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Method for measuring error with high power microwave under mismatched load eliminated condition

A high-power microwave and measurement error technology, applied in radiation intensity measurement, nuclear reactors, nuclear power generation, etc., can solve problems such as device inoperability, loss, and ceramic window cracking

Inactive Publication Date: 2007-12-05
INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

Accurate power measurement and precise protection are the lifeline of the whole system. Once the protection is not done in time, the ceramic window will be broken and the whole device will not be able to operate.
Vacuum, low-temperature superconductivity, etc. will waste the time waiting for the microwave system to be repaired, and bring great losses to the country

Method used

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  • Method for measuring error with high power microwave under mismatched load eliminated condition
  • Method for measuring error with high power microwave under mismatched load eliminated condition
  • Method for measuring error with high power microwave under mismatched load eliminated condition

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Embodiment Construction

[0078] (1) First, according to the microwave transmission line theory, the relationship between the measured power and the actual power is obtained by analyzing the simplified signal flow diagram.

[0079] a Signal analysis within the transmission line (see Figure 1)

[0080] The signal flow diagram in the waveguide transmission line is shown in Figure 1. The left side of dashed line 1 is equivalent to the signal viewed from the coupled port of the directional coupler to the source; the right side of dashed line 2 is equivalent to the signal viewed from the terminal of the transmission line to the load. When the electrical length d=0, there are:

[0081] V g +V r Г g =V i (7.1)

[0082] V r =V i Г L (7.2)

[0083] From formula (7.1), (7.2) can be solved:

[0084] V i =V g / (1-Г g Г L ) (7.3)

[0085] V r =V i Г L (7.4)

[0086] When the electrical length d≠0, for...

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Abstract

The invention discloses an error measuring method of high-power microwave in the mismatch load eliminating condition, which is characterized by the following: analyzing through simplified signal flowchart according to microwave transmitting line theory; obtaining the relationship formula between measured power and real power; analyzing and calculating through writing and compiling program according to the relationship formula; obtaining the quantized error; controlling and protecting the control program according to real power; ensuring safe operation of huge TOKAMAK system; providing reliable safe guard for power measurement and protection under high-power mismatch load.

Description

technical field [0001] The invention belongs to high-power microwave coupling measurement and data processing technology, in particular to a method for eliminating high-power microwave measurement errors under mismatched load conditions. Background technique [0002] On the National Science and Engineering All-Superconducting Tokamak EAST, high-power microwaves (MW level) will be used to drive plasma. The atmospheric side of the microwave transmission line is separated from the vacuum side of the device by a ceramic window. In order to ensure the vacuum environment of the device, this requires the microwave system to be able to accurately and timely turn off the microwave during high reflection and sparking, so as to protect the safety of the ceramic window. In practice, it is found that there are large errors in the measurement of high-power microwaves through directional couplers. Through preliminary analysis, it is considered that it is mainly caused by the insufficient...

Claims

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Application Information

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IPC IPC(8): G01T1/16G21B1/00
CPCY02E30/122Y02E30/10
Inventor 王茂
Owner INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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