| 摘要 |
FIELD: electricity.SUBSTANCE: contactless radiowave device to measure thickness of dielectric materials comprises the first microwave oscillator, power divider, the first and second frequency multiplier, antennae for emission of electromagnetic waves normally towards surface of a dielectric plate and receipt of reflected waves, mixer, computing unit coupled to output of the mixer. The device comprises additionally the second microwave oscillator, a switch, the first circulator, which first output is connected to the first output of the power divider, the second output is connected to the first antenna, the third output via the second frequency multiplier is coupled to the first input of the mixer, the second circulator, which first output is connected to the second output of the power divider via the first frequency multiplier, the second output is coupled to the second antenna, the third output is connected to the second input of the mixer, at that the first and second microwave oscillators are coupled to the first and second inputs of the switch, control input of the switch is coupled to the computing unit while its output is coupled to input of the power divider.EFFECT: higher accuracy of measurement.1 dwg |
