NDLI: Impedance of the eddy-current displacement probe: the transformer model

Content Provider	IEEE Xplore Digital Library
Author	Vyroubal, D.
Copyright Year	1963
Abstract	A new approach to calculation of the impedance of the eddy-current displacement probe is presented. It is based on the transformer model of the probe-to-target coupling. The usual method of calculating the impedance by solving for the electromagnetic field distribution in the probe and the conductive target involves solution of integral equations. Instead, a simpler approach is possible by modeling the probe-to-target coupling as a loaded transformer, involving only linear ac circuit analysis and elliptic integrals (readily available in MATHCAD, MATLAB, etc.). The model transformer has single primary and multiple secondary windings. The primary winding models the probe coil, while the distributed Eddy current's circulation paths are modeled by multiple secondary windings. The target active area (the eddy current's carrying area) is divided into concentric rings. Each ring is modeled as a single-turn secondary loaded with the ring impedance. Simulation shows that division of the target active area into a moderate number of rings (16) is sufficient for very good accuracy of the model. Accuracy was checked by comparison of the simulated transfer curve of the displacement transducer to the measured transfer curve of the actual transducer. The agreement between the model and the measurement is very good. The model can be used to investigate the influence of various coil shapes and target materials on linearity and sensitivity of the eddy-current displacement transducer.
Sponsorship	IEEE Instrumentation and Measurement Society Bureau international des poids et mesures IEEE International Bureau of Weights and Measures (BIPM) URSI NBS Agency Ind. Sci. & Technol., Min. Int. Trade & Ind. Sci. Council Japan International Union of Pure and Applied Physics (IUPAP) NIST NRCC National Conference of Standards Laboratories (NCSL) Allen Osborne Associates Andeen-Hagerling, Inc. Ballantine Lab. Inc. Clarke-Hess Communications Research Corp. Fluke Corporation Guildline Instruments Hewlett-Packard Co. Julie Res. Lab. Inc. Keithley Instruments, Inc. Measurements International Ltd. Canada QuadTech Inc. Quantum Design Inc. Rotek Instrum. Corp. Tegam Inc. Tektronix Inc
Starting Page	384
Ending Page	391
Page Count	8
File Size	337771
File Format	PDF
ISSN	00189456
Volume Number	53
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-04-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Impedance Probes Mathematical model Transducers Coupling circuits Coils Electromagnetic fields Integral equations Circuit analysis MATLAB
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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