Influence of gas viscosity on the photoacoustic signal in gas-microphone cells
- 15 April 1986
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 59 (8) , 2944-2949
- https://doi.org/10.1063/1.336957
Abstract
We report the experimentally observed variation of the phase angle φ of the photoacoustic (PA) signal as a function of coupling ‘‘gas column thickness’’ for a one‐dimensional PA cell. The PA signal is excited by a modulated continuous laser beam incident on an opaque solid surface, and the gas column thickness is the distance between the solid surface and the window for the incident laser beam. We show that the observed data can be explained in a PA model (called the extended Rosencwaig–Gersho model) which includes the consideration of a residual volume in the PA cell, together with the consideration of viscous damping of the PA signal at small gas column thickness. The effect of viscosity is visible already for gas column thickness of the order of magnitude of one thermal diffusion length.This publication has 7 references indexed in Scilit:
- Effect of coupling gas viscosity on the photoacoustic signalApplied Physics Letters, 1985
- On the thermodynamics of the photoacoustic effect of condensed matter in gas cellsApplied Physics B Laser and Optics, 1983
- Optimization of optoacoustic cell for depth profiling studies of semiconductor surfacesApplied Physics Letters, 1980
- Generalized theory of the photoacoustic effectJournal of Applied Physics, 1978
- Size considerations in the design of cells for photoacoustic spectroscopyJournal of Applied Physics, 1977
- Theory of the photoacoustic effect with solidsJournal of Applied Physics, 1976
- Optical Absorption in Glass: Investigation Using an Acoustic TechniqueApplied Optics, 1973