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Thermal wave thickness measurement of primer on grit-blasted steel

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Abstract:

A thermal wave method is described for making non-contact measurements of primer layer thickness on grit-blasted steel surfaces. Measurements were made using a small, purpose-designed unit, whereby the surface phase of a thermal wave (generated using a modulated semiconducting laser) was measured relative to the phase of a laser heating source. It was shown that the method had an intrinsic accuracy of ∼±0.1 μm and an absolute accuracy that was limited to ∼±2 μm because of the uncertainty in paint thermal conductivity. Thermal wave measurements of thickness agreed within the experimental errors with those obtained using an independent contact measurement device. The variation in accuracy was also estimated as a result of stand-off error, integration time and power levels.

Keywords: GRIT-BLASTED STEEL SURFACES; PHASE; PRIMER LAYER THICKNESS; THERMAL WAVE THICKNESS MEASUREMENT

Document Type: Research Article

DOI: http://dx.doi.org/10.1784/insi.2012.54.10.557

Publication date: October 1, 2012

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