Atmospheric PSF caused by light scattering: comparison of a Monte Carlo model to experimental results

1999 ◽  
Author(s):  
Tal Carmon ◽  
Lidia Langof ◽  
Uri P. Oppenheim ◽  
Adam D. Devir
Keyword(s):  
Monte Carlo ◽  
Light Scattering ◽  
Monte Carlo Model ◽  
Experimental Results

Design of Underwater Non-Coaxial Single Beam Scanning Detecting System

2016 ◽  
Author(s):  
Yayun Tan ◽  
He Zhang
Keyword(s):  
Monte Carlo ◽  
Final Stage ◽  
Monte Carlo Model ◽  
Experimental Results ◽  
Optical Simulation ◽  
Beam Scanning ◽  
Detection Range ◽  
Single Beam ◽  
System Parameters ◽  
Underwater Laser

Aiming at the necessity of torpedo detecting near field target in final stage of guidance, a non-coaxial (transmitter and receiver are not on the same axis) single beam scanning detecting and ranging system has been designed to be applied in torpedo. To study this detection system, this paper proposes a Monte Carlo simulation method for the system. The backscattering signal and target echo signal in seawater is simulated, and then the Signal-to-Backscattering-Noise (SBNR) is calculated. Furthermore, the relationship between maximum detecting distance and system parameters is calculated based on the criterion of minimum SNBR. Finally, the optimal system parameters are determined to get maximum detection range. For verifying the correctness of the theoretical models, underwater laser detection optical simulation system is designed to do target detecting experiment in a basin. The comparative analyses of the simulation and the experimental results show that the simulation results fit the experimental data well, thus the correctness of the semi-analytical Monte Carlo model is verified. The optimal parameters in single beam scanning detecting system can be determined according to the simulation and experimental results. The designed underwater laser detecting system provides a new method for the torpedo to detect underwater target in final stage of guidance.

Benchmarking of Monte Carlo model of PWR (CNPP-II) core against theoretical and experimental results

2016 ◽  
Vol 92 ◽  
pp. 164-174 ◽  
Author(s):  
Anas Gul ◽  
R. Khan ◽  
M. Azeem ◽  
I. Shahzad ◽  
T. Stummer
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Model ◽  
Experimental Results

A Monte Carlo Model for Light Scattering by Dark Nebulae

1979 ◽  
Vol 3 (5) ◽  
pp. 312-315
Author(s):  
M. I. Darby ◽  
D. J. King ◽  
K. N. R. Taylor
Keyword(s):  
Monte Carlo ◽  
Light Scattering ◽  
Surface Brightness ◽  
Transfer Problem ◽  
Dust Cloud ◽  
Monte Carlo Model ◽  
Radiative Transfer Problem ◽  
Monte Carlo Techniques ◽  
Dust Grain ◽  
Model Approach

The Thumbprint Nebula (TPN) in Chamaeleon (first described by Fitzgerald (1974), and shown in Figure 1) is a good example of the class of dense, dark nebulae that exhibit dark cores and bright rims, and have been referred to (Lynds 1967) as ‘bright dark nebulae’. Early observations of these nebulae established that the dust grains within them were strongly forward-scattering (Struve and Elvey 1936, Struve 1937). However, the treatment of the radiative transfer problem was too inadequate to permit more than tentative conclusions regarding the nebulae. In more recent years, with the advent of modern computers, the transfer of radiation through a dust cloud has been treated more rigorously, using Monte Carlo techniques (Mattila 1970, Witt and Stephens 1974). Witt and Stephens (1974) have demonstrated that for a dense nebula the surface brightness profile is sensitive to the dust grain density distribution within the cloud and to the scattering properties of the grains. The scattering model approach can be valuable in the investigation of very opaque dark nebulae that cannot be studied by conventional star counting techniques. This has been demonstrated in the case of the TPN by Fitzgerald et al (1976), who used the Witt and Stephens model.

Light Scattering from Deformed Droplets and Droplets with Inclusions: Volume 1 - Experimental Results

2000 ◽  
Author(s):  
David R. Secker ◽  
Richard Greenaway ◽  
Paul H. Kaye ◽  
Edwin Hirst ◽  
David Bartley
Keyword(s):  
Light Scattering ◽  
Experimental Results

scholarly journals Experimental Results on Scattering by Irregular and Meteoritic Dust Particles Related to Photopolarimetry of Zodiacal Light and Comets

1985 ◽  
Vol 85 ◽  
pp. 223-226
Author(s):  
K. Weiss-Wrana ◽  
R.H. Giese ◽  
R.H. Zerull
Keyword(s):  
Light Scattering ◽  
Size Range ◽  
Experimental Results ◽  
Dust Particles ◽  
Dust Grains ◽  
Scattering Function ◽  
Negative Polarization ◽  
Zodiacal Light ◽  
Cometary Dust ◽  
Characteristic Features

AbstractThe investigations of light scattering by larger meteoritic and terrestrial single grains (size range 20 μm to 120 μm ) demonstrate that the scattering properties of irregularly shaped dark opaque particles with very rough surfaces resemble the characteristic features of the empirical scattering function as derived from measurements of the zodiacal light. Purely transparent or translucent irregularly shaped particles show a quite different scattering behaviour. Furthermore irregular and multicomponent fluffy particles in the size range of a few microns were modelled by microwave analog measurements in order to explain positive and negative polarization of the light scattered by cometary dust grains.

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