Smartphone turns into eddy current instrument

Speaker:
Mook, Gerhard; Otto-von-Guericke-University Magdeburg Institut of Materials and Joining; Germany

Authors:
Mook, G.; Otto-von-Guericke-University Magdeburg; Germany
Simonin, Y.; Otto-von-Guericke-University Magdeburg; Germany

ID: ECNDT-0079-2018
Download: PDF

Smartphone turns into eddy current instrument

Gerhard Mook, Yury Simonin
Otto-von-Guericke-University Magdeburg, Germany, mook@ovgu.de

Abstract

The paper answers the question how to inspire young people for non-destructive testing using eddy current method.
In contrast to other non-destructive inspection methods eddy current is comparably complicated because of its missing imaginability. Nobody can feel electromagnetic fields or even the superposition of alternating fields.
Of course, it is possible to calculate these fields and the results for typical situations are well known. But for learning the method one need an easy to handle real instrument and simple reference pieces.
Every student uses a smartphone. These devices bring all components along needed for eddy currents. The audio interface lets transmit and receive alternating signal up to 20 kHz. Why not use for eddy currents?
We present an eddy current probe directly attachable to the audio jack and an app for eddy current inspection with all necessary components: xy plane indication, frequency, gain, phase and filter setting and a recorder with post processing capabilities.
Together with the probe simple reference pieces help to become familiar with probe handling and parameter setting.