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Research on Key Technologies for Planar Eddy Sensor

Author: ZhaoJianQiang
Tutor: WengFeiBing
School: National University of Defense Science and Technology
Course: Power Electronics and Power Drives
Keywords: Plane eddy current sensor Mathematical model Finite Element Conductivity Lift-off
CLC: TP212
Type: Master's thesis
Year: 2011
Downloads: 16
Quote: 0
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Abstract


Gear member surface crack , fatigue damage will change the conductivity of the surface of the member , plane eddy current sensor can accurately measure the surface conductivity, and can evaluate the degree of surface damage according to the measurement results . The research plane eddy current sensor key technologies have important non-destructive testing of critical components of the equipment . Domestic plane eddy current sensor has not been studied , the analysis carried out an exploratory study the foreign plane eddy current sensor research dynamic based on its key technologies . Thesis work are as follows : sensor modeling techniques . Starting from the Maxwell equations with collocation method and Fourier series the decomposed theory to establish the mathematical model of the sensor , the sensor has a periodic structure , the sensor transfer impedance can be accurately calculated by the mathematical model . While establishing a finite element model of the sensor , to solve the finite element model can get the same sensor transfer impedance . Sensitive to the direction of the plane eddy current sensor based on the finite element model analysis , and improved sensor design . The the measurement grid generation and use of technology . Computing sensor in certain physical properties and liftoff of the sensor response range , and stored as a database , expressed as in the form of the two-dimensional grid . The two-dimensional grid database describes the nonlinear relationship between the sensor response and the measured object attributes and lift-off . At the same time , the study of the grid search interpolation algorithm can quickly solve the specific sensor response corresponding to the physical properties and the lift-off . The sensor response calibration techniques . In order to make the actual measured sensor response may be in response to the database query , the need for the actual response to be calibrated. The three types of calibration methods , including air point calibration method , the air point - short calibration method and the minimum mean square error calibration method . The last two parts of experiments , including single point measurement of the electrical conductivity of the surface of the aluminum sheet , lift-off and the aluminum surface damage scan imaging and experimental validation of the findings of the plane eddy current sensor .

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor
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