高频真空干燥是一种快速且高质量的木材干燥方法。然而，由于电磁场的影响，到目前为止还没有精确的含水率及干燥应力的在线检测手段，极大制约了其理论研究和产业应用。本项目利用光纤传感器在线检测高频真空干燥过程中木材内部温度和压力，引入负压下平衡含水率（VEMC）参数，构建基于温度、压力、VEMC的内驱动平衡理论及含水率检测模型来揭示木材内部含水率及其分布；在含水率检测模型的基础上，依据木材流变学理论及差分原理，对干燥时间进行离散，建立高频真空干燥过程中应力检测模型，通过实验进行模型验证进而揭示干燥过程中应变和应力的变化规律。含水率和干燥应力检测模型的建立不仅为高频真空干燥工艺创新及实施智能化控制提供理论依据、为干燥传热传质等理论研究提供有效手段，同时对生产中完善干燥工艺、缩短干燥时间、保证干燥质量等具有重要的现实指导意义。

Although radio-frequency/vacuum drying is a fast and high quality drying technology, the drying mechanism study and industrialization of radio-frequency/vacuum drying are restricted since there has been no accurate measuring way for moisture content (MC) and drying stress so far. In this project, based on the accurate measuring for temperature and pressure under high frequency electric field using optical fiber sensors and the parameter of equilibrium mositure content at vacuum condition (VEMC), the internal driving equilibrium theory and the modeling of moisture content measuring is created. The real time measuring mechanism is revealed according to the theory and modeling. With the aid of previous modeling of moisture content measuring, rheological theory and differential theory, the modeling of drying stress measuring is created. The drying stress and strain is revealed according to this modeling after model validations under radio-frequency/vacuum drying. The modeling of moisture content and drying stress measuring provide not only theoretical basis for drying technology innovation, intelligent control and effective way for the study on heat and mass transfer during drying, but also a scientific guidance for practical lumber drying.