The paper discusses practical application of spectral pyrometry for controlling the temperature of a dielectric object subjected to heating in a high-intensity microwave electromagnetic field. The authors describe the advantages of using spectral versus color and brightness pyrometry when measuring high temperatures (500°C and above). To eliminate a negative impact of the electromagnetic field on a fiber-optic cable, which is exposed to thermal radiation from a microwave field-heated object and may fail in case of overheating, it is proposed to place a below-cutoff waveguide inside instead of outside of the microwave heating chamber. It is shown that such solution completely eliminates the negative impact of the electromagnetic field on the fiber-optic cable and allows positioning the receiving end of the cable in close proximity to the heated object. A calculation of geometric parameters of the below-cutoff waveguide is provided given the operating frequency of the electromagnetic field of 2450 MHz.
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Translated from Izmeritel’naya Tekhnika, No. 9, pp. 54–59, September, 2020.
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Lapshinov, B.A., Mamontov, A.V. Application of Spectral Pyrometry Under Conditions of Intense Microwave Electromagnetic Fields. Meas Tech 63, 741–746 (2020). https://doi.org/10.1007/s11018-021-01848-x
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DOI: https://doi.org/10.1007/s11018-021-01848-x