Study of Wheatstone Bridge and Measurement Sensitivity in the Circuit of Heat-sensitive Sensor
Shao Genzhong · Spacecraft Engineering · 2008
During the manned spacecraft development stage,the study on high-accuracy temperature measurement circuit is very important for its normal working.It is certain that the temperature accuracy reflected by heat-sensitive sensor plays an important role in the heat-controlling process of the manned spacecraft.The astronauts' body temperature and the temperature of various parts in spacecraft are generally monitored by heat-sensitive sensors composed of thermal resistance because of their high sensitivity and reliability.In the paper,based on the circuit theory the measurement sensitivity of the wheatstone bridge and thermal resistance are analysed firstly in the heat-sensitive sensor circuit,and then the measurement sensitivity changing with the bridge arm resistance and the thermal resistance parameters is discussed in detail with the help of Matlab 7.0 Software.