A schematic diagram of the combined OPC and PD experimental apparatus. and stand for mirrors and lenses, respectively.
(a) Frequency spectra of the OPC signal for the -thick Al-foil (open squares) and -thick Al-foil coated with -thick CL, namely AL53CL53 (open circles) samples. The doted line represents the dependence of the modulation frequency, and (b) the resonant response curve for the OPC chamber.
Normalized OPC signal amplitude as a function of the modulation frequency for (a) the -thick Al-foil and three -thick Al-foil coated with (b) -thick (AL53CL13), (c) -thick (AL53CL37), and (d) -thick (AL53CL53) layers of CL. The solid lines represent the data fitting to Eq. (2).
Effective thermal diffusivity data as obtained from the normalized OPC signal amplitude data fitting for the Al-CL samples as a function of the thickness ratio parameter . The solid lines represent the data fitting to Eq. (3). The dotted line represents the prediction of Eq. (3) for the case .
Fundamental PD signals vs modulation frequency for the GC and AL53CL53 samples. The continuous lines represent the best curve fitting using . The fitted are also indicated.
Experimental measurement results.
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