Results 231 to 240 of about 3,766 (264)
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Medical Physics, 1994
Differential absorption has been detected and localized in three‐dimensions by recording the photoacoustic pulses that were produced when short‐duration (∼1 μs) pulses of electromagnetic energy were absorbed regionally within a turbid medium. These absorption sites were localized with a spatial resolution of ∼6 mm within a 20×20×7.5‐cm3 volume of 0.3 ...
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Differential absorption has been detected and localized in three‐dimensions by recording the photoacoustic pulses that were produced when short‐duration (∼1 μs) pulses of electromagnetic energy were absorbed regionally within a turbid medium. These absorption sites were localized with a spatial resolution of ∼6 mm within a 20×20×7.5‐cm3 volume of 0.3 ...
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Photoacoustic Resonance Imaging
IEEE Journal of Selected Topics in Quantum Electronics, 2019In this paper, a new imaging modality, named photoacoustic resonance imaging (PARI), is proposed and experimentally demonstrated. Being distinct from conventional single nanosecond laser pulse induced wideband PA signal, the proposed PARI method utilizes multiburst modulated laser source to induce PA resonant signal with enhanced signal strength and ...
Ruochong Zhang +5 more
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Physical Review Letters, 2001
Physical Review ...
I G, Calasso, W, Craig, G J, Diebold
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Physical Review ...
I G, Calasso, W, Craig, G J, Diebold
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Photoacoustic detection of HCl
Optics Letters, 1983A sensitive photoacoustic detection system for trace atmospheric measurements of HCl is described. The results reported here suggest the capability of measuring HCl at the 50-parts-in-10(9) level with a prototype laboratory system. Further system improvements and atmospheric-measurement considerations are discussed.
A, Fried, W W, Berg
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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
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Photoacoustic spectra of MoS_2
Applied Optics, 1983The photoacoustic spectra of powdered MoS2 prepared by particle-size reduction and dilution have been determined and compared with the optical transmittance spectra of single crystals and thin-film deposits. MoS2 was chosen as a typical representative of the layer-structured transition metal dichalcogenides, for which optical properties are important ...
K D, Carlson, D, Hodul
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Photoacoustic imaging endoscope
2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2009We currently present a design concept for a photoacoustic imaging endoscope as well as some preliminary experimental results. The device is based on the generation of acoustic waves in tissue by short laser pulses and the sensing of these waves with a thin, optical Fabry-Pérot etalon.
C, Sheaff +4 more
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Multimodal Photoacoustic Tomography
IEEE Transactions on Multimedia, 2013Currently available optical microscopic imaging techniques-confocal microscopy, multi-photon (also referred to as two-photon) microscopy, and optical coherence tomography-have revolutionized biological and medical research, based on strong optical contrast and high spatial resolution.
Mansik Jeon, Chulhong Kim
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Photoacoustic Investigation of Pesticides
1989The photoacoustic effect caused by the absorption of the modulated radiation thereby leading to the generation of sound in the gas at the very same chopping frequency, has emerged as a valuable tool for a variety of applications. This is described in several excellent books and review articles on this topic [1,2,3,4,5].
Bicanic, D.D. +6 more
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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.
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