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

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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.