Direct detection of acoustic waves by laser light diffraction and proposals of the optophone

1998 ◽  
Vol 103 (5) ◽  
pp. 2795-2795 ◽  
Author(s):  
Yoshito Sonoda
Keyword(s):  
Acoustic Waves ◽  
Laser Light ◽  
Direct Detection ◽  
Light Diffraction

Polarization hysteresis in dielectric films using light diffraction by acoustic waves

1984 ◽  
Vol 44 (5) ◽  
pp. 522-524 ◽  
Author(s):  
Alfred E. Attard ◽  
John F. Kuehls
Keyword(s):  
Acoustic Waves ◽  
Light Diffraction ◽  
Dielectric Films

Study of Cholesteric Textures in Phase Change Devices by Laser Light Diffraction

1981 ◽  
Vol 64 (9-10) ◽  
pp. 261-268 ◽  
Author(s):  
C M Waters ◽  
F C Saunders ◽  
M G Clark
Keyword(s):  
Phase Change ◽  
Laser Light ◽  
Light Diffraction

Laser-Induced Acoustic Waves for Measurement and Imaging

2000 ◽  
Author(s):  
Wen Li ◽  
Ronald A. Roy ◽  
Robin O. Cleveland ◽  
Lawrence J. Berg ◽  
Charles A. DiMarzio
Keyword(s):  
Acoustic Waves ◽  
Peak Power ◽  
Laser Light ◽  
Short Pulse ◽  
Laser Wavelength ◽  
Acoustic Imaging ◽  
Acoustic Energy ◽  
High Peak Power ◽  
First Case ◽  
Very High

Abstract A short pulse of laser light can act as a source of acoustic energy for acoustic imaging. Although there are a number of mechanisms by which the light pulse may generate sound, all require a pulse of high peak power density and short duration. In this work, we address examples where the material is highly absorbing at the laser wavelength, and the sound is generated near the surface. In these cases, there exist two different mechanisms which can convert the light to sound. The first is heating followed by expansion, and the second is generation of a plasma in the air above the surface. In the first case, sound generation occurs in the medium of interest and the energy efficiency can be very high, in the sense that no reflection losses occur. We present two applications from our own research.

Modelling the activated sludge flocculation process combining laser light diffraction particle sizing and population balance modelling (PBM)

2002 ◽  
Vol 45 (6) ◽  
pp. 41-49 ◽  
Author(s):  
I. Nopens ◽  
C.A. Biggs ◽  
B. De Clercq ◽  
R. Govoreanu ◽  
B.-M. Wilén ◽  
...  
Keyword(s):  
Experimental Data ◽  
Laser Light ◽  
Population Balance ◽  
Light Diffraction ◽  
Balance Model ◽  
Floc Size ◽  
Shear Rates ◽  
Breakage Rate ◽  
On Line ◽  
Floc Size Distributions

A technique based on laser light diffraction is shown to be successful in collecting on-line experimental data. Time series of floc size distributions (FSD) under different shear rates (G) and calcium additions were collected. The steady state mass mean diameter decreased with increasing shear rate G and increased when calcium additions exceeded 8 mg/l. A so-called population balance model (PBM) was used to describe the experimental data. This kind of model describes both aggregation and breakage through birth and death terms. A discretised PBM was used since analytical solutions of the integro-partial differential equations are non-existing. Despite the complexity of the model, only 2 parameters need to be estimated: the aggregation rate and the breakage rate. The model seems, however, to lack flexibility. Also, the description of the floc size distribution (FSD) in time is not accurate.

Convolution and correlation using light diffraction from bulk acoustic waves

1975 ◽  
Vol 11 (13) ◽  
pp. 281 ◽  
Author(s):  
J.M. Rouvaen ◽  
E. Bridoux ◽  
R. Torguet ◽  
C. Carles
Keyword(s):  
Acoustic Waves ◽  
Light Diffraction ◽  
Bulk Acoustic Waves
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