Skip to main content

Optimal sensor design and digital signal processing techniques for remote field eddy current testing

Buy Article:

$25.00 plus tax (Refund Policy)

Abstract:

Applications of remote field eddy current testing are severely restricted by disadvantages such as weak signals and over-long sensors. New methods used to overcome these disadvantages are investigated as follows: firstly, optimal sensor design methods including shielding and magnetic circuits are introduced to shorten the length of the sensor and enhance signal magnitude, and finite element method (FEM) is used to determine appropriate sensor length so as to get an optimal design compromise between sensitivity and signal magnitude. At the same time, a data acquisition system with orthogonal lock-in amplifier is used for weak signal measurement. Secondly, advanced digital signal processing techniques such as the homomorphic filter, wavelet transform and error correction are investigated to ensure detection reliability. Lastly, experimental results are presented showing that better performance has been achieved.

Document Type: Research Article

DOI: https://doi.org/10.1784/insi.2006.48.7.421

Affiliations: Institute of Mechanical and Electrical, Engineering, National University of Defense Technology, Changsha, China.

Publication date: 2006-07-01

More about this publication?
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more