Generalized theory of the photoacoustic effect
作者:
F. Alan McDonald,
Grover C. Wetsel,
期刊:
Journal of Applied Physics
(AIP Available online 1978)
卷期:
Volume 49,
issue 4
页码: 2313-2322
ISSN:0021-8979
年代: 1978
DOI:10.1063/1.325116
出版商: AIP
数据来源: AIP
摘要:
The theory of the photoacoustic effect is extended to include the contribution of mechanical vibration of the sample. Coupled equations for thermal and acoustic waves are solved in both sample and gas. It is shown that the pressure signal in the gas may be significantly affected by acoustic coupling in the sample, and experimental confirmation of this extended theory is given. The results of the fully coupled treatment are shown to be accurately reproduced by an extension of the Rosencwaig piston model: the pistonlike motion of the gas boundary layer adjoining the sample is superimposed on the mechanical vibration of the sample surface to give a composite piston displacement which then produces the pressure signal in the gas. The composite‐piston model provides relatively simple algebraic results applicable to many cases of physical interest.
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