SQUID Nondestructive Testing System With Vibrating Normal Pick-Up Coil

Author

Hirano, Satoru ; Inada, Yuushi ; Matsumoto, Eiichi ; Saito, Atsushi ; Aizawa, Keiji ; Matsuda, Mizushi ; Kuriki, Shinya ; Ohshima, Shigetoshi

Author_Institution

Yamagata Univ., Yonezawa

Volume

17

Issue

2

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

788

Lastpage

791

Abstract

A vibrating normal pick-up coil coupled to a superconducting quantum interference device (SQUID) magnetometer as a nondestructive testing system was studied. The vibrating normal pick-up coil measures the magnetic field gradient at a point. Output of the SQUID magnetometer is lock-in detected at the vibration frequency. The frequency of an excitation magnetic field can be set low to detect deep structural flaws. The use of a normal coil vibrated at 20 kHz with output voltage amplified by a low-noise amplifier enabled detection of a cylindrical defect in an aluminum plate with an excitation magnetic field at 40 Hz.

Keywords

SQUID magnetometers; coils; low noise amplifiers; nondestructive testing; SQUID magnetometer; aluminum plate; excitation magnetic field; frequency 40 Hz; low-noise amplifier; magnetic field gradient; nondestructive testing; pick-up coil; superconducting quantum interference device; vibration frequency; Couplings; Frequency; Interference; Magnetic field measurement; Nondestructive testing; SQUID magnetometers; Superconducting coils; Superconducting devices; Vibration measurement; Voltage; Gradiometer; SQUIDs; nondestructive testing;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2007.898588

Filename

4277449