LED optical excitation for the long pulse and lock-in thermographic techniques

S.G. Pickering; K. Chatterjee; D.P. Almond; S. Tuli

doi:10.1016/j.ndteint.2013.04.009

LED optical excitation for the long pulse and lock-in thermographic techniques

S.G. Pickering, K. Chatterjee, D.P. Almond, S. Tuli

Department of Mechanical Engineering

Indian Institute of Technology

Research output: Contribution to journal › Article › peer-review

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Abstract

High power light emitting diode (LED) arrays have been investigated as excitation sources for long pulse and lock-in thermography. Images of artificial defects in a carbon fibre reinforced plastic (CFRP) composite sample are compared, by image contrast signal-to-noise ratio estimates, with those obtained using conventional incandescent flash and lock-in excitation sources. The LED arrays had to be mounted on heat sinks with active cooling in to prevent them exceeding their thermal tolerance. Despite this cooling the LED arrays were still found to emit some IR radiation, although far less than conventional incandescent light sources.

Original language	English
Pages (from-to)	72-77
Number of pages	6
Journal	NDT and E International
Volume	58
DOIs	https://doi.org/10.1016/j.ndteint.2013.04.009
Publication status	Published - Sept 2013

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10.1016/j.ndteint.2013.04.009

Author's accepted version
NOTICE: this is the author’s version of a work that was accepted for publication in NDT & E International. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in NDT & E International, vol 58, 2013, DOI 10.1016/j.ndteint.2013.04.009
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title = "LED optical excitation for the long pulse and lock-in thermographic techniques",

abstract = "High power light emitting diode (LED) arrays have been investigated as excitation sources for long pulse and lock-in thermography. Images of artificial defects in a carbon fibre reinforced plastic (CFRP) composite sample are compared, by image contrast signal-to-noise ratio estimates, with those obtained using conventional incandescent flash and lock-in excitation sources. The LED arrays had to be mounted on heat sinks with active cooling in to prevent them exceeding their thermal tolerance. Despite this cooling the LED arrays were still found to emit some IR radiation, although far less than conventional incandescent light sources. ",

author = "S.G. Pickering and K. Chatterjee and D.P. Almond and S. Tuli",

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AU - Pickering, S.G.

AU - Chatterjee, K.

AU - Almond, D.P.

AU - Tuli, S.

PY - 2013/9

Y1 - 2013/9

N2 - High power light emitting diode (LED) arrays have been investigated as excitation sources for long pulse and lock-in thermography. Images of artificial defects in a carbon fibre reinforced plastic (CFRP) composite sample are compared, by image contrast signal-to-noise ratio estimates, with those obtained using conventional incandescent flash and lock-in excitation sources. The LED arrays had to be mounted on heat sinks with active cooling in to prevent them exceeding their thermal tolerance. Despite this cooling the LED arrays were still found to emit some IR radiation, although far less than conventional incandescent light sources.

AB - High power light emitting diode (LED) arrays have been investigated as excitation sources for long pulse and lock-in thermography. Images of artificial defects in a carbon fibre reinforced plastic (CFRP) composite sample are compared, by image contrast signal-to-noise ratio estimates, with those obtained using conventional incandescent flash and lock-in excitation sources. The LED arrays had to be mounted on heat sinks with active cooling in to prevent them exceeding their thermal tolerance. Despite this cooling the LED arrays were still found to emit some IR radiation, although far less than conventional incandescent light sources.

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UR - http://dx.doi.org/10.1016/j.ndteint.2013.04.009

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VL - 58

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JO - NDT and E International

JF - NDT and E International

ER -

LED optical excitation for the long pulse and lock-in thermographic techniques

Abstract

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