High temperature pulsed photoacoustic studies of solids

Author

Schindel, D.W. ; Hutchins, D.A. ; Farahbakhsh, B. ; Smith, S.

Author_Institution

Dept. of Phys., Queen´´s Univ., Kingston, Ont., Canada

fYear

1990

fDate

4-7 Dec 1990

Firstpage

645

Abstract

A noncontact laser system has been designed which utilizes a pulsed photoacoustic source and interferometric detection to allow the absolute velocity of surface waves to be determined accurately at temperatures up to 1000°C. Studies were carried out on aluminum to check the constancy of the calibration with changing temperature before undertaking the (001) plane of silicon. Data are presented for both at temperatures up to 800°C. Measurements of the velocity anisotropy at room temperature on the (001) crystalline face of Si confirm the quoted 1% accuracy and suggest a confirmation of the frequency dependence of the generation efficiency of the various surface waves. Systems such as this could prove useful in materials characterization at elevated temperatures

Keywords

Rayleigh waves; aluminium; elemental semiconductors; high-temperature techniques; light interferometry; measurement by laser beam; photoacoustic effect; silicon; surface acoustic waves; ultrasonic velocity; ultrasonic velocity measurement; (001) crystalline face; 20 to 800 degC; Al; Rayleigh wave; Si; frequency dependence; high temperature; interferometric detection; materials characterization; noncontact laser system; pulsed photoacoustic source; surface elastic waves; surface wave anisotropy; surface wave velocity; velocity anisotropy; Aluminum; Calibration; Frequency measurement; Optical design; Optical pulses; Silicon; Solids; Surface emitting lasers; Surface waves; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1990. Proceedings., IEEE 1990

Conference_Location

Honolulu, HI

Type

conf

DOI

10.1109/ULTSYM.1990.171443

Filename

171443