Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 97 for “"high speed camera"”.
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Development of High-Speed Camera Techniques for Droplet Measurement in Annular Flows
… setup employs advanced tools, including a high-speed camera, lens, teleconverter, and a selected light source, to capture high-resolution images of droplets. Calibration procedures, incorporating depth of field testing, are implemented to ensure accurate droplet size measurements. A …
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Development of High Speed High Dynamic Range Videography
High speed video has been a significant tool for unraveling the quantitative and qualitative assessment of phenomena that is too fast to readily observe. It was first used in 1852 by William Henry Fox Talbot to settle a dispute with reference to the synchronous position of a horse's hooves while …
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Characterization of aluminum powder ignition
… model. Aluminum ignition is associated with a highly accelerated burn rate and high combustion enthalpy. A new ignition model, which can adequately interpret these conditions, is needed to develop better propulsion fuels, explosives and incendiaries that use Al as an additive. This experimental …
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Dynamic response of 3D printed beams with damping layers
… are used, one with an accelerometer, one with a high speed camera and one with a piezoelectric actuator. Characterization of the 3D printed material has been made to predict results. For the results, it is possible to conclude that using softer material as damping layer reduces the beam …
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High-Frame-Rate Oil Film Interferometry
<h1><a></a></h1> <p>High-Frame-Rate Oil Film Interferometry</p> <p>Jonathan Charles White</p> <p>This thesis presents the design and implementation of a high-frame-rate oil film interferometry technique (HOFI) used to directly measure skin friction in time dependent flows. Experiments were …
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High-speed video microscopy in optical tweezers
… in tracking more than one par- ticle at high enough frame rate. Recent advances in video camera technology allow the collection of images at several kHz. However, there has been little use of high-speed cameras in optical tweezers, partly due to data management problems and affordability. …
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Complex Field Analysis of Temporal and Spatial Techniques in Digital Holographic Interferometry
… are developed. Temporal complex phasor method is highly immune to noise and allows accurate measurement of dynamic object. A series of digital holograms is recorded by a high-speed camera during the continuously illumination changing or deformation process of the tested specimen. Each digital …
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An analysis of baseball pitch data : quantifying the effect of speed, location and movement on a batter's chances of getting a hit
Advances in high-speed camera technology have made it possible to measure the trajectory of a baseball in flight. These trajectories allow for analysis of the characteristics make a pitch difficult to hit. The goal of this paper is to examine the effect of speed, location and movement on hitting …
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The wetted ramp as a useful tool to service smaller-bodied finfishes at low-head acquatic barriers
… (Catostomus commersonii) were observed, using a high speed camera, as they attempted to scale the wetted ramp. Smaller fish traveled farther and were also able to accelerate on the ramp despite entering at lower velocities. Larger fish had relatively greater head and tail amplitudes and greater …
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Penetration of Surfactant Solutions into Capillaries
… seen as a dot of light, which is detected by a high-speed camera. An investigation on the effect of the presence and type of surfactant aims to reveal the processes by which penetration occurs. Dissipation in the wedge was investigated as a source of deviation from Lucas-Washburn behaviour. …
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Developing Adiabatic Two-Phase Flow
… tubes. The flow was visualized using a high speed camera. To better (faster and more objectively) analyze the flow, a technique was developed to determine the separation distance using a statistical method known as Change Point Analysis. The distance at which the phases become separated …
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Design and optimization of a nozzle for a needle-free injection system
… of the jet velocity were recorded via a high speed camera. A 2mm long nozzle with a contoured profile consisting of a linear segment tangent to an arc segment at the nozzle exit produced an exit velocity of 45.5m/s at the end of the injection stroke. This showed almost a 19 percent …
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Dynamic study of tunable stiffness scanning microscope probe
… identification testing using sound wave and high-speed camera recordings was clone on the macro scale version to identify trends that were then verified in the micro scale predictions. The results for the micro scale device followed the trends predicted by the macro scale experimental data. …
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Characterizing the Movement of Contaminant Liquid Metal Particles when subject to Electric Pulses, within the Context of Z-pinch Fusion Reactors
… exposing a eutectic tin-bismuth mixture to high-current pulses. Particle motion was tracked and analyzed using high-speed camera footage processed with advanced techniques, including contrast limited adaptive histogram equalization (CLAHE), neutral-density filtering, and Sobel edge …
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Effect of longitudinal micro fin tube enhancement in evaporation of R410A
… a transparent visualization section which used a high-speed camera to capture flow regimes, and vertical and horizontal pressure drop test sections. The micro-finned enhancement factors were 1.14-1.85, 0.91-1.72, and 1.05-1.66 for heat fluxes of 4, 9 and 14 kW/m2 correspondingly. Calculations for …
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Dynamic Pile-Soil Interaction in Laterally Spreading Slopes
… transducers, and digital imaging using a high speed camera. Using these images, transient profiles of slope deformation were quantitatively measured using Particle Image Velocimetry (PIV). These tests illustrate the potential for earthquake shaking to excite the natural frequency of the …
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Cavitation in Vial Drop Subjected to Mechanical Shock
… intensity was observed using a Phantom 7 high-speed camera recording. The results indicate that reducing the potential energy transmitted from the dropped vial to the solution cause the solution to be less likely to cavitate, and the intensity of cavitation would significantly vary by …
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Caracterização experimental do escoamento bifásico horizontal de fluidos reofluidificantes
… length and aeration level where measured with a high speed camera through Shadow Sizer technic. The velocity field of the liquid phase was measured using Particle Image Velocimetry (PIV). The fluids rheological properties where quantified using a rotational rheometer in the beginning and at the …
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An experimental investigation of pressure of a simple dam break generated wave impacting a plate
… sensor to determine the force on a paddle and a high-speed camera to determine the contact area. It was found that wave pressure increases as the initial height increases. The pressures ranged from 5+/-2kPa at 25+/-1cm initial water height and 12+/-2kPa at 45+/-1cm initial water height. In the …
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Dynamic response of glass under low-velocity impact and high strain-rate compression loading
… and Starphire and Borosilicate demonstrated the highest total energy absorption. High strain-rate SHPB compression tests were carried out on cylindrical glass samples at two different strain-rates. Borosilicate shohigher compressive strength and energy absorption in comparison to the other glass …
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