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.

scholarly journals Characterization of Pharmaceutical Tablets Using UV Hyperspectral Imaging as a Rapid Line to Line Analysis Tool

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4436
Author(s):  
Mohammad Al Ktash ◽  
Mona Stefanakis ◽  
Barbara Boldrini ◽  
Edwin Ostertag ◽  
Marc Brecht
Keyword(s):  
Hyperspectral Imaging ◽  
Large Scale ◽  
Solid Phase ◽  
Ultra Violet ◽  
Principal Component ◽  
Ccd Camera ◽  
Conveyor Belt ◽  
Hyperspectral Data ◽  
Analysis Tool ◽  
Sample Set

A laboratory prototype for hyperspectral imaging in ultra-violet (UV) region from 225 to 400 nm was developed and used to rapidly characterize active pharmaceutical ingredients (API) in tablets. The APIs are ibuprofen (IBU), acetylsalicylic acid (ASA) and paracetamol (PAR). Two sample sets were used for a comparison purpose. Sample set one comprises tablets of 100% API and sample set two consists of commercially available painkiller tablets. Reference measurements were performed on the pure APIs in liquid solutions (transmission) and in solid phase (reflection) using a commercial UV spectrometer. The spectroscopic part of the prototype is based on a pushbroom imager that contains a spectrograph and charge-coupled device (CCD) camera. The tablets were scanned on a conveyor belt that is positioned inside a tunnel made of polytetrafluoroethylene (PTFE) in order to increase the homogeneity of illumination at the sample position. Principal component analysis (PCA) was used to differentiate the hyperspectral data of the drug samples. The first two PCs are sufficient to completely separate all samples. The rugged design of the prototype opens new possibilities for further development of this technique towards real large-scale application.

Towards A Multi-FPGA Infrared Simulator

2007 ◽  
Vol 4 (4) ◽  
pp. 343-355 ◽  
Author(s):  
Vinay Sriram ◽  
David Kearney
Keyword(s):  
Homeland Security ◽  
Reconfigurable Computing ◽  
High Speed ◽  
High Performance ◽  
Large Scale ◽  
Computation Time ◽  
Ccd Camera ◽  
Hardware Acceleration ◽  
Limiting Factor ◽  
Scene Simulation

High speed infrared (IR) scene simulation is used extensively in defense and homeland security to test sensitivity of IR cameras and accuracy of IR threat detection and tracking algorithms used commonly in IR missile approach warning systems (MAWS). A typical MAWS requires an input scene rate of over 100 scenes/second. Infrared scene simulations typically take 32 minutes to simulate a single IR scene that accounts for effects of atmospheric turbulence, refraction, optical blurring and charge-coupled device (CCD) camera electronic noise on a Pentium 4 (2.8GHz) dual core processor [7]. Thus, in IR scene simulation, the processing power of modern computers is a limiting factor. In this paper we report our research to accelerate IR scene simulation using high performance reconfigurable computing. We constructed a multi Field Programmable Gate Array (FPGA) hardware acceleration platform and accelerated a key computationally intensive IR algorithm over the hardware acceleration platform. We were successful in reducing the computation time of IR scene simulation by over 36%. This research acts as a unique case study for accelerating large scale defense simulations using a high performance multi-FPGA reconfigurable computer.

Immersive Visualization of Virtual 3D City Models and its Applications in E-Planning

2012 ◽  
Vol 1 (4) ◽  
pp. 17-34 ◽  
Author(s):  
Juri Engel ◽  
Jürgen Döllner
Keyword(s):  
Large Scale ◽  
Spatial Information ◽  
Immersive Environments ◽  
Camera System ◽  
Visualization System ◽  
3D City Models ◽  
3D Rendering ◽  
Planning Models ◽  
Immersive Visualization ◽  
City Models

