摘要
针对许多测温案例中物体表面温度不易直接测量的问题,提出了一种利用超声的结构回波测温方法。该方法利用测温表面的特殊几何结构得到不同超声反射界面的回波信号,并根据超声在介质中声速与温度的相关性,实现对表面温度的测量。采用互相关函数法和插值方法计算回波的时延值,实现了纳秒级别的时延值测量,保证了测温精度。对试件进行实验参数标定和测温实验,实验表明,超声结构回波测温法得到的表面温度与实际温度变化在整体趋势上基本吻合,整个过程的平均误差不超过4℃,平均相对误差约为6.37%。
Regarding the issue that happens in many cases in which the surface temperature is not easy to be measured directly,an ultrasonic structural echo temperature measurement method is proposed.The way to achieve the goal of measuring the surface temperature is to take advantage of the special geometrical structure of surface which is to be measured to get the echo signal of different ultrasonic reflection interface,and to make use of the correlation between propagation velocity of ultrasonic in medium and the medium temperature to implement the measurement of surface temperature.The cross-correlation algorithm and interpolation methods have been applied to calculate the time delay value of echo and the measurement of time delay at nanosecond level has also been achieved,which ensures the accuracy of temperature measurement.two experimental methods,parameters calibration and temperature measurement test are carried out.Experiments have shown that theultrasonic structural echo temperature measurement method basically coincides with the actual temperature change on the whole trend.The average error of the whole process is no more than 4℃,and the average relative error is about 6.37%.
作者
薛震宇
靳孝峰
侯文
杨录
王高
薛海军
Xue Zhenyu;Jin Xiaofeng;Hou Wen;Yang Lu;Wang Gao;Xue Haijun(College of Information and Communication Engineering,North University of China,Taiyuan 030051,China;School of Mechanical and Electrical Engineering,Jiaozuo University,Jiaozuo 454003,China;Ganzhou Jiatong New Materials Co.,Ltd.,Ganzhou 341000,China)
出处
《国外电子测量技术》
2020年第10期78-83,共6页
Foreign Electronic Measurement Technology
基金
国家自然基金(61573323)
山西省自然科学基金(201901D111161)项目资助。
关键词
表面温度
结构回波
渡越时间
互相关算法
surface temperature
structural echoes
time-of-flight
cross-correlation algorithm
