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 of BlackBerry were measured and studied by network analyzer. The microwave drying equipment was calculated, and the effects of frequency, moisture content and temperature on the dielectric parameters and dielectric loss factor of BlackBerry at some frequencies were analyzed. The relationship model of the main influencing factors verifies the accuracy and feasibility of predicting water content based on dielectric parameters.
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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