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Showing 1 to 20 of 121 for “"Schlieren"”.
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Adaptive synthetic Schlieren imaging
Traditional schlieren photography has several important disadvantages when designing a system to image refractive index gradients including the relatively high cost of parabolic mirrors and the fact that the technique does not easily yield quantitative data. Both these issues are resolved by using …
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Photographic materials for interferometer, schlieren, and shadowgraph apparatus
Thesis: B.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1953
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Analysis and construction of a sharp focussing Schlieren system
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1959.
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Application of Background Oriented Schlieren (BOS) in Underground Mine Ventilation
The schlieren technique describes an optical analysis method designed to enhance light distortions caused by air movement. The ability to visualize gas flows has significant implications for analyzing underground mine ventilation systems. Currently, the widely utilized traditional schlieren methods …
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The Kinetics of Anodic Films With an Appendix on The Schlieren Microscope
Made available in DSpace on 2015-05-12T17:11:46Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0006984.PDF: 5933396 bytes, checksum: 7b116d2220e0b60eb7efa6effb010b69 (MD5) Previous issue date: 1953
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Quantification of the Depth-of-Field in a Self-Aligned Focusing Schlieren System
<p>This thesis investigates self-aligned focusing schlieren (SAFS) as a step toward future volumetric and quantitative measurements of three-dimensional compressible flows. Conventional schlieren imaging provides valuable visualization of density gradients, but it records only a line-of-sight …
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Investigation of the condensation shock in air by use of the Schlieren Method
Thesis (M.S.) Massachusetts Institute of Technology. Dept. of Naval Architecture and Marine Engineering, 1946.
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Experimental investigation of internal tide generation by two-dimensional topography using synthetic Schlieren
… topography was carried out using the synthetic Schlieren experimental technique. Two linear models were tested: Balmforth, Ierley and Young's [1] subcritical solution for a Gaussian ridge and Hurley and Keady's [15] super-critical solution for a knife-edge. The former was modified to account for …
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The development of an optically active laser Schlieren system with application to high pressure solid propellant combustion
A laser schlieren system, using an optically active single-piece quartz prism-polaroid sheet combination aperture in place of the conventional knife edge, was developed and applied to high pressure solid propellant combustion studies. Advantages and limitations of the system are discussed. Ammonium …
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Calibrating Schlieren imaging for understanding local film deformation for a range of wetting and intrusions in soap films
… by Su and Bourouiba [30] by showing that the Schlieren spot size produced by large objects is not affected by size or wetting properties of the object. The spot size in soap films is primarily affected by the film thickness, consistent with prior results on water films (without surfactant).
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Strip Film Schlieren-Interferometric Observation of the Effect of Reflected Shock-Boundary Layer Interaction on Reflected Shock Density in Several Gases
Made available in DSpace on 2014-12-09T18:12:20Z (GMT). No. of bitstreams: 1 6511775.pdf: 4880336 bytes, checksum: 148962069ae56c0ef97ba1d4085f9a6f (MD5) Previous issue date: 1965
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Coalescence of nonlinear acoustic waves, with application to supersonic jet noise
… The interacting waves are tracked using schlieren imaging to compare waveform steepening in coalescing and non-coalescing waves. High frame-rate schlieren images of sound waves propagating from the post potential core region of a laboratory-scale Mach 3 jet are captured in a narrow field …
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Anodic dissolution and electropolishing of copper in phosphoric acid
… the purely physical methods of microscopy and schlieren analysis.
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Spray characterization of flex-fuel gasoline di injectors and spray interaction with charge motion in a variable valve actuation engine
… conducted for a study of spray development. By Schlieren visualization technique, the effect of different conditions including ambient conditions (temperature, pressure) and injection conditions (fuel type, fuel temperature, nozzle design) on spray formation was discussed in both qualitative and …
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DEVELOPMENT OF KRYPTON PLANAR LASER INDUCED FLUORESCENCE METHODS FOR THE MEASUREMENT OF HYPERSONIC FLOW CONDITIONS
… as hypersonic flow conditions are achieved. Schlieren and shadowgraph imaging methods have been used successfully for decades as a method of non-intrusive flow visualization. However, these methods become obsolete when the path of light is obstructed, which is a common problem when analyzing …
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Fundamental physics and application of plasma actuators for high-speed flows
… conducted in quiescent air and analyzed with schlieren photography to determine the effectiveness of a plasma pulse to produce an instantaneous flow perturbation. Examination of phase averaged schlieren images revealed that a blast was produced by the emission and could be used to alter a flow …
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Measurement of flame propagation through step changes in mixture composition
… movement of the flame front through high speed Schlieren imaging. Both methods demonstrated good correlation with the literature for homogeneous charges. However, the analysis necessarily assumes a spherical flame, but the Schlieren video showed that the laser ignition system induced a …
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An experimental investigation of transverse jets in supersonic crossflow
… The flow field was visualized using two types of schlieren methods, meanwhile, the mean and pressure fluctuation distributions beneath the TJISC were measured by Pressure-Sensitive Paint (PSP) and a high-speed pressure transducer array, respectively. Besides the general flow features, …
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Experimental investigation of noise reduction in supersonic jets due to jet rotation and to nozzle geometry changes
… were investigated experimentally via spark Schlieren photography, static, Pitot and sound pressure measurements. Schlieren photography was employed to visualize the flow and shock structure associated with any of the above changes. Static and pitot pressure measurements were carried out to …
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