Immersive visualization offers an intuitive access to and an effective way of realizing, exploring, and analyzing virtual 3D city models, which are essential tools for effective communication and management of complex urban spatial information in e-planning. In particular, immersive visualization allows for simulating planning scenarios and to receive a close-to-reality impression by both non-expert and expert stakeholders. This contribution is concerned with the main requirements and technical concepts of a system for visualizing virtual 3D city models in large-scale, fully immersive environments. It allows stakeholders ranging from citizens to decision-makers to explore and examine the virtual 3D city model and embedded planning models “in situ.” Fully immersive environments involve a number of specific requirements for both hardware and 3D rendering including enhanced 3D rendering techniques, an immersion-aware, autonomous, and assistive 3D camera system, and a synthetic, immersion-supporting soundscape. Based on these requirements, the authors have implemented a prototypical visualization system that the authors present in this article. The characteristics of fully immersive visualization enable a number of new applications within e-planning workflows and processes, in particular, with respect to public participation, decision support, and location marketing.

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

Further Evaporation and Final Treatment of Process-Water Concentrates

1999 ◽  
Vol 40 (11-12) ◽  
pp. 25-32
Author(s):  
Paterson McKeough ◽  
Leena Fagernäs
Keyword(s):  
Large Scale ◽  
Treatment Process ◽  
Treatment Options ◽  
Paper Mill ◽  
Pilot Scale ◽  
Forced Circulation ◽  
Final Treatment ◽  
Solids Content ◽  
Combustion Processes ◽  
Future Work

The study is part of a longer-term effort aimed at developing a separate treatment process for evaporation-concentrates of paper-mill process waters. This article deals with research on the two key processing steps; namely, the further evaporation and the final treatment of the concentrates. In laboratory experiments, various feed waters, including several different TMP filtrates, were evaporated to high dry-solids contents. The condensates recovered in most experiments contained relatively small amounts of organic matter. The extent of vapourisation of organic acids, relative to water, increased somewhat with increase in dry-solids content. Two TMP concentrates from large-scale evaporation plants were further concentrated in a pilot-scale forced-circulation evaporator. Viscosity was the factor limiting the extent of concentration. Using an evaporation temperature of about 80°C, the maximum dry-solids contents achieved with the two different concentrates were about 45 wt% and about 60 wt%, respectively. Fouling of heat-transfer surfaces was observed with both concentrates. A techno-economic evaluation of final-treatment options for alkali-rich concentrates is under way. According to intermediate results, molten-phase combustion processes would not require support fuel once the dry-solids content of TMP concentrate exceeds about 50 wt%. The aim of future work is to optimise the overall treatment process.

scholarly journals Comparison of a Deep Learning-Based Pose Estimation System to Marker-Based and Kinect Systems in Exergaming for Balance Training

Sensors ◽  
2020 ◽  
Vol 20 (23) ◽  
pp. 6940
Author(s):  
Elise Klæbo Vonstad ◽  
Xiaomeng Su ◽  
Beatrix Vereijken ◽  
Kerstin Bach ◽  
Jan Harald Nilsen
Keyword(s):  
Deep Learning ◽  
Pose Estimation ◽  
Gold Standard ◽  
Large Scale ◽  
Statistical Significance ◽  
Balance Training ◽  
Home Exercise ◽  
Rank Test ◽  
Camera System ◽  
Estimation System

Using standard digital cameras in combination with deep learning (DL) for pose estimation is promising for the in-home and independent use of exercise games (exergames). We need to investigate to what extent such DL-based systems can provide satisfying accuracy on exergame relevant measures. Our study assesses temporal variation (i.e., variability) in body segment lengths, while using a Deep Learning image processing tool (DeepLabCut, DLC) on two-dimensional (2D) video. This variability is then compared with a gold-standard, marker-based three-dimensional Motion Capturing system (3DMoCap, Qualisys AB), and a 3D RGB-depth camera system (Kinect V2, Microsoft Inc). Simultaneous data were collected from all three systems, while participants (N = 12) played a custom balance training exergame. The pose estimation DLC-model is pre-trained on a large-scale dataset (ImageNet) and optimized with context-specific pose annotated images. Wilcoxon’s signed-rank test was performed in order to assess the statistical significance of the differences in variability between systems. The results showed that the DLC method performs comparably to the Kinect and, in some segments, even to the 3DMoCap gold standard system with regard to variability. These results are promising for making exergames more accessible and easier to use, thereby increasing their availability for in-home exercise.

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
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