Presenter Information

Walter Podney, SQM Technology, Inc.

Location

La Jolla, CA

Start Date

1-1-1998 12:00 AM

Description

An ELECTROMAGNETIC MICROSCOPE uses a superconductive quantum interference device (SQUID) to achieve high resolution1 at low frequencies (≲ 100 Hz), for deep, eddy current evaluation of airframes [1–3]. The probe is a reflection type, with a superconductive source coil and a superconductive pickup loop that couples inductively to a remote SQUID. The SQUID measures change in mutual inductance2 between the source and pickup coils, measured in picohenries (pH). A description of the change in mutual inductance follows from vector potentials of the source and pickup coils. To first order, their scalar product describes the response of a probe.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

17A

Chapter

Chapter 4: NDE Sensors and Fields

Section

Electromagnetic Sensors

Pages

1025-1031

DOI

10.1007/978-1-4615-5339-7_132

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Response Function of an Electromagnetic Microscope

La Jolla, CA

An ELECTROMAGNETIC MICROSCOPE uses a superconductive quantum interference device (SQUID) to achieve high resolution1 at low frequencies (≲ 100 Hz), for deep, eddy current evaluation of airframes [1–3]. The probe is a reflection type, with a superconductive source coil and a superconductive pickup loop that couples inductively to a remote SQUID. The SQUID measures change in mutual inductance2 between the source and pickup coils, measured in picohenries (pH). A description of the change in mutual inductance follows from vector potentials of the source and pickup coils. To first order, their scalar product describes the response of a probe.