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.
Results
Showing 1 to 11 of 11 for “"Optical fiber probe"”.
-
Investigation of local velocities and phase holdups, and flow regimes and maldistribution identification in a trickle bed reactor
… validating, and implementing a new two-tip optical fiber probe technique. It was found the radially and axially the liquid and gas velocities and their saturation vary and they also vary with times. In various locations, due to non-uniform distribution of the flowing phases, there are …
-
A study of thermographic phosphor thermometry in an operating turbofan engine
… thermometry utilizing 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 …
-
Hydrodynamics of trickle bed reactors (TBRS) packed with industrial catalyst using advanced measurement techniques
… techniques of Gamma-ray densitometry (GRD) and Optical fiber probe and conventional measurement techniques of high-frequency differential pressure transducer and load cell. Two different reactor sizes of bench and pilot plant scale were used. Bench-scale TBR carried out the experiments to assess …
-
Development of an intracoronary Raman spectroscopy
… the use of a flexible, small diameter (< 2 mm) optical fiber probe to guide light to and from the arterial wall in situ. The fact that Raman scattering has inherently low signal intensity, combined with the need for a small diameter probe, makes it difficult to develop a probe with sufficient …
-
Studies of multiphase distribution and flow in bubble/ slurry bubble columns with /without internals and advanced sustainable construction materials using sophisticated measurement techniques
… using gamma-ray densitometry (GRD) and point optical fiber probe (OFP) techniques. The obtained results indicated that increasing the solids loading increased the solid holdup and decreased the liquid holdup.</p><p>However, the gamma-ray computed tomography (γ-CT) technique has been employed …
-
Impact of vertical internals on the hydrodynamics and heat transfer coefficient in a gas-solid fluidized bed
… kinds of measurement techniques such as advanced optical fiber probe for local solids and bubble hydrodynamics measurements, differential pressure transducer for pressure fluctuation measurements, advanced fast response heat transfer probe for local heat transfer coefficient measurements, …
-
Experimental investigation of local properties in two-phase fluid-flow hydrodynamics
… 0.41 to 0.65 m/s, respectively; A dual-tipped optical-fiber probe was constructed and mounted to a 3-degree-of-freedom traversing mechanism above the channel to obtain cross-sectional profiles at a distance of 23.0 cm down inside of the flow channel. A Visual Basic software program was created …
-
Fluid Dynamics And Scale-Up Of Bubble Columns With Internals
… experimentations by means of the four-point optical fiber probe as a measuring technique. In addition, the liquid phase mixing is investigated. The effects of the presence of cooling tubes, which are commonly used in industrial applications of bubble columns, are thoroughly investigated in …
-
Optical low coherence reflectometery for morphological characterization of static and dynamic systems
In this dissertation I describe and evaluate Optical Low Coherence Reflectometery (OLCR) for morphological characterization of static and dynamic scattering systems.OLCR is a white-light interferometric technique, developed in the mid-1980s to measure the amplitude and the signal loss due to …
-
Reconstruction of the Temperature Profile Along a Blackbody Optical Fiber Thermometer
<p>A blackbody optical fiber thermometer consists of an optical fiber whose sensing tip is given a metallic coating. The sensing tip of the fiber forms an isothermal cavity, and the emission from this cavity is approximately equal to the emission from a blackbody. Standard two-color optical fiber …