A high frequency response passive LC speed sensor and its testing method

Abstract

The invention discloses a high frequency response passive LC rotational speed sensor and a testing method thereof. The sensor comprises a rotational speed sensitive unit, an antenna and a characteristic signal processing circuit. The rotational speed sensitive unit is a passive LC structure for sensing the rotational speed to be measured. Parameter; the antenna is a single-turn spiral inductor, prepared by copper wire; the characteristic signal processing circuit includes a signal source module, a characteristic detection module, a data acquisition module and a PC, wherein the signal source module, a characteristic detection module and a data acquisition The module is connected through a directional coupler; during the test, the relative position of the LC sensitive unit located on the surface of the high-spin component and the reading antenna changes periodically, and the two produce three types of coupling forms: positive coupling, partial coupling, and no coupling. The wireless measurement of the rotational speed can be realized by extracting the adjacent trough time slots. The sensor of the invention has the characteristics of thin mass, high temperature resistance, high frequency response, etc., and can realize wireless measurement of rotational speed parameters.

Description

technical field [0001] The invention relates to the field of rotational speed sensors, in particular to a high-frequency-response passive LC rotational speed sensor and a testing method thereof. Background technique [0002] Speed ​​measurement in high temperature environment is one of the key parameters to detect whether aero-engines, ultra-high-speed turbo pumps and other equipment are running normally and safely. The real-time and in-situ acquisition of working state parameters such as the speed of high-temperature rotating key components has always been a technical problem that plagues the performance improvement of speed devices in harsh environments. On the one hand, the existing speed sensor has a complex mechanical structure and is difficult to manufacture. On the other hand, the use of connecting signal transmission lines and power supplies limits the applicable temperature of the sensor. These characteristics limit the application of the sensor in harsh environment...

AI Technical Summary

Problems solved by technology

On the one hand, the existing speed sensor has a complex mechanical structure and is difficult to manufacture. On the other hand, the use of connecting signal transmission lines and power supplies limits the applicable temperature of the sensor. These characteristics limit the application of the sensor in harsh environments such as high temperature

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