Absrtact: The effects of frequency (1-3 000 MHz), moisture content (20%-80%) and temperature (20-100 C) on relative dielectric constant and dielectric loss factor (E) of BlackBerry were measured and studied by network analyzer. The penetration depth of microwave drying equipment was calculated, and the frequency, moisture content and temperature were analyzed. The relationship model between dielectric parameters of blackberry and main influencing factors at partial frequencies was established, and the accuracy and feasibility of predicting moisture content based on dielectric parameters were tested.
Key words: Blackberry microwave drying; dielectric properties; moisture content; temperature; frequency; penetration depth
Blackberry is a widely distributed and well-known shrub, which belongs to the genus Rubus of Rosaceae. Blackberry, originated in North America, is the third generation of small fruit trees. Its fruit is rich in nutrition, tender and juicy, unique flavor, and rich in essential amino acids and trace elements for human body. Fresh fruit and its series of processed products are very popular with consumers.
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