基于回声感知技术的介质温度监测

The medium temperature monitoring based on echo sensing technology

声学温度感知技术具有测温范围广、精度高、速度快等特点,在空冷系统和仓储室测温领域应用前景广阔。针对空冷系统和仓储室现有测温技术的问题,该文研究了回声法测温的可行性及稳定性,利用改进后的互相关法测得时延估计,进一步计算得到介质温度。分别用扫频脉冲信号和高斯脉冲信号作为激励声源信号进行仿真,得到高斯脉冲信号测温效果更好。在常温下进行大空间回声测温实验,并在管道内进行不同温度下的回声测温实验。结果表明,上述工况均能得到准确稳定的待测温度,最大绝对误差为±0.85◦C,有望应用在空冷系统测温和粮温测量中。

Acoustic temperature sensing technology has a wide range of temperature measurement,high precision,speed and other characteristics.It has a very broad application prospect in the air cooling system and storage room temperature measurementfield.Aiming at the problems of the existing temperature measurement technology in air-cooling system and storage room,this paper investigates the feasibility and stability of the echo method for temperature measurement.The time delay estimation is measured by using the improved mutual shut-offmethod in order to calculate the medium temperatue.The swept pulse signal and the Gaussian pulse signal are used as incentive signals in the simulation,and the Gaussian pulse signal was obtained to be more effective in temperature measurement.The large space echo temperature measurement experiment at normal temperature and the echo temperature measurement experiment at different temperatures in the pipeline all prove that they can measure accurate and stable temperature,and the maximum absolute error of±0.85◦C.So,the above results are expected to be applied in air cooling system temperature measurement and grain temperature measurement.