Imaging Diagnostics in Thermal Spraying—SprayWatch System

2000 ◽  
Author(s):  
E. Hämäläinen ◽  
J. Vattulainen ◽  
T. Alahautala ◽  
R. Hernberg ◽  
P. Vuoristo ◽  
...  
Keyword(s):  
Particle Temperature ◽  
Quantitative Imaging ◽  
Thermal Spraying ◽  
Ccd Camera ◽  
Preliminary Test ◽  
Light Sheet ◽  
Short Exposure ◽  
Hvof Spraying ◽  
Camera System ◽  
Imaging Diagnostics

Abstract A novel technique and an instrument for on-line, quantitative imaging diagnostics and process control in thermal spraying have been developed and tested in laboratory and industrial conditions. In-flight spray particles are imaged by their natural luminosity with a short-exposure, digital CCD camera system. Particle images are processed using digital image processing techniques in a PC computer. The number of particles per frame and the spatially resolved particle velocities are calculated from the images. Spectrally resolved image information is further used to determine pyrometric two-color particle temperature. A number of different modes of data presentation have been developed. The developed instrument can be used to determine particle number, velocity and temperature distributions of individual in-flight particles from the imaged region of interest of the plume. Dividing the imaged area into smaller sections, spatial distributions of these parameters can be studied. SprayWatch system provides a technically simple, easy to operate, single imaging instrument, which can provide a visual overview of the spray plume in combination with quantitative evaluation of the most important spray particle parameters. In this paper examples of using the monitoring system with plasma and HVOF spraying are presented. Preliminary test results of using a semiconductor laser generated light sheet to detect cold particles is also demonstrated.

scholarly journals Visible AO Observations at Halpha for Accreting Young Planets

2013 ◽  
Vol 8 (S299) ◽  
pp. 32-33
Author(s):  
L.M. Close ◽  
K. Follette ◽  
J.R. Males ◽  
K. Morzinski ◽  
T.J. Rodigas ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Binary Stars ◽  
Optical Resolution ◽  
Ccd Camera ◽  
Short Exposure ◽  
Low Mass ◽  
Orion Trapezium ◽  
First Time ◽  
Adaptive Optics System ◽  
Very High

AbstractWe utilized the new high-order (250-378 mode) Magellan Adaptive Optics system (MagAO) to obtain very high-resolution science in the visible with MagAO's VisAO CCD camera. In the good-median seeing conditions of Magellan (0.5–0.7″) we find MagAO delivers individual short exposure images as good as 19 mas optical resolution. Due to telescope vibrations, long exposure (60s) r' (0.63μm) images are slightly coarser at FWHM = 23-29 mas (Strehl ~ 28%) with bright (R < 9 mag) guide stars. These are the highest resolution filled-aperture images published to date. Images of the young (~ 1 Myr) Orion Trapezium θ1 Ori A, B, and C cluster members were obtained with VisAO. In particular, the 32 mas binary θ1 Ori C1C2 was easily resolved in non-interferometric images for the first time. Relative positions of the bright trapezium binary stars were measured with ~ 0.6–5 mas accuracy. In the second commissioning run we were able to correct 378 modes and achieved good contrasts (Strehl>20% on young transition disks at Hα). We discuss the contrasts achieved at Hα and the possibility of detecting low mass (~ 1–5 Mjup) planets (past 5AU) with our new SAPPHIRES survey with MagAO at Hα.

scholarly journals Quantitative imaging of cell dynamics in mouse embryos using light-sheet microscopy

2014 ◽  
Vol 127 (23) ◽  
pp. e1-e1
Author(s):  
R. S. Udan ◽  
V. G. Piazza ◽  
C.-w. Hsu ◽  
A.-K. Hadjantonakis ◽  
M. E. Dickinson
Keyword(s):  
Quantitative Imaging ◽  
Light Sheet ◽  
Mouse Embryos ◽  
Cell Dynamics ◽  
Light Sheet Microscopy

Optical Analysis of Pulse Combustion Using Shadowgraph and Planar CH-LIF Imaging Technique

2000 ◽  
Vol 123 (1) ◽  
pp. 59-63 ◽  
Author(s):  
Yojiro Ishino ◽  
Tatsuya Hasegawa ◽  
Shigeki Yamaguchi ◽  
Norio Ohiwa
Keyword(s):  
Large Scale ◽  
Ccd Camera ◽  
Pulsation Period ◽  
Planar Imaging ◽  
Camera System ◽  
Band Emission ◽  
Pulse Combustor ◽  
Pulse Combustion ◽  
Combustion Processes ◽  
Ch Radical

Planar imaging of laser-induced fluorescence of CH radical is made to examine combustion processes in a valveless pulse combustor. An excimer-pumped dye laser tuned to a wavelength of 387 nm is used to excite the R1N″=6 line of (0,0) band of the B2Σ−−X2Π system of CH radical, and an image-intensified CCD camera system is used to detect the (0,1) band emission at around 435 nm. According to the CH-LIF images, it is found that the progress in combustion during a pulsation period is expressed by the enlargement and breakup of the earlobe-shaped flame front along the outline of a pair of large-scale eddies of fresh mixture.

