Results 1 to 10 of about 6,705 (186)

Photoacoustic spectroscopy of solids

The Journal of the Acoustical Society of America, 1973
There are a great many substances, both organic and inorganic, that, because of their physical state, cannot be readily studied by conventional absorption or reflection techniques. In photoacoustic spectroscopy, light absorbed by the sample is converted into a measurable acoustic signal, and spectra closely corresponding to optical absorption spectra ...
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Fourier Transform Photoacoustic Spectroscopy

Applied Physics Letters, 1978
Visible-light Fourier-transform photoacoustic spectroscopy (FTPAS) of Nd : glass is reported. The combined throughput and multiplex advantages of the interferometer significantly reduce the data collection time and/or improve the signal-to-noise ratio.
Michael M. Farrow, Roger K. Burnham, Edward M. Eyring   +2 more
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Standoff Photoacoustic Spectroscopy of Explosives

Applied Spectroscopy, 2016
Detection and identification of unknown and possibly hazardous materials is a vital area of research to which infrared (IR) spectroscopy is ideally suited. Infrared absorption spectra can be measured with many sensing paradigms of which photoacoustic spectroscopy (PAS) is a sensitive and flexible variant.
Logan S, Marcus, Ellen L, Holthoff, Paul M, Pellegrino   +2 more
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Applications of Resonant Photoacoustic Spectroscopy

Second International Meeting on Photoacoustic Spectroscopy, 1981
The apparatus employed consists of a laser as radiation source, a cylindrical resonator, and the signal processing system. The 3,39 µm or 1,15 µm beam of a He-Ne laser was intensity modulated by a chopper. The chopper frequency was continuously varied in an interval of 100 Hz around the selected acoustic resonance. In most measurements the first radial
J. Röper, K. Frank, P. Hess
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Resonant Photoacoustic Spectroscopy

1983
Nearly one hundred years after Bells discovery, resonant photoacoustic spectroscopy awoke from a long sleep. The introduction of lasers as radiation sources has led to rapid development of photoacoustics in the last ten years. Experimental results obtained under carefully optimized conditions are now in good agreement with theory of resonators.
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Development of photoacoustic spectroscopy with a piezofilm

Applied Optics, 2007
We have developed photoacoustic spectroscopy with a piezofilm. A piezofilm is a piezoelectric element made from plastic polyvinylidene fluoride having piezoelectrical effect. Photoacoustic spectra (375-675 nm) of water, dye aqueous solution, and benzene, are measured with a xenon lamp.
Yugo, Nosaka, Eiji, Tokunaga
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Photoacoustic Spectroscopy — Photoacoustic and Photothermal Effects

1990
Definition. Photoacoustic (PA) or optoacoustic measurements in the original, strict sense comprise the detection of acoustic waves which arise from non-radiative de-excitation (radiationless transition) of the sample as a consequence of absorption of continuously amplitude-modulated light.
C. Buschmann, H. Prehn
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Photoacoustic spectroscopy for process analysis

Analytical and Bioanalytical Chemistry, 2005
Photoacoustic spectroscopy (PAS) is based on the absorption of electromagnetic radiation by analyte molecules. The absorbed energy is measured by detecting pressure fluctuations in the form of sound waves or shock pulses. In contrast to conventional absorption spectroscopy (such as UV/Vis spectroscopy), PAS allows the determination of absorption ...
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Photoacoustic Correlation Spectroscopy

Optical Remote Sensing of the Atmosphere, 1990
Photoacoustic (PA) correlation spectroscopy offers some advantages over conventional correlation spectroscopy in that the PA detector requires no cooling. The method has been proposed earlier (Perlmutter, *et al) , but was not considered sensitive enough to warrant further work.
P. Shakkottai, J. S. Margolis
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Photoacoustic Spectroscopy of Biological Materials

Science, 1973
A new technique for performing optical spectroscopy on solids has been developed. Photoacoustic spectra of cytochrome c and hemoglobin show how this technique can be used to obtain information about optical absorptions and subsequent de-excitations in solid biological materials, particularly those which cannot readily be studied by conventional means.
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