal power density ＆ pressure generated by collisions of molecules with thermal devices and analyzing the noise and perform- ance. The sensor is suitable for measuring the Mars＇ atmospheric density at the altitude from 90 km to 400 km. Its thermal re- sponse time is 122 ms and the lowest detectable pressure is 2.05×10-8 Pa.
出处
《真空与低温》
2012年第3期171-175,共5页
Vacuum and Cryogenics
关键词
大气密度传感器
理论可行性
气动加热
火星
atmosphere density sensor
theoretical feasibility
aerodynamic heating
Mars
