| 摘要 |
A device and method for measuring the moisture content of a sample using microwaves is provided. The device includes a power supply for outputting an electrical current, a microwave oscillator electrically connected to the power supply for outputting a microwave signal, and a waveguide placed between the microwave oscillator and the sample. The waveguide has a predetermined length and is constructed from copper. A microwave detector outputs a voltage signal which is related to the intensity of the microwave energy reflected by moisture in the sample. A voltmeter displays a reading of the voltage signal output by the microwave detector. The length of the waveguide is selected to maximize the voltage reading of the voltmeter for a given sample. An enclosure houses the power supply, the microwave oscillator, the waveguide and the microwave detector, and is provided with an opening at which the waveguide is mounted. A sheet of microwave transmissive material covers the opening.
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