Observation of liquid levels inside opaque metal and resin container by dynamic heat conduction

提出了一种观察不透明的金属和树脂容器内的液位的方法，其中，在通过闪光灯对容器进行瞬时加热之后，使用红外相机来监测容器的表面温度的变化。该技术利用在非常短的时间尺度内发生的动态热传输过程，并且是非破坏性和非接触性的。该方法已成功地用于金属、树脂和纸等材料容器的液位测量，其理论基础是辐射、传导和对流三种传热方式。该方法可以预期在研究和工业中具有广泛的应用，由于简单和广泛适用的操作原理，它利用相邻材料之间的不同传热速率来识别界面的存在。

A method of observing the liquid level inside an opaque metal and resin container is proposed, where the change in surface temperature of the container is monitored using an infrared camera following momentary heating of the container by a flash. This technique makes use of dynamic heat transport processes occurring over a very short time scale, and is both non-destructive and non-contact. The proposed method have succeeded in inferring the liquid level in containers composed of metal, resin and paper, and the theory of the proposed method is composed of the three modes of heat transport: radiation, conduction and convection. The proposed method can expected to have a wide range of applications in research and industry, due to the simple and broadly applicable principle of operation, which exploits the different rates of heat transfer between adjacent materials to discern the presence of interfaces.