Design Of A Reference Sounding Temperature Sensor

Accurate observations of high-altitude atmospheric temperatures are critical for weather forecasting and global climate change research.The reference sounding temperature sensor is used as a high-altitude atmospheric temperature measurement standard,and the measurement accuracy needs to be improved to the order of 0.1K.The sounding temperature sensor is susceptible to solar radiation,long-wave radiation and other factors when detecting highaltitude atmospheric temperature.Solar radiation is the main source of sensor measurement error,and its radiation error value can reach the order of 3K.In order to reduce the solar radiation error of the sounding temperature sensor,this paper develops a platinum wire temperature sensor with low radiation error characteristics,and designs a set of high precision temperature acquisition and data communication system.The computational fluid dynamics(CFD)method is used to simulate a traditional platinum wire sensor probe structure and a modified structure.It is found that the platinum wire sensor based on the new structure features lower solar radiation error,which verified the rationality of the design.CFD method is used to calculate the platinum wire sensor with new structure.The new structure of the platinum wire sensor is fitted with the simulation numerical results by BFGS and the ELM algorithm.By comparing the fitting precision,it is found that the solar radiation error correction equation based on the extreme learning machine algorithm produces better results.A high-altitude environment simulation experimental platform based on a low-pressure wind tunnel and a solar simulator has been built to verify the accuracy of the modified equation.It is found that the root mean square error between the correction value of the solar radiation error and the experimental value is 0.147 K,which is a satisfactory result of the radiation error correction.In order to verify the low-radiation error characteristics of the platinum wire sensor,a bead thermistor is used for comparison.The experimental results show that when the solar elevation angle and altitude range are 0°~60° and 10km~32km,respectively,the radiation error value based on the new structure of the platinum wire sensor is generally smaller than the radiation error value of the bead thermistor.The average value of the difference is-0.148 K,and the root mean square error is 0.077 K.It shows that the platinum wire sensor has better performance in reducing the radiation error.Compared with the traditional sounding temperature sensor,the new structure platinum sounding temperature sensor with low radiation error characteristics designed in this paper has the advantages of high precision and small radiation error,which meets the design requirements.With high precision temperature acquisition system,it may effectively improve the atmospheric temperature detection accuracy.