In this study, we report on the development of a system for calculating the selective heating behavior of local regions under microwave irradiation from fitting of the thermal radiation spectrum, and for verifying the selective heating effect on diffusion phenomena. Microwave energy is irradiated on materials with different microwave absorption characteristics, and significant temperature differences and gradients are produced by selective heating. We developed a high-resolution spectroscopic system to measure Planckian radiation from the sample surface and quantify the local temperature gradient. The temperature distribution was determined by analyzing the spectral data. As a result, a clear temperature gradient was observed between the materials, and in the material that absorbed microwaves well, it exceeded 1000℃. We believe that these findings are a technology that will contribute to elucidating the mechanism of material diffusion under microwave selective heating.

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