Probing multimode applicator of microwave heating system for E-field distribution using a silicon carbide sensor and a shielded thermocouple

Iyer, SB and Shivashankar, S and Sai, R and Atre, MV and Bhat, N (2022) Probing multimode applicator of microwave heating system for E-field distribution using a silicon carbide sensor and a shielded thermocouple. In: International Journal of Ceramic Engineering and Science .

PDF int_jou_cer_2022.pdf - Published Version Restricted to Registered users only Download (2MB) | Request a copy

Abstract

Measurement of the field distribution in a multimode applicator of a microwave heating system has been a challenging problem. We report here a simple but comprehensive scheme for its semi-quantitative estimation under no-load conditions. It involves the measurement of temperature (T) versus time (t) profiles in a small silicon carbide (SiC) sensor ring positioned at the junction end of a metal-jacketed microwave-compatible thermocouple probe arrangement. These heating profiles (T vs. t) were measured using a data acquisition system, keeping the SiC ring at different (x, y, z) positions in the applicator. Using this measurement scheme, the spatial positions with local field minimum as inferred from very high reflected power or those with local field maximum with associated thermal runaway type condition could be well identified. Given the thermal and the dielectric properties of SiC material and the physical dimensions of the sensor ring, a uniform microwave field-based model with a thermal lumped element type approximation (with no thermal gradient across SiC) was applied for analysis of the T versus t heating profiles. Within this model, the locally effective electric field E could be inferred for low and moderate electric field ranges. While the accuracy of the field estimation is currently limited by the use of the metal-jacketed thermocouple and other factors, this SiC sensor-based methodology has the potential to be developed further to be useful in the area of microwave applicator design.

Item Type:	Journal Article
Publication:	International Journal of Ceramic Engineering and Science
Publisher:	John Wiley and Sons Inc
Additional Information:	The copyright for this article belongs to John Wiley and Sons Inc.
Keywords:	field measurement method; microwave multimode applicator; SiC sensor
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	05 Oct 2022 09:51
Last Modified:	05 Oct 2022 09:51
URI:	https://eprints.iisc.ac.in/id/eprint/77066

Actions (login required)

View Item