探空温度传感器的太阳辐射误差修正方法研究

Research on Solar Radiation Error Correction Method of Sounding Temperature Sensor

由于太阳辐射的影响,探空温度传感器高空测量时的辐射误差可达3 K量级。为提高传感器测量精度,提出一种太阳辐射误差修正方法。首先通过计算流体动力学(CFD)方法计算珠状热敏电阻的太阳辐射误差,然后采用准牛顿法(BFGS)拟合仿真数据并得到太阳辐射误差修正方程,最后通过低气压风洞和太阳模拟器实验平台对修正方程的准确性进行验证。实验结果表明,在太阳高度角和海拔高度范围分别为0°～60°和10～32 km时,珠状热敏电阻辐射误差修正值与实验测量值之间差值的平均值为0.124 K,均方根误差为0.083 K,验证了辐射误差修正方法的可行性。

Due to the influence of solar radiation,the radiation error of the sounding temperature sensor can be as large as 3K when measured at high altitude.To improve the measurement accuracy of the sensor,a solar radiation error correction method was proposed.Firstly,the solar radiation error of a bead thermistor was calculated by a computational fluid dynamics(CFD)method,then the simulation data was fitted by Broyden Fletcher Goldfarb Shanno algorithm(BFGS)and a solar radiation error correction equation was obtained.Finally,the accuracy of the modified equation was verified by a low-pressure wind tunnel and solar simulator experimental platform.The experiment results show that the average value of the difference between the correction value of the bead thermistor radiation error and the measurement result is 0.124 K in the range of 0°to 60°solar elevation angle and from 10 km to 32 km altitude.The square root error is 0.083 K,which verifies the feasibility of the correction method of radiation error.