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This paper describes the design and implementation of a thermal simulator which utilises the basic heat-flow and heat-retention equations in the form of Electro-Thermal modeling to simulate the thermal response of a body. A scheme has been proposed to enter the external thermal excitation and the thermo-behavioural description of the body in the simulator in the form of net-list. It also takes in account the convection and radiation losses using Newton's law of cooling and Stefan-Boltzmann's law of radiation respectively. Finally it outputs a playable movies which simulates that captured by an IR camera. By the way of validation, the simulator has been deployed on a reference sample of mild-steel plate with blind holes drilled from the back. The actual plate has been thermographed under 50 MHz periodic heating. The temperature evolution of the surface is compared to that obtained from the simulator. Results, which closely match, are presented.