Characterization of the Asphaltene Onset Region by Focused-Beam Laser Reflectance: A Tool for Additives Screening†

ABSTRACTStructural and electrical characterization of laser recrystallized LPCVD silicon films on amorphous substrates using a shaped cw laser beam have been performed. In comparing the results to data obtained using a circular beam, it was found that a significant increase in grain size can be achieved and that the surface morphology of the shaped beam recrystallized material was much smoother. It was also found that whereas circular beam recrystallized material has a random grain structure, shaped beam material is highly oriented with a <100> texture. Finally the electrical characteristics of the recrystallized film were very good when measured in directions parallel to the grain boundaries.

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Characterization of ice recrystallization in ice cream during storage using the focused beam reflectance measurement

Journal of Food Engineering ◽

10.1016/j.jfoodeng.2014.09.014 ◽

2015 ◽

Vol 148 ◽

pp. 24-34 ◽

Cited By ~ 31

Author(s):

Fatou Toutie Ndoye ◽

Graciela Alvarez

Keyword(s):

Ice Cream ◽

Reflectance Measurement ◽

Ice Recrystallization ◽

Focused Beam

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Extensive Experimental Study on Diaphragm-Based Piezoelectric Microphone

10.1115/imece1999-0269 ◽

1999 ◽

Author(s):

Meng-Nian Niu ◽

Hong Zeng ◽

Hai Yan ◽

Eun Sok Kim

Keyword(s):

Residual Stress ◽

Experimental Study ◽

Acoustic Pressure ◽

Structural Integrity ◽

Vertical Displacement ◽

Active Area ◽

Zno Film ◽

Beam Laser ◽

Acoustic Chamber ◽

Focused Beam

Abstract This paper reports our extensive experimental study on diaphragm-based piezoelectric microphones fabricated on a silicon substrate. We have fabricated and carefully analyzed about 60 micromachined piezoelectric microphones (composed of piezoelectric ZnO film, insulating layers and electrodes) built on a low-stress silicon nitride diaphragm (with and without corrugation on the diaphragm and with five kinds of residual stress in the diaphragm). Microphone sensitivity is measured in an acoustic chamber with a B&K4135 microphone. Vertical displacement of a microphone diaphragm under an applied acoustic pressure is measured with a focused-beam laser Doppler displacement meter. Our results show that (1) corrugation releases both tensile stress and compressive stress effectively, and increases the center displacement greatly, (2) a good bending curvature in the active area is needed for a good microphone sensitivity, and (3) ZnO structural integrity is the major factor that affects the bending curvature in the active area.

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Characteristics of Instrumental Methods to Describe and Assess the Recrystallization Process in Ice Cream Systems

Foods ◽

10.3390/foods8040117 ◽

2019 ◽

Vol 8 (4) ◽

pp. 117 ◽

Cited By ~ 2

Author(s):

Anna Kamińska-Dwórznicka ◽

Ewa Gondek ◽

Sylwia Łaba ◽

Ewa Jakubczyk ◽

Katarzyna Samborska

Keyword(s):

Ice Cream ◽

Recrystallization Process ◽

Micro Ct ◽

Reflectance Measurement ◽

X Ray ◽

Different Types ◽

Types Of Information ◽

Instrumental Methods ◽

Focused Beam

Methods of testing and describing the recrystallization process in ice cream systems were characterized. The scope of this study included a description of the recrystallization process and a description and comparison of the following methods: microscopy and image analysis, focused beam reflectance measurement (FBRM), oscillation thermo-rheometry (OTR), nuclear magnetic resonance (NMR), splat-cooling assay, and X-ray microtomography (micro-CT). All the methods presented were suitable for characterization of the recrystallization process, although they provide different types of information, and they should be individually matched to the characteristics of the tested product.

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Characterization of a new cobalt precursor for focused beam deposition of magnetic nanostructures

Microelectronic Engineering ◽

10.1016/j.mee.2010.12.031 ◽

2011 ◽

Vol 88 (8) ◽

pp. 1955-1958 ◽

Cited By ~ 19

Author(s):

G.C. Gazzadi ◽

J.J.L. Mulders ◽

P. Trompenaars ◽

A. Ghirri ◽

A. Rota ◽

...

Keyword(s):

Magnetic Nanostructures ◽

Focused Beam ◽

Beam Deposition

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Quantum State-Resolved Characterization of a Magnetically Focused Beam of ortho-H2O

The Journal of Physical Chemistry A ◽

10.1021/acs.jpca.9b04294 ◽

2019 ◽

Vol 123 (42) ◽

pp. 9234-9239 ◽

Cited By ~ 1

Author(s):

Jonathan Vermette ◽

Isabelle Braud ◽

Pierre-Alexandre Turgeon ◽

Gil Alexandrowicz ◽

Patrick Ayotte

Keyword(s):

Quantum State ◽

Quantum State Resolved ◽

Focused Beam

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Free-space focused-beam characterization of left-handed materials

Applied Physics Letters ◽

10.1063/1.1567454 ◽

2003 ◽

Vol 82 (15) ◽

pp. 2535-2537 ◽

Cited By ~ 73

Author(s):

Kin Li ◽

S. J. McLean ◽

R. B. Greegor ◽

C. G. Parazzoli ◽

M. H. Tanielian

Keyword(s):

Free Space ◽

Left Handed ◽

Beam Characterization ◽

Focused Beam

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Propagation of Focused and Multibeam Laser Energy in Biological Tissue

Journal of Biomechanical Engineering ◽

10.1115/1.1289993 ◽

2000 ◽

Vol 122 (5) ◽

pp. 534-540 ◽

Cited By ~ 6

Author(s):

Alex J. Fowler ◽

M. Pinar Menguc

Keyword(s):

Biological Tissue ◽

Laser Energy ◽

Laser System ◽

Scattering Coefficient ◽

Tissue Properties ◽

Energy Delivery ◽

Beam Laser ◽

Primary Determinant ◽

Focused Beam ◽

Reduced Scattering Coefficient

The results of a Monte Carlo simulation of laser beam propagation in turbid media are presented. The study was performed to determine whether using a focused beam or multiple beams instead of a single collimated beam could improve subsurface laser energy delivery in biological tissue. A parametric study was carried out to determine both the laser fluence at a target depth and the ratio of fluence at the target over surface fluence as a function of tissue properties and the mode of energy delivery. It was found that the reduced scattering coefficient was the primary determinant as to whether multibeam or focused beam delivery could be effective. A focused beam was found to be extremely effective in increasing fluence at the target if the dimensionless reduced scattering coefficient was less than 2. The delivered fluence, however, was found to be extremely sensitive to tissue properties. A five-beam laser system was found to be less effective at increasing fluence at the target than a focused beam; but the fluence delivered by a five-beam system was far less sensitive to tissue properties, thereby making accurate dosimetry more feasible. [S0148-0731(00)01205-X]

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