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Abstract
As groundwork for thickness determination of polymeric surface protection systems for concrete, we present a method for measuring the thickness of isolated semitransparent solids using flash thermography both in transmission and reflection configuration. Since standard models do not capture semitransparency, an advanced analytical model by Salazar et al. is applied. Physical material parameters are deduced by fitting experimental data from samples of well-known thickness. Using those, the thickness of samples of the material can be obtained by fitting, as demonstrated for different semitransparent polymer materials.
Notes
1. Note that the aforementioned methods rely on analysis of first or even second derivatives of the measured signal.
2. Note that the term includes the energy density Q in Ref. [Citation2], while here we use a normalised pulse shape
and a separate energy density Q.
3. The energy density is already accounted for by the parameter Q, the normalisation for P0 is: .
4. and
are not results of the calibration since they remain as free fit parameters for thickness determination.