photoacoustic spectroscopy


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photoacoustic spectroscopy

[¦fōd·ō·ə¦kü·stik spek′träs·kə·pē]
(spectroscopy)
A spectroscopic technique for investigating solid and semisolid materials, in which the sample is placed in a closed chamber filled with a gas such as air and illuminated with monochromatic radiation of any desired wavelength, with intensity modulated at some suitable acoustic frequency; absorption of radiation results in a periodic heat flow from the sample, which generates sound that is detected by a sensitive microphone attached to the chamber. Abbreviated PAS. Also known as optoacoustic spectroscopy.
References in periodicals archive ?
Photoacoustics and Photoacoustic Spectroscopy, Wiley, New York, p.
Quantitative Depth Profiling of Layered Samples Using Phase-Modulation FT-IR Photoacoustic Spectroscopy," Appl.
Determination of melanin in human hair by photoacoustic spectroscopy.
Pulsed photoacoustic spectroscopy applied to the diffusion of sunscreen chromophores in human skin: the weakly absorbent regime.
By using a laser and very sensitive microphones--in a technique called laser photoacoustic spectroscopy (LPAS)--vanishingly low concentrations of gases, at parts per billion or even parts per trillion levels, can be detected.
The module is also designed to be integrated into a variety of spectroscopic instruments, including products used in the fields of Photoacoustic Spectroscopy (PAS), Cavity Ring-Down Spectroscopy (CRDS), Infrared Microscopy, and Atomic Force Microscopy (AFM).
For the past several years, our research group has developed quantitative photoacoustic spectroscopy imaging techniques and applied them to mouse models of cancer," said Dr.