中文摘要：

判断冷冻干燥过程的升华干燥结束点和解吸干燥结束点,对冷冻干燥过程的优化控制有重要意义。以富士苹果为试验材料,在JDG-0.2型真空冻干试验机上进行了冷冻干燥动力学特性试验。采用自制的物料水分在线测量系统,实时测量和绘制苹果块在冷冻干燥过程中的含水率及其变化曲线,根据测量数据分析了物料冷冻干燥动力学特性,提出了升华干燥结束点和解吸干燥结束点的判别方法,便于冷冻干燥过程参数的优化控制。

英文摘要：

It is of great significance for optimal controlling the freeze-drying process to determine the end of sublimation drying and desorption.The drying dynamical characteristics test for Fuji apple were carried out using the JDG-0.2 type vacuum freeze-drying machine.Based on the homemade real-time online measurement system,the moisture content of apple blocks was measured,and the changing curve was drawn during the freeze-drying process.According to the measured data,the freeze-drying dynamical characteristics were analyzed,the judgment method for the end of sublimation drying and desorption was proposed.It provides the means for optimal controlling parameters during the freeze-drying process.