简介：Thephotoacousticmodelofmultilayerwithastrong-absorbingsurfacelayerisdeveloped.Thephaseofph0toacoustiesignalismeasuredasafunctionofmodulatedfrequencyusingapparatustotallycontrolledbyacomputersystem.Thethermaldiffusivity,effusivityaswellasthicknessofseveralburiedlayersareobtainedindependentlythroughthebestfitofexperimentaldataaccordingtothetheoreticalmodel.Themultilayersofthinmetalandalloyfilmareinvestigated.Thismethodisprovedtobevaluableparticularlyinnondestructiveexaminationofsubsurfacephysicalproperties.
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