Absrtact: The effects of frequency (915-2450 MHz), moisture content (16-48%) and temperature (25-60 C) on dielectric constant and dielectric loss factor (E) of Jiangnan rice cake were measured and studied by network analyzer. The penetration depth of microwave drying equipment was calculated and the effects of frequency, moisture content and temperature on the annual cake were analyzed. The relationship model between electrical parameters and main influencing factors verifies the accuracy and feasibility of predicting water content based on dielectric parameters.
The results show that in the frequency range of 915-2450 MHz, the e’‘of rice cake decreases with the increase of frequency, the e’’ increases with the increase of frequency, the e’'and e’’ both increase with the increase of water content, but decrease with the increase of temperature, and the energy penetration depth decreases with the increase of water content and frequency, and increases with the increase of temperature. The relationship between dielectric parameters and main influencing factors can be described by binary cubic equation, and the determinant coefficients of each model are greater than 0.99. This study has important guiding significance for understanding the dielectric properties of rice cake and the development of moisture content detector.
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