The present invention discloses a material
moisture content detection device and method based on
microwave cavity resonance, belonging to the field of
microwave application technology. The device comprises a sample to be tested, a
microwave generator, a weighing unit, a sample tank, a temperature sensor, a microwave
resonant cavity, an excitation probe, a detection probe, a
detector, a
control unit and a display output unit. In the present invention, the
control unit controls the excitation
voltage of the microwave generator and generates a microwave
signal, which enters the microwave
resonant cavity through the excitation probe and is received by the detection probe. The detection probe located inside the microwave
resonant cavity detects the change in resonant frequency, and the temperature sensor located below the sample tank measures the temperature of the sample to be tested, establishes a
functional relationship, and inverts the
moisture content of the material to be tested. The present invention improves the universality and detection accuracy of the microwave
moisture content detection device, and the result is not affected by the material temperature and stacking conditions, thereby realizing rapid, non-destructive and high-precision detection of the moisture content of granular, powdered or liquid materials.