Heat loss self-compensating terminal type water load microwave high power meter

Abstract

The invention relates to a heat loss self-compensating terminal type water load microwave high power meter which comprises a water supply system, a testing system and an additional heat loss compensating system, wherein the heat loss compensating system comprises a testing head 10, a quartz glass body 13 and a temperature difference sensor 41; and the structure of the heat loss compensating system is the same as that of a testing system which comprises a testing head 1, a quartz glass body 2, and the like and ensures that heat loss temperature difference signals are reversely connected with a temperature difference sensor 4 of the testing system in series through the temperature difference sensor 41 so as to realize the dynamic compensation of the heat loss signals and improve the measuring precision. The invention has the advantages of simple structure and convenient application.

Description

technical field [0001] The invention belongs to an electronic test instrument, and is particularly related to the test of microwave high power. Background technique [0002] At present, the most effective and commonly used method for the measurement of microwave high power from several watts to tens of kilowatts is water load. As a terminal type measurement, water with a certain flow rate is injected into the waveguide type measurement head, as long as the design has an attenuation section of 80 ~ 90dB , when the microwave power enters the measuring head and its standing wave ratio ρ<1.2, it can be considered that the microwave power is completely absorbed through the measuring head, and the absorbed microwave power is converted into water temperature by thermal work, and then passed through the thermocouple The sensor converts the water temperature into a power indicator, and through the AC standard, the microwave power measured by the terminal water load is obtained. ...

AI Technical Summary

Problems solved by technology

[0021] figure 1 The prior art scheme shown has a heat loss error problem for high-power microwave testing. Using a 10 kilowatt magnetron plus a 5KVA five-centimeter wave, the resulting heat loss error is enough to cause 15% to 30% of the terminal microwave power meter. error

[0022] If a pass-through type plus a directional coupler is used (taking 10 kW microwave power as an example), the error introduced by the terminal type heat loss is calculated according to figure 1 Measuring the microwave power indicator can even have a negative value, which proves that there is a heat loss error exceeding 100% of the microwave power

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