Thermal memory effects to photothermal pulse response

• Published in: Hemijska industrija Vol. 61; no. 2; pp. 66 - 70
• Main Authors: Popovic, Marica, Stojanovic, Zoran, Galovic, Slobodanka
• Format: Journal Article
• Language: English; Serbian
• Published: Belgrade Hemijska Industrija 01.01.2007; Association of Chemical Engineers of Serbia
• Subjects: heat propagation rate; Mathematical models; photothermal pulse methods; photothermal time response; thermal memory; thermal relaxation time; thermophysical parameters
• ISSN: 0367-598X; 2217-7426
• DOI: 10.2298/HEMIND0702066P

An analytical model that describes surface temperature variations of media with thermal memory stimulated by laser pulses was developed. The influence of thermal memory for semi infinite sample was analyzed by comparing our results with classical model results which neglect the thermal memory of materials for different pulse widths and for different pulse shapes. It was shown that this influence was outstanding around steep changes of the incentive flux and for short incident pulses. Izlozen je analiticki model koji opisuje povrsinske temperaturske varijacije sredina sa toplotnom memorijom pobudjenih laserskim impulsima. Analiziran je uticaj toplotne memorije poredjenjem dobijenih rezultata sa rezultatima klasicnih modela, koji zanemaruju toplotnu memoriju materijala, za razlicite duzine impulsa i za razlicite oblike impulsne pobude na primeru polubeskonacnog uzorka. Pokazano je da je ovaj uticaj izrazen u okolini strmih promena pobudnog fluksa i pri kratkim pobudnim impulsima.