Thermal parameters of dental materials determined by photoacoustic phase lag measurements
作者:
C. A. Pela´,
S. Rocha,
E. de Paula,
O. Baffa,
期刊:
Review of Scientific Instruments
(AIP Available online 1998)
卷期:
Volume 69,
issue 9
页码: 3392-3397
ISSN:0034-6748
年代: 1998
DOI:10.1063/1.1149105
出版商: AIP
数据来源: AIP
摘要:
A method of measuring the phase lag of the photoacoustic signal obtained by rear surface excitation is employed for the determination of the thermal properties of insulating dental materials such as calcium hydroxide cement, a cavitary varnish and photopolymerized restoration resins. Disk shaped dental materials were glued to the front surface of the thin metal foil window of the photoacoustic cell and illuminated by pulsed light. A three layer model was developed to fit the measurements of the phase angle as a function of the frequency of excitation. The thermal diffusivity and conductivity of the dental material were determined to good precision. The instrumentation employed in the present work is simple and easily obtainable by any laboratory. ©1998 American Institute of Physics.
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