High-frequency-response passive LC rotating speed sensor and testing method thereof

Abstract

The invention discloses a high-frequency-response passive LC rotating speed sensor and a test method thereof, the sensor comprises a rotating speed sensitive unit, an antenna and a characteristic signal processing circuit, the rotating speed sensitive unit is a passive LC structure and is used for sensing a rotating speed parameter to be tested; the antenna is a single-turn spiral inductor and isprepared from a copper wire; the characteristic signal processing circuit comprises a signal source module, a characteristic detection module, a data acquisition module and a PC, and the signal sourcemodule, the characteristic detection module and the data acquisition module are connected through a directional coupler; during testing, the relative positions of the LC sensitive unit located on thesurface of the high-rotation component and the reading antenna are periodically changed, the LC sensitive unit and the reading antenna generate three periodic change coupling modes including oppositecoupling, partial coupling and no coupling, and wireless measurement of the rotating speed can be achieved by extracting adjacent trough time slots. The sensor provided by the invention has the characteristics of thin mass, high temperature resistance, high frequency response and the like, and can achieve wireless measurement of rotating 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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