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ULTRASOUND TO AUDIO CONVERTER.Takessian, Alex. January 1983 (has links)
No description available.
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Ultrasonic timer systemAl Homsi, Mustafa. January 2005 (has links)
Senior Honors Thesis (Electrical and Computer Engineering)--Ohio State University, 2005. / Title from first page of PDF file. Document formatted into pages; contains 29 p.; also includes graphics (some col.). Available online via Ohio State University's Knowledge Bank.
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SPECPAK an integrated acquisition and analysis system for analyzing the echolocation signals of microchiroptera.Lindsey, Alan R. January 1991 (has links)
Thesis (M.S.)--Ohio University, June, 1991. / Title from PDF t.p.
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MICROPROCESSOR BASED SYSTEM FOR THE ULTRASONIC MEASUREMENT OF URINARY BLADDER VOLUME.Scott, Carl Alexander. January 1984 (has links)
No description available.
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Ultrasonic beam propagation in turbulent flowWeber, Francis J. January 2004 (has links)
Thesis (M.S.)--Worcester Polytechnic Institute. / Keywords: ray trace method; turbulence; ultrasonic flowmeter. Includes bibliographical references (p. 157-168).
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An exploration into bear deterrents, as related to mountain biking, and the design of an ultrasonic bear warning deviceSchmor, Mathew R. January 1999 (has links) (PDF)
Thesis (M. Env. Des.)--University of Calgary, 1999. / Includes bibliographical references (leaves 145-147).
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A micromachined ultrasonic droplet generator design, fabrication, visualization, and modeling /Meacham, John Marcus. January 2006 (has links)
Thesis (Ph. D.)--Mechanical Engineering, Georgia Institute of Technology, 2007. / Mark Papania, MD, Committee Member ; Mark Allen, Committee Member ; Yves Berthelot, Committee Member ; Ari Glezer, Committee Member ; F. Levent Degertekin, Committee Chair ; Andrei G. Fedorov, Committee Chair.
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The application of ablative laser ultrasonics to an aluminum plate, titanium tube, and welded jointsButler, Chad L. 04 June 1996 (has links)
Laser ultrasonics can be used to nondestructively evaluate structures to determine the existence and location of surface and interior flaws. The goal of this research was to determine if laser ultrasonic techniques can be applied to the inspection of aluminum plate. titanium tubes, and large welded plate structures. The research was carried out with a Q-switched pulsed ruby laser emitting light of 694 nm wavelength. Ultrasonic waves were experimentally generated and recorded in the aluminum plate and the titanium tube. A comprehensive literature study was completed to determine if the technique can be applied to welded structures. For the two experimental cases, the ultrasonic waves were received by a piezoelectric pinducer which was located on the opposite side of the plate. and on the outside of the tube. A digital oscilloscope captured the signals from the pinducer. The signals were then analyzed to determine echo spacing and frequency content. The physical characteristics of the laser pulse such as the energy and full-width-half-height and amplitudes were measured via a photodiode system and a calorimeter. The aluminum plate confirmed that the system was functioning properly, as the ultrasonic echoes that were generated matched the expected results from previous experimentation. The titanium tube data turned out to be difficult to interpret due to the complex geometry and mode conversion. The welding research showed that ultrasound can be used to identify many types of flaws in a welded joint. Currently, few researchers have applied the laser based ultrasound to flaw detection in finished welds, although several have looked at using the laser ultrasound as an input to a control system for a weld in progress. The literature research uncovered the need for further studies on the application of laser based ultrasound to flaw detection in completed welds. / Graduation date: 1997
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Design of a clamp-on ultrasonic flow meter for wet gas pipelinesVedapuri, Damodaran. January 2001 (has links)
Thesis (Ph. D.)--Ohio University, June, 2001. / Title from PDF t.p. Includes bibliographical references (leaves 191-193).
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Ultrasonic Beam Propagation in Turbulent FlowWeber, Francis J 19 April 2004 (has links)
This study was conducted to examine the effect of flow turbulence on sound waves propagating across a velocity field. The resulting information can be used to determine the potential for increasing the accuracy of an ultrasonic flowmeter, and understand the data scatter typically seen when using an ultrasonic flowmeter. A modification of the Ray Trace Method was employed which enabled the use of multiple rays in a very fine grid through a flow field. This technique allowed for the computation of the statistical variation of the propagation times for sound pulses traversing a flow field. The statistical variation was studied using two flow fields: 1) a uniform flow field with a superimposed vortex street and 2) an experimentally measured channel flow. The uniform flow field with a superimposed vortex street allowed for the examination of the effects of a large-scale flow structure on sound wave propagation, and for the verification of the analysis technique. Next by using the measured turbulent channel flow, as an example, the statistical variation of sound pulse propagation time was computed for flow likely to be encountered in actual flow measurement situations. Analysis was also conducted to determine the maximum allowable repetition rate of measurements