Thermal effect of the eddy current sensor probe for measuring the gaps between curved surfaces

The planar eddy current coil is an important device to detect the gap between tow complex curved surface bodies. In order to ensure its safety, its thermal effect was researched using the finite element temperature field analysis. The relation curves between temperature and time or current were simulated and proved by a series of experiments. It is found that the coil's node temperature rises with time to a balance condition and the balance temperature increases with current's rising. The permissible maximum current was given in different safe temperature conditions. The research result provides the academic basis for the eddy current sensor probe's safe application.