An International Research Journal

AJP

SSN : 0971 - 3093

Vol 27, No 8&9, August-September, 2018

Special Issue of Asian Journal of Physics


dedicated to


Prof T Asakura


Asian Journal of Physics                                                                                                                Vol. 27 No 8&9, (2018), 00-00


Laser light scattering from rough glass liquid interface:
a case study of screening of adulterated diesel oils


Kai-Erik Peiponen,Boniphace Kanyathare and Benjamin Asamoah

Department of Physics and Mathematics, University of Eastern Finland, P. O. Box 111, FI-80101, Joensuu, Finland

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Light scattering is an important phenomenon in various technological applications. For the case of rough glass-liquid interface, it depends on the surface roughness and refractive index mismatch which leads to speckle pattern in the far field region, as well as wetting and variation in the local contact angle. The objective of this work was to study laser light scattering from both rough and smooth glass-liquid interfaces. This was accomplished using a modified handheld gloss meter (portable sensor) which enables recording of time-dependent backscattered laser light (TDBLL) through a software on an integrated laptop. As a feasibility study, authentic and adulterated diesel oils were considered. It is shown that, even though nonzero excess refractive index exists when diesel oils are mixed with kerosene, it has minor role in the dynamic process of liquid spreading. The spreading of liquid as well as excess refractive index depends on the intermolecular interactions which emerges in the measured signals. The different adulterated samples were ordered according to the increase in the volume of the adulterant (kerosene). Hence, the measured TDBLL signals for smooth and rough glass enables distinction between authentic and adulterated diesel oil samples.  © Anita Publications. All rights reserved.

Keywords: Light scattering,Refractive index, Backscattered laser light (TDBLL), Kerosine

Total Refs: 11

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Asian Journal of Physics                                                                                                                Vol. 27 No 8&9, (2018), 00-00


Three-dimensional correlation properties of speckles produced by

diffractal-illuminated diffusers


Makram Ibrahim1, Jun Uozumi2, *and Toshimitsu Asakura2

1National Research Institute of Astronomy and Geophysics (NRIAG), Helwan 11421 Cairo, Egypt

2Faculty of Engineering, Hokkai-Gakuen University, Sapporo, Hokkaido 064-0926, Japan

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Three-dimensional correlation properties were studied experimentally for speckled-speckle patterns produced by a rough surface on which the speckle field due to a random fractal object is incident. The speckled speckles observed in some lateral planes with different propagation distances did not exhibit a definite speckle size, having many intensity clusters with various sizes which tend to increase with an increase of the fractal dimension of the fractal object. The fractality across the lateral planes was confirmed by the existence of a power-law behavior in the intensity correlation, and was practically independent of the propagation distance. The longitudinal fractality was also revealed by finding a nearly power-law behavior in the longitudinal intensity correlation. It was shown that the longitudinal fractal dimension was larger than the lateral fractal dimension for each dimension of the fractal object, indicating an anisotropic fractality of the speckle field. © Anita Publications. All rights reserved.

Keywords: Speckled speckle, Fractal speckle, Speckle clustering, Longitudinal correlation, Correlation tail, Power law

Total Refs : 21

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Asian Journal of Physics                                                                                                                Vol. 27 No 8&9, (2018), 00-00

 

Joint transform correlation of compressed digital images


Joewono Widjaja

School of Physics, Suranaree University of Technology

Nakhon Ratchasima, 30000, Thailand

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Joint transform correlator (JTC) of digitally compressed images is studied by using low-contrast retinal fundus images. Simulation results show that the JTC has reliable recognition performance even though the compressed retinal images have low contrast and are corrupted by noise. © Anita Publications. All rights reserved.

Keywords: Joint transform correlator (JTC)

Total Refs : 9

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© ANITA PUBLICATIONS

All rights reserved