This work describes the development of an IR-NDT procedure based on a lock-in signal treatment in the frequency domain to obtain phase-contrast defect signatures. Heat stimulation is obtained by periodically shattering a common low-power halogen lamp. The delivered heat is then modulated as a train of square waves with multi-frequency harmonic content. The proposed lock-in algorithm is able to selectively retrieve phase and amplitude information at various frequencies of the acquired temperature, acting also as a narrow band filter to improve defect-signature to noise ratio. The procedure is implemented and evaluated by means of low cost IR equipment to investigate artificially defected thick Glass Reinforced Plastic (GRP) panels.

Pitarresi, G. (2012). Implementation of a fast and low cost IR-NDT technique by means of a Square Pulse Modulated Lock-In Thermography. In E-book Proceedings - 11th International Conference on Quantitative InfraRed Thermography. Gennaro Cardone.

Implementation of a fast and low cost IR-NDT technique by means of a Square Pulse Modulated Lock-In Thermography

PITARRESI, Giuseppe
2012-01-01

Abstract

This work describes the development of an IR-NDT procedure based on a lock-in signal treatment in the frequency domain to obtain phase-contrast defect signatures. Heat stimulation is obtained by periodically shattering a common low-power halogen lamp. The delivered heat is then modulated as a train of square waves with multi-frequency harmonic content. The proposed lock-in algorithm is able to selectively retrieve phase and amplitude information at various frequencies of the acquired temperature, acting also as a narrow band filter to improve defect-signature to noise ratio. The procedure is implemented and evaluated by means of low cost IR equipment to investigate artificially defected thick Glass Reinforced Plastic (GRP) panels.
Settore ING-IND/14 - Progettazione Meccanica E Costruzione Di Macchine
giu-2012
11th International Conference on Quantitative InfraRed Thermography
Napoli
11-14 Giugno 2012
00
paper ID 343
Pitarresi, G. (2012). Implementation of a fast and low cost IR-NDT technique by means of a Square Pulse Modulated Lock-In Thermography. In E-book Proceedings - 11th International Conference on Quantitative InfraRed Thermography. Gennaro Cardone.
Proceedings (atti dei congressi)
Pitarresi, G
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/64846
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