Measurement Method of Temperature Sensor's Thermal Time Constant not Depending on the Sensor's Static Characteristic
Gao Wei · Journal of Henan Normal University · 2012
Basing on the cognition that the rate of thermal energy exchange between temperature sensor and the medium the sensor to be in is independent of the sensor's static characteristic,a measurement method of thermal time constant of temperature sensor is put forward,it does not use the sensor's static characteristic.The algebra equation of thermal time constant of temperature sensor is derived.On this method the same sensor is heated by constant power twice in two different power,in the two processes,the medium environment of the sensor,the sensor's temperature in the beginning of heating and the sensor's temperature in the ending of heating are the same as each other respectively.The thermal time constant of temperature sensor can be figured out according to the time and power in the two processes.The method is rigorous in theory,is feasible in technology,and has no measurement errors coming from the discreteness and nonlinearity of the sensor's static characteristic.It provides the theoretical basis and technical means for measuring thermal time constant of contact temperature sensor accurately.