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 37 for “"thermographic"”.
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Thermographic imaging of electromagnetic fields.
It is recognized that a means of converting electromagnetic fields into visible images would greatly simplify the problem of designing structures to optimize their compatibility with such fields. Two needs must be met to allow such visualization. First, the fields must be transduced into a …
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Thermographic studies of tissue trauma and seating
… response to experimental parameters. The thermographic research is presented in three phases of analysis: Chapter 4, a retrospective study of thermograms based on maximum temperatures; Chapter 5 both maximum temperatures from the real-time thermograph display and automatically collected …
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Thermographic particle image velocimetry: from phosphorescence to incandescence
Thermographic PIV is a promising technique that enables simultaneous temperature and velocity imaging in flows with intentional seeded phosphor particles. This is highly attractive to researchers in fluid mechanics and combustion, as it directly visualizes the heat and mass transfer process in …
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Thermographic detection of damaged regions in fiber-reinforced composite materials
The applicability to composite materials of a particular NDI technique, vibrothermography, is studied. With this technique, specimens are excited with a high power, low frequency ultrasonic shaker while the specimen is monitored with an infrared camera. Once temperature patterns are developed, …
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A study of thermographic phosphor thermometry in an operating turbofan engine
… the temperature dependent optical properties of thermographic phosphors was evaluated for use in measuring high-pressure turbine blade metal temperatures in an operating turbofan engine test rig. Thermographic phosphors, ceramics doped with a rare earth metal, were bonded to the turbine blades. …
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Inverse Volume-of-Fluid Meshless Method for Efficient Non-Destructive Thermographic Evaluation
<p>A novel computational tool based in the Localized Radial-basis Function (RBF) Collocation (LRC) Meshless method coupled with a Volume-of-Fluid (VoF) scheme capable of accurately and efficiently solving transient multi-dimensional heat conduction problems in composite and heterogeneous media is …
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Anomaly edge effects in thermographic nondestructive testing of polymeric composite sandwich panels
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2002.
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Thermographic Assessment of the Forearm During Data Entry Tasks: A Reliability Study
Work-related musculoskeletal disorders (WMSDs) negatively impact worker's health, ability to work, and their quality of life. Non-invasive methods for assessing the physiological responses to workload may provide information on physiological markers leading to increased risk of WMSDs. The following …
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Measuring heat exchange processes at the air-water interface from thermographic image sequence analysis
In this thesis a novel technique for estimating heat transfer at the free air water interface is presented. For the first time spatially resolved heat flux and transfer velocity measurements are available with a high temporal resolution. The statistical properties of the transfer processes are …
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Evaluation of thermographic techniques for the detection of subsurface delaminations in concrete bridge substructures
… evaluation of the feasibility of using infrared thermographic techniques to detect subsurface damage in concrete. Various methods of artificial heating, required to effectively apply this technique, are presented. Four major conclusions are reached in this study. 1) Normal ambient diurnal …
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Nondestructive evaluation of reinforced concrete via infrared thermography: a feasibility study
… specimen configurations were fabricated for thermographic inspection. A number of tests were performed on a variety of concrete specimens to determine the implementation parameters of the technique. The necessity of utilizing artificial heating methods for thermal input prior to inspection …
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A method for real time evaluation of physiological stress due to ozone exposure
… in its ear temperature patterns. By using a thermographic camera, thermal contours were obtained prior to, during and after exposure to low levels of ozone (near 1.0 ppm). Results from three ozonation experiments indicated a decrease in ear temperature of up to 2°C upon ozone's introduction. …
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Ballet Pointe Shoe Discomfort: An Exploration Through the use of Real-Time Assessments while Performing en Pointe Movements
… questionnaires, a 3-D feet model apparatus and thermographic imaging in a simulated ballet laboratory. Results demonstrated the relationship of the various methods used and their contribution on examining real-time pointe shoe discomfort and pointe shoe design recommendations.
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An experimental comparison of thermal discharges to a waterway by a single jet and by a multiple port diffuser
… was measured with thermocouple probes. Third, thermographic color patterns were developed with sheets of liquid crystals, and photographed in color. The results showed that the multiple port diffuser minimized temperature gradients in the receiving stream, but resulted in greater heat storage …
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Application of digital infrared thermography for nondestructive evaluation of composite bridge components
… evaluate the applicability of digital infrared thermographic system to detect subsurface defects such as debonds and delaminations in Fiber Reinforced Polymer (FRP) bridge decks and other composite bridge components such as beams and columns wrapped with steel or FRP jacket.;This thesis …
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An experimental investigation of the flow field near liquid fuel jets injected transverse to a hot supersonic air stream
… it. The infrared photographs are produced by a Thermographic camera which senses the radiation emitted by the surfaces and internally processes these signals to produce a color isotherm image on a color television screen. The nozzle wall temperature was varied from 250°F to 900°F. For each …
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Nondestructive Evaluation of Zirconium Phosphate Bonded Silicon Nitride Radomes
… be inspected for defects prior to use. Visible, thermographic and ultrasonic nondestructive evaluation (NDE) methods have been tested with Zr-PBSN discs containing fabricated flaws likely to be present in a radome. Ultrasonic C-scanning using a 0.25" diameter, 15 MHz focused transducer with a …
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Injection of liquid fuels in supersonic airstreams
… and infrared photographs taken with a Thermographic camera. Special attention was directed at the behavior of the liquid layer that had previously been found to form near the injector. No unequivocal evidence of ignition of either fuel was found for normal injection at these conditions. …
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Assessing the Technology Used by UAVs in Data Acquisition on Construction Sites
… process. With the technology of UAVs, cameras, thermographic scanners, and laser scanners with Light Detection and Ranging (LiDAR), this research will investigate how 3D Building Information Models (BIMs) can be created for real time project management decision making. UAVs with camera and laser …
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Materials and strategies for flexible, stretchable and large area photonic devices
… and are well-suited for high precision epidermal thermographic applications.
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