M-w grade microwave power instrumentation system based on calorimetric method

Abstract

The utility model belongs to a microwave power measurement system, specifically discloses a megawatt grade impulse microwave power measurement system based on calorimetric method, wherein an outlet temperature pickup is arranged on the stream outlet of a water pipe and an electric heater is arranged in the water pipe; the electric heater is connected with a rated power electricity supply; a microwave detecting device is arranged on the inlet of a microwave power absorbing device; the water runs through the inwall water pipe of the power absorbing device and an inlet temperature pickup is arranged on the stream inlet of the water pipe; an NTC thermal resistance R3 of the inlet temperature pickup is connected with a equilibrium resistance R1, while an NTC thermal resistance R4 of the outlet temperature pickup is connected with a equilibrium resistance R2; the NTC thermal resistance R3, the NTC thermal resistance R4, the equilibrium resistance R1 and the equilibrium resistance R2 form a Winston bridge and the Winston bridge is connected with a differential amplifying circuit. The utility model can measure the multiplex pulse high-power microwave power in millimetric wave band and the measuring range can be one kilowatt up to two or three megawatt.

Description

technical field [0001] The invention belongs to a microwave power measurement system, in particular to a megawatt-level microwave power measurement system based on calorimetry. Background technique [0002] In the experimental research of controlled nuclear fusion, the electron cyclotron resonance heating (ECRH) system used for plasma-assisted heating is a millimeter-wave high-power microwave system composed of a gyrotron, a transmission line and a transmitting antenna. The single-mode power is between 0.5- 1MW, frequency 35-170GHz, pulse width 0.5-10s, microwave output power is an important parameter that characterizes the scale of the system. At the same time, microwave power is also the most concerned parameter in gyrotron debugging and plasma heating experiments. Therefore, in the ECRH system, a reliable microwave power measurement system must be established. [0003] At present, fluid calorimetry is still one of the main methods used in microwave large and medium powe...

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Problems solved by technology

[0005] This calorimetric high-power meter can measure the power range of 5-2000W, but it can only measure the CW microwave power or the average power of continuous pulse microwave, and cannot measure the microwave power of a single pulse

[0006] If the directional coupler method, which is different from the calorimetric method, is used, in the high-power millimeter-wave band, the design and manufacture of this device requires high technology. At present, it is still in the exploratory stage and has not been widely used.

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