Production and Characterization of HVOF Sprayed NiCr-TiC Coatings Using SHS Powder Feedstock

2000 ◽  
Author(s):  
M.T. Blatchford ◽  
A.J. Horlock ◽  
D.G. McCartney ◽  
P.H. Shipway ◽  
J.V. Wood
Keyword(s):  
Thermal Spraying ◽  
Xrd Analysis ◽  
Powder Size ◽  
Coating Properties ◽  
X Ray Diffraction ◽  
Hvof Spraying ◽  
X Ray ◽  
Wear Rates ◽  
Powder Feedstock

Abstract In this paper, the production of NiCr-TiC powder by SHS, suitable for HVOF spraying, is discussed together with results on the microstructure and coating properties. Compacts for SHS were prepared by mixing elemental Ti and C with pre-alloyed Ni-20wt.% Cr powder to give an overall composition of 35wt.% NiCr and 65wt.% TiC. These were then ignited and a self-sustaining reaction proceeded to completion. Reacted compacts were crushed, sieved, and classified to give feedstock powders in size ranges of 10-45 µm and 45-75 µm. All powder was characterized prior to spraying based on particle size distribution, x-ray diffraction (XRD), and scanning electron microscopy (SEM/EDS). Thermal spraying was performed using both H2 and C3H6 as fuel gases in a UTP/Miller Thermal HVOF system. The resulting coatings were characterized by SEM and XRD analysis, and the microstructures correlated with powder size and spray conditions. Abrasive wear was determined by a modified 'dry sand rubber wheel' (DSRW) test and wear rates were measured. It has been found that wear rates comparable to those of HVOF sprayed WC-17wt% Co coatings can be achieved.

Linear CCD camera System for industry measurement and its noise evaluation

2016 ◽  
Vol 24 (10) ◽  
pp. 2532-2539 ◽  
Author(s):  
张 晨 ZHANG Chen ◽  
孙世磊 SUN Shi-lei ◽  
石文轩 SHI Wen-xuan ◽  
王 峰 WANG Feng ◽  
邓德祥 DENG De-xiang
Keyword(s):  
Ccd Camera ◽  
Camera System ◽  
Linear Ccd ◽  
Noise Evaluation

Development of Near-Diffraction Limited, Low-Cost and High-Resolution CCD Camera System for Imaging Coulter Orifices

2014 ◽  
Vol 4 (2) ◽  
pp. 54-61
Author(s):  
Sami D. Alaruri
Keyword(s):  
Imaging System ◽  
Low Cost ◽  
Ccd Camera ◽  
Image Plane ◽  
Geometric Optic ◽  
Optical Path Difference ◽  
Path Difference ◽  
Modulation Transfer ◽  
Camera System ◽  
Micro Lens

A low-cost CCD camera system for imaging Coulter orifices ranging in diameter between 20 µm and 2 mm has been developed and tested. The imaging system incorporates a 6X magnifying lens for viewing the required range of Coulter orifices and LEDs (Light emitting diodes) lamp for back illuminating the orifices. Geometric optic calculations using Zemax® for the micro-lens interfaced with the camera suggest that the spot diameter and the MTF spatial frequency at field of view equal to 0 ° and at the image plane are 5.13 µm and 271.6 lines/mm (at contrast= 37.6%), respectively. Images captured with the camera system for 20 µm, 100 µm and 2 mm diameter orifices are provided. Furthermore, a discussion for the camera micro-lens modulation transfer function, spot diagram, root-mean-square wavefront error versus field and optical path difference plots is given.

scholarly journals The simulated spectrum of the OGRE X-ray EM-CCD camera system

2017 ◽  
Vol 12 (12) ◽  
pp. C12020-C12020
Author(s):  
M. Lewis ◽  
M. Soman ◽  
A. Holland ◽  
D. Lumb ◽  
J. Tutt ◽  
...  
Keyword(s):  
Ccd Camera ◽  
Simulated Spectrum ◽  
Camera System ◽  
X Ray

A CCD camera system at Capilla Peak Observatory, New Mexico

1988 ◽  
Vol 100 ◽  
pp. 131 ◽  
Author(s):  
Bryan E. Laubscher ◽  
Stephen Gregory ◽  
Thomas J. Bauer ◽  
Michael Zeilik ◽  
Jack Burns
Keyword(s):  
New Mexico ◽  
Ccd Camera ◽  
Camera System ◽  
Peak Observatory

scholarly journals Using CCD’s in Introductory-Level College Astronomy Laboratories

1990 ◽  
Vol 105 ◽  
pp. 142-144
Author(s):  
Thomas J. Balonek
Keyword(s):  
Dark Current ◽  
Software Package ◽  
Multiple Access ◽  
Ccd Camera ◽  
Analysis Software ◽  
Camera System ◽  
Black And White ◽  
Standard Data ◽  
College Astronomy ◽  
Cooled Ccd

Our university recently purchased a liquid-nitrogen-cooled CCD camera system (from Photometrics Ltd., Tucson, Arizona) which has been installed on our campus’ 40-cm multiple access (Cassegrain/Newtonian) telescope. Images are reduced online at the observatory using Photometrics’ microcomputer-based analysis software package, which includes operations for standard data acquisition and initial stages of data reduction — including corrections for bias, dark current, and flat fielding. Images are displayed on a 256-level-gray-scale black and white monitor. Additional post-processing can be done either on the CCD system’s computer at the observatory or on IBM-AT/PC’s located both at the observatory and in the laboratory.

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