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Photoacoustic effect in stressed elastic solids
Journal of Applied Physics, 2000A multimode approach based on the simultaneous application of several photothermal and photoacoustic methods is proposed for the study of thermal and thermoelastic effects in solids with residual stress. It includes photoacoustic gas microphone, photodeflection, photoreflectance and photoacoustic piezoelectric microscopy methods. This approach provides
K. L. Muratikov +3 more
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Light scattering effects in photoacoustic spectroscopy
Journal of Applied Physics, 1980The influence of light scattering on photoacoustic signals is treated. Theoretical and experimental results are compared. The theoretical results are based on a model in which the photons diffuse through the sample. An equation governing the diffusion process is solved with appropriate boundary conditions.
Per Helander +2 more
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, 2020
A generalized theoretical model of the formation of a thermoelastic photoacoustic signal from real materials is proposed taking into account the presence of defects and impurities.
A. Glazov, K. Muratikov
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A generalized theoretical model of the formation of a thermoelastic photoacoustic signal from real materials is proposed taking into account the presence of defects and impurities.
A. Glazov, K. Muratikov
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Applied Physics Letters
Viscoelastic characterization of biological tissue has significant biomedical value. In this study, we propose a wavelet-based photoacoustic viscoelastographic microscopy to characterize the viscoelasticity of tissues beneath the optical scattering depth from photoacoustic oscillation signals.
Yang Liu +5 more
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Viscoelastic characterization of biological tissue has significant biomedical value. In this study, we propose a wavelet-based photoacoustic viscoelastographic microscopy to characterize the viscoelasticity of tissues beneath the optical scattering depth from photoacoustic oscillation signals.
Yang Liu +5 more
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Thermal contact probing by photoacoustic effect
Applied Physics Letters, 1981The influence on the photoacoustic signal of the thermal contact resistance at the interface sample substrate is investigated using a thin metallic foil (thickness ∼12.5 μm) as sample. The foil is either applied by pressure against the substrate or epoxyed on it.
J.-P. Monchalin +3 more
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Photoacoustic effect in piezoelectric ceramics
Journal of the Optical Society of America, 1980Audiofrequency signals produced by the absorption of chopped light in silvered piezoelectric ceramic discs have been measured as a function of chopping frequency, optical wavelength, optical power, transducer size, and size of illuminated area. The results show that the detected signal varies inversely as ω, is not strongly wavelength dependent in the ...
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Biomass monitoring using the photoacoustic effect
Sensors and Actuators B: Chemical, 1998Abstract Photoacoustic spectroscopy was evaluated as useful for the determination of the number of cells in a fermentation. The influence of scattering particles and gas bubbles on the measurement was investigated. The photoacoustic method is much less influenced by scattering particles than the turbidity method.
Kai Schmidt, Dieter Beckmann
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Photoacoustic effect with thermally thin solids
Applied Physics Letters, 1980Photoacoustic signals from opaque thermally thin solids (Ni, Al, and SiC) with a gas backing have an ω−3/2 frequency dependence. This first experimental observation of such a dependence from thin solids is in excellent agreement with the Rosencwaig-Gersho theory when a low-conductivity backing material is considered, but in disagreement with ...
Thomas P. Crowley +2 more
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Applied Optics, 2019
While berberine, a traditional Oriental herbal drug commonly used for treatment of diarrhea, has recently been used to treat a number of brain disorders, such as stroke and Alzheimer's disease, berberine-induced changes in hemodynamics are largely ...
Dan Wu +5 more
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While berberine, a traditional Oriental herbal drug commonly used for treatment of diarrhea, has recently been used to treat a number of brain disorders, such as stroke and Alzheimer's disease, berberine-induced changes in hemodynamics are largely ...
Dan Wu +5 more
semanticscholar +1 more source
Photoacoustic Doppler Effect and Flow Sensing
2017This chapter focuses on the principle of the photoacoustic Doppler (PAD) effect from moving particles, and discusses its potential use in flow sensing. In the PAD effect, the photoacoustic source and the detector move relative to each other while the laser beam is stationary.
Hui Fang, Lihong V. Wang
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