Results 151 to 160 of about 6,759 (194)
Some of the next articles are maybe not open access.
Resonant Photoacoustic Spectroscopy
1983Nearly 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.
openaire +1 more source
Fourier Transform Photoacoustic Spectroscopy
Applied Physics Letters, 1978Visible-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 +2 more
openaire +1 more source
Standoff Photoacoustic Spectroscopy of Explosives
Applied Spectroscopy, 2016Detection 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 +2 more
openaire +2 more sources
Applications of Resonant Photoacoustic Spectroscopy
Second International Meeting on Photoacoustic Spectroscopy, 1981The 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
openaire +1 more source
Development of photoacoustic spectroscopy with a piezofilm
Applied Optics, 2007We 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
openaire +2 more sources
Photoacoustic Spectroscopy — Photoacoustic and Photothermal Effects
1990Definition. 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
openaire +1 more source
Photoacoustic spectroscopy for process analysis
Analytical and Bioanalytical Chemistry, 2005Photoacoustic 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 ...
openaire +2 more sources
Photoacoustic Spectroscopy of Biological Materials
Science, 1973A 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.
openaire +2 more sources
Proceedings of the 10th international conference on photoacoustic and photothermal phenomena, 1999
D. Debowska +6 more
openaire +1 more source
D. Debowska +6 more
openaire +1 more source