瞬态表面温度传感器动态建模方法研究

测量瞬态高温时,由于传感器自身的热惯性,测量结果与真实结果之间存在很大的动态误差.动态补偿或动态误差修正对于改善测温系统动态特性,减小动态误差有重要意义,而建立温度传感器动态数学模型则是进行动态补偿或动态误差修正的前提.本文首先设计了瞬态表面温度传感器动态校准系统;然后,利用系统所测得输入输出数据,采用系统辨识方法建立了测温系统的动态数学模型;最后,利用交叉检验法验证该模型的正确性.经检验该方法可以达到理想的辨识效果,从而为系统反滤波动态误差修正奠定了基础.

The Research on Modeling Method of Transient Surface Temperature Sensor

In transient high temperature measurement, there are great dynamic errors between measured results and the real signal for the exiting of thermal inertia of the transducer. So dynamic compensation and error correction are meaningful to improve the dynamic property and decrease the dynamic error of the temperature measurement system. The dynamic modeling of surface sensor is the premise of dynamic compensation and error correction. Firstly, the dynamic calibrate system is designed in this paper. Then, using the dynamic calibration I/O data of transient surface temperature sensor, the dynamic mathematic model of this temperature measurement system is constructed with the system identification method. Lastly, the validity of the model is also testified by the cross-validation method. The model can be used to establish a base for dynamic error inverse-filtering calibration.