Presenter Information

A. J. Bahr, SRI International

Location

Williamsburg, VA

Start Date

1-1-1986 12:00 AM

Description

The objectives of this research program are to develop the theoretical models, design methodology, and technology needed for the optimum application of near-field electromagnetic sensor arrays in NDE and robot control. A basic requirement for this work is to be able to analyze and control the spatial-frequency content in the field configuration generated by the array. To aid in understanding how best to satisfy this requirement, initial efforts at SRI have focused on obtaining experimental measurements of the relative spatial distributions associated with the responses of eddy-current reflection probes to surface steps and surface-breaking rectangular slots in aluminum plates. This paper presents the results obtained using a commercial reflection probe (Nortec SPO-2065) and an SRI-constructed five-coil, air-core reflection probe to interrogate such surface discontinuities. The data obtained with the five-coil probe are then compared with the results of a theory for the spatial response of such a probe that has been developed at Stanford University [1].

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

5A

Chapter

Chapter 3: Sensors and Signal Processing

Section

Sensors

Pages

691-698

DOI

10.1007/978-1-4615-7763-8_71

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Electromagnetic Sensor Arrays— Experimental Studies

Williamsburg, VA

The objectives of this research program are to develop the theoretical models, design methodology, and technology needed for the optimum application of near-field electromagnetic sensor arrays in NDE and robot control. A basic requirement for this work is to be able to analyze and control the spatial-frequency content in the field configuration generated by the array. To aid in understanding how best to satisfy this requirement, initial efforts at SRI have focused on obtaining experimental measurements of the relative spatial distributions associated with the responses of eddy-current reflection probes to surface steps and surface-breaking rectangular slots in aluminum plates. This paper presents the results obtained using a commercial reflection probe (Nortec SPO-2065) and an SRI-constructed five-coil, air-core reflection probe to interrogate such surface discontinuities. The data obtained with the five-coil probe are then compared with the results of a theory for the spatial response of such a probe that has been developed at Stanford University [1].