Defect-depth dependence of optimal frequency and spatial resolution in SQUID based NDE

Author

Shanehsazzadeh, Faezeh ; Rostami, Behnush ; Sadeghi, Sanaz ; Rahbar, Faezeh ; Sarreshtedari, Farrokh ; Kokabi, Hamid ; Banzet, Marko ; Schubert, Jurgen ; Fardmanesh, Mehdi

Author_Institution

Supercond. Electron. Res. Lab., Sharif Univ. of Technol., Tehran, Iran

fYear

2015

fDate

10-14 May 2015

Firstpage

1411

Lastpage

1414

Abstract

We have investigated the relationship between the excitation frequency and the depth of the flaws in our SQUID based NDE system to achieve optimum frequency for the detection of each particular flaw depth in the metallic samples. Also, the system resolution defined as the gap´s distance between the two edges of a crack in the samples, have been experimentally investigated and the dependency to the frequency and the input excitation voltage amplitude was found. Afterwards, we have simulated the system in COMSOL Multiphysics using a basic model for the coils, and examined some special flaws to obtain their effects on the magnetic flux density caused by the eddy current distribution.

Keywords

SQUIDs; crack detection; eddy currents; frequency measurement; magnetic flux; mechanical variables measurement; sensors; spatial variables measurement; superconducting coils; COMSOL Multiphysics simulation; NDE system; SQUID; coil; crack; defect-depth dependence; eddy current distribution; excitation frequency; flaw depth detection; gap distance; input excitation voltage amplitude; magnetic flux density; metallic sample; nondestructive evaluation; spatial resolution; Conferences; Decision support systems; Electrical engineering; Eddy current; Optimal frequency; SQUID based NDE system; magnetic flux density;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Engineering (ICEE), 2015 23rd Iranian Conference on

Conference_Location

Tehran

Print_ISBN

978-1-4799-1971-0

Type

conf

DOI

10.1109/IranianCEE.2015.7146441

Filename

7146441