基于超声波反射法测量温度方法的研究

he paper introduced the temperature measurement by ultrasonic reflection. Based on the relation between the ultrasonic propagation and temperature, the temperature field could be measured by ultrasonic reflection in a distance. The principle of measuring temperature by ultrasonic reflection was that the speed of sound wave would change after passing temperature field. By the time delay between the emission signal and the receiving signal, with the pass distance of ultrasonic through the temperature field, the temperature could be gotten. The signal of measuring temperature was analyzed in the paper. Finally, the erroneous factor and how to reduce it was discussed. The experiment impacted shows the error increasing by noise and other factor with the high temperature. But the cross-correlation function of the ultrasonic signal could decrease error and satisfy the technical requirement of general project.