Non-Destructive Detection of Lingwu Long Jujube Quality by Dielectric Spectroscopy

In order to detect Lingwu long jujube quality, the electrical parameters of Lingwu long-Jujube picked and stored at room temperature were measured dynamically with parallel plate measuring instrument HIOKI 3532-50 LCR. The variation of quality indicators such as pulp firmness, brittleness, total soluble solid (TSS) and moisture during storage were tested and analyzed. Regression equations of quality and under five appropriate test frequencies were established. Among the five test frequencies, 3.16 kHz was determined as the characteristic frequency. The results showed there is a strong correlation between long-Jujube quality and under the characteristic frequency. The method could be used for the jujube fruit quality detection, and can be extended to other fruits quality detection also.