Multichannel broadband microwave radiometer with self-calibration function

Abstract

The invention belongs to a nuclear fusion plasma diagnosis device, and particularly relates to a multichannel broadband microwave radiometer with a self-calibration function. The multichannel broadband microwave radiometer is composed of a microwave source, a controller, an isolator, a frequency mixer, a filter, a microwave antenna system, a broadband microwave amplification system, a broadband power divider array, a demodulator and a video amplification system. Advantages of the multichannel broadband microwave radiometer are that the working mode of the microwave radiometer system is adjusted so that relative calibration between all channels is realized, and the multichannel broadband microwave radiometer has advantages that the calibration method is easy, reliability is high, cost is low and system measurement frequency range is wide. The microwave radiometer can be used for fusion plasma microwave diagnosis and can also be used for spatial microwave radiation monitoring and microwave communication signal receiving.

Description

technical field [0001] The invention belongs to a nuclear fusion plasma diagnosis device, in particular to a multi-channel broadband microwave radiometer with self-calibration function, which has the advantages of simple calibration method, high reliability, low cost, wide measurement frequency range and the like. Background technique [0002] The microwave radiometer is an important means to measure the temperature of plasma electrons. This is because the high-temperature plasma in the tokamak is confined by the magnetic field. Due to the Lorentz force, the electrons perform cyclotron motion to generate electron cyclotron radiation, and the electron cyclotron radiation frequency At microwave frequencies, the intensity is proportional to the electron temperature. Since the frequency of the electron cyclotron radiation is the cyclotron frequency of the emission point and its harmonic frequency, which is completely determined by the magnetic field of the emission point, the el...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a multi-channel broadband microwave radiometer with self-calibration function, which can solve the problems that calibration requires additional dual-temperature calibration sources, and the calibration process is complicated and time-consuming.

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