Design of a pulsed eddy current sensor for detection of defects in aircraft lap-joints

This paper presents a new type of pulsed eddy current (PEC) sensor that has been designed for defect detection in aircraft lap-joint structures. The sensor employs a new excitation circuit that requires no additional signal amplification and the paper also reports compensation techniques that improv...

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Veröffentlicht in:	Sensors and actuators. A. Physical. 2002-09, Vol.101 (1), p.92-98
Hauptverfasser:	Sophian, Ali, Tian, Gui Yun, Taylor, David, Rudlin, John
Format:	Artikel
Sprache:	eng
Schlagworte:	Aircraft NDT Cross-disciplinary physics: materials science rheology Digital compensation Exact sciences and technology Feature extraction Instruments, apparatus, components and techniques common to several branches of physics and astronomy Magnetic components, instruments and techniques Magnetic sensor Materials science Materials testing Nondestructive testing: electromagnetic testing, eddy-current testing Physics Pulsed eddy current (PEC) sensor Transient response
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Beschreibung
Zusammenfassung:	This paper presents a new type of pulsed eddy current (PEC) sensor that has been designed for defect detection in aircraft lap-joint structures. The sensor employs a new excitation circuit that requires no additional signal amplification and the paper also reports compensation techniques that improve the sensing resolution and stability. A new hybrid feature of the peak value in time domain and the maximum frequency magnitude in frequency domain has been investigated. A test rig has been built and some results from aircraft samples are presented.
ISSN:	0924-4247 1873-3069
DOI:	10.1016/S0924-4247(02)00195-4