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Fast Transmission Photothermal Radiometry via Sampling by an Internal Computer Sound Card.pdf

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JOURNALOFELECTRONIC SCIENCEAND TECHNOLOGY,VOL．13，NO．1，MARCH 2015 73 FastTransm issionPhotothermalRadiometryvia SamplingbyanInternalComputerSoundCard Lai—JunYan，Chun—MingGao，Bin-XingZhao，Qi-MingSun，andFengWang AbstractDuringthelastfew decades，photothermal field ofphotoacoustic and phototherlTlalphenomenonl【J． radiometry (PTR)hasbeen greatly developed and Duringthe1astfew decades．thePTR techniquehasbeen widely appfied in the field ofnondestructive testing． greatlydevelopedandextensivelystudiedworldwidedrawn However, the traditional PTR system employs an by itshigh sensitivity,high secufity,andhighresolution． expensive lock-in amplifier to detect the weak ThePTR techniquehasbeenwidelyappliedinthefieldof photothermalsignal，whichleadstohighcostandlong nondestructivetesting，includingsurfacecracksimaging testtime．InthispapeL afasttransm issionPTR system deep subsurface defects detectionj【J．hairline crack basedon samplingbyusingan internalcomputersound detectiont． quantitativeevaluationofthekineticsofhuman cardwasdevelopedtolowerthesystem costandshorter enamel simulated caries【． industrial steel hardness inspection[制 thetesttime．A pieceofamorphoussificon a【：Si1thin ． thermal diffusivity determination of film solarcellswith artificialdefectswaspreparedand polymerizeddentalresins_J／．propertiescharacterizationof tested by the system． The resuIts show that the semiconductor materials[sJ， and thermal conductiviyt sharpened defectscan beidentified easily and quicklY measurement of thin filmst and surface roughness according to the significant peaks of the priginal investigationt11J