Results 171 to 180 of about 11,598 (201)

Skin absorption studied by photoacoustic techniques

AIP Conference Proceedings, 2000
In this work we propose for the particular problem of penetration of substance into skin, a setup which is based on the conventional photoacoustic cell. In order to avoid some problems, intrinsic to the material under study and the sensibility of the technique, we use the thermal effusivity of the skin-substance system to monitor this phenomenon, in ...
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A Photoacoustic Technique for Depth-Resolved In Situ Monitoring of Biofilms

Environmental Science & Technology, 2002
Biofilms occur in natural and engineered water systems. Biofouling in technical processes lowers the water quality and increases the frictional resistance in tubes. In wastewater treatment plants, biofilms are used for removal of organic an inorganic pollutants.
T, Schmid, U, Panne, C, Haisch, M, Hausner, R, Niessner   +4 more
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Photoacoustic, photothermal, and related techniques: a review

Canadian Journal of Physics, 1986
A review is presented of the current theoretical and conceptual understanding of physical processes involved in photoacoustic and photothermal techniques, and in related techniques employing particle beams. Emphasis is given to recent developments, and to problems needing attention.
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Photoacoustic technique for determining optical absorption coefficients in solids

Applied Optics, 1977
An investigation was made of a photoacoustic technique for determining the optical absorption coefficient in solids. A train of laser pulses was passed through the solid, and a piezoelectric transducer attached directly to the sample measured the amplitude of the elastic wave generated by the absorbed radiation.
A, Hordvik, H, Schlossberg
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Photoacoustics: a hundred years old technique revisited

Journal of Optics, 1980
A sample is heated when it absorbs light. The authors investigate the different ways of detecting the temperature increase produced by this heating in the case of solids. If the light is modulated, one can either detect mechanical vibrations induced in the fluid surrounding the solid (photoacoustic effect) or measure the deflection undergone by a laser
J Badoz, D Fournier, A C Boccara
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Photoacoustic Elastography and Next-generation Photoacoustic Tomography Techniques Towards Clinical Translation

2018
Ultrasonically probing optical absorption, photoacoustic tomography (PAT) combines rich optical contrast with high ultrasonic resolution at depths beyond the optical diffusion limit. With consistent optical absorption contrast at different scales and highly scalable spatial resolution and penetration depth, PAT holds great promise as an important tool ...
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Photoacoustic Viscoelasticity Imaging Technique

2020
Sihua Yang, Da Xing
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Photoacoustic And Photothermal Techniques For Infra-Red Spectroscopy

SPIE Proceedings, 1988
Photoacoustic and photothermal techniques have found wide application in infra-red spectroscopy over the last few years. Samples are illuminated with amplitude modulated radiation which produces excited spectroscopic states. These excited states relax by radiationless de-excitation pathways producing a modulated heat source within the sample.
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Computational Techniques for Advancing Photoacoustic Microscopy

abstract
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Techniques to enhance the photoacoustic signal for trace gas sensing: A review

Sensors and Actuators A: Physical, 2022
Fupeng Wang, Jiachen Sun, Cunguang Zhu   +2 more
exaly