Point-frequency high-speed microwave close-range measurement method with cut-off waveguide radiation port

Abstract

The invention provides a point-frequency high-speed microwave close-range measurement method with a cut-off waveguide radiation port, using a resonant cavity as a sensor, when the distance to be measured changes, the resonant cavity exhibits different resonance characteristics, causing changes in the intensity of the reflected signal , when the distance to be measured meets a certain range condition, the distance to be measured can be determined by measuring the intensity of the reflected signal. Since the measurement result of the present invention is a voltage signal rather than a phase difference, it is simple and easy to implement, and the measurement is easier and more accurate, and the resonance The characteristics are not easily affected by factors such as the environment, and the measurement accuracy is significantly improved. The resonant cavity has a cut-off waveguide radiation port, and the adjustment of the measurement range is realized through the adjustment of the cut-off waveguide. The measurement range is controllable, and it meets the high-speed measurement requirements. High-speed and high-precision measurement.

Description

technical field [0001] The invention relates to the field of microwaves, in particular to the field of microwave short-distance measurement. Background technique [0002] In recent years, the performance of the engine has been continuously improved, and the structure is increasingly developing towards the trend of high speed, high efficiency, high precision and high reliability. The dynamics of the tip clearance of a turbine engine is crucial to the performance of the engine, and the control of the radial clearance of the engine rotor blades is a very important link to improve the aerodynamic performance and efficiency of the engine. When the tip clearance increases by 1% of the blade length, the efficiency decreases by about 1.5%, and when the efficiency decreases by 1%, the fuel consumption rate increases by about 2%. In engine operation, maintaining a good tip clearance fit can reduce the leakage of working medium, reduce the end wall loss and further improve engine perf...

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Problems solved by technology

[0005] In order to overcome the deficiencies of the existing technology, and aiming at the problems of difficult phase difference measurement, low precision and small measurement range in the traditional microwave method for measuring blade tip clearance, the present invention designs a new microwave measurement method, which calculates the phase difference by measuring the reflected voltage. Corresponds to the blade tip spacing, and has the characteristics of adjustable measurement range, while avoiding the problems existing in the traditional microwave method, it inherits the advantages of microwave method measurement, thereby improving the measurement accuracy and measurement speed and can adjust the measurement range according to the application

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