Microwave radiometry for continuous non-contact temperature measurements during microwave heating

Area of Science:

• Electromagnetics
• Thermodynamics
• Applied Physics

Background:

• Accurate temperature measurement is vital for optimizing industrial and commercial microwave heating processes, impacting quality, throughput, and energy conservation.
• Traditional temperature measurement methods within microwave cavities are often expensive, impractical, or unsuitable for high-volume industrial applications.

Purpose of the Study:

• To explore the theory and application of microwave radiometry for non-invasive temperature measurement during microwave heating.
• To demonstrate the suitability of microwave cavities for radiometry by extending radiative transfer theory.

Main Methods:

• Developed a theoretical framework by extending radiative transfer theory to analyze thermal microwave radiation within a cavity.
• Applied microwave radiometry principles to measure temperature during the heating of liquid and solid materials.

Main Results:

• Experimental data confirmed the theoretical predictions regarding the use of microwave cavities for radiometry.
• The microwave radiometry method demonstrated agreement with conventional temperature measurement techniques within a margin of +/-4 degrees C.

Conclusions:

• Microwave radiometry is a viable and effective technique for non-contact temperature measurement in industrial microwave heating.
• The inherent properties of microwave cavities facilitate accurate temperature data acquisition using radiometry, offering a practical alternative to conventional methods.