| Thermoelastic equivalent circuit for laser ultrasound |
| |
| 作者姓名： | LI Zhichun |
| |
| 作者单位： | Institute of Acoustics，Tongji University，Shanghai 200092 |
| |
| 摘 要： | I.IntroductionItiswe11knownthatultrasonicwavecanbegenerated'bytherma1expansionwhenalaserbeamisincidentonsamples.Accordingto1incarthcory,laserultrasonicsignalcanbcderivedfromtheso1utionofthermoe1asticdifferentialcquationinwho1espacc.Asanimportantparameter,theamp1itudeofsoundwavehasbeenappliedtoquantitutivemeas.rements'-3l.Recentpapersbegintofocusonanotherconsiderablecharactcr-thctempora1profileofultrasonicsignalwhoscfrequencyandphasespectruminvolvemoreinfOrmationofmaterialproperhesl~8l.And,c…
|
Thermoelastic equivalent circuit for laser ultrasound |
| |
| Authors: | LI Zhichun |
| |
| Abstract: | On the basis of thermoelastic theory, a thermoelastic equivalent circuit model for laser-generated ultrasound has been proposed. With this model, laser-heated region is des cribed as a three-port electrical circuit which interprets the direct conversion bctween thermal energy and elastic energy. As the circuit is derived from single frequency excitation, arbitrary temporal response can be calculated by means of IFFT algorithm. In this paper, three kinds of ideal heated regions are considered which arc circular plate, cylinder and sphere, the corre spondent one-dimensional adiabatic thermoelastic equivalent circuits are completed, and their pressure responses are calculated. It is shown that the results agree well with previous reports. |
| |
| Keywords: | Thermoelastic equivalent circuit Heat current Heat capacity |
| 本文献已被 CNKI 等数据库收录！ |
