Location

La Jolla, CA

Start Date

1-1-1998 12:00 AM

Description

Because of their unparallelled sensitivity, bandwidth, and spatial resolution, Superconducting Quantum Interference Device (SQUID) magnetometers are unequalled in their ability to image the temporal and spatial variation of weak, low frequency magnetic field. For eddy current NDE, SQUIDs can be used with a low frequency excitation current to image cracks or material loss deep in aluminum structures. To detect the subsurface cracks adjacent to a fastener in multilayer aircraft structures, SQUID NDE measurements have utilized a sheet inducer [1] combined with depthselective techniques [2, 3], a gridiron coil inducer combined with pulsed eddy current techniques [4], and a double-D inducer [5].

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

17A

Chapter

Chapter 4: NDE Sensors and Fields

Section

Electromagnetic Sensors

Pages

1067-1074

DOI

10.1007/978-1-4615-5339-7_138

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

SQUID Magnetometers for Depth-Selective, Oriented Eddy Current Imaging

La Jolla, CA

Because of their unparallelled sensitivity, bandwidth, and spatial resolution, Superconducting Quantum Interference Device (SQUID) magnetometers are unequalled in their ability to image the temporal and spatial variation of weak, low frequency magnetic field. For eddy current NDE, SQUIDs can be used with a low frequency excitation current to image cracks or material loss deep in aluminum structures. To detect the subsurface cracks adjacent to a fastener in multilayer aircraft structures, SQUID NDE measurements have utilized a sheet inducer [1] combined with depthselective techniques [2, 3], a gridiron coil inducer combined with pulsed eddy current techniques [4], and a double-D inducer [5].