Applications of Barker coded infrared imaging method for characterisation of glass fibre reinforced plastic materials. Issue 17 (1st August 2013)

• Record Type: Journal Article
• Authors: Dua, G.; Mulaveesala, R.
• Is Part Of: Electronics letters. Volume 49:Issue 17(2013)
• Page Start: 1071
• Page End: 1073
• Publication Date: 2013-08-01
• Subjects: glass fibre reinforced plastics -- Hilbert transforms -- infrared imaging -- nondestructive testing; Barker coded infrared imaging method -- glass fibre reinforced plastic materials -- thermal nondestructive testing methods -- nonstationary thermal nondestructive testing -- indispensable approach -- sinusoidal modulated thermographic techniques -- Hilbert transform; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2013.1661
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : Among various widely used thermal non‐destructive testing methods, non‐stationary thermal non‐destructive testing modalities have proved to be an indispensable approach for the inspection and evaluation of various solid materials. These techniques facilitate the use of low peak power heat sources in a moderate time compared with the conventional widely used pulsed and sinusoidal modulated (lock‐in) thermographic techniques. In this reported work, Barker non‐stationary excitation followed by Hilbert transform‐based matched filtering for the detection of subsurface features lying deep inside a glass fibre‐reinforced plastic test sample is incorporated. Results obtained from this pulse compression approach are less affected by random noise generated inside the test sample during experimentation as well as the variations of surface emissivity over the test sample. A comparison has been carried out among the amplitude, time delay and phase images obtained for the experimentally matched filter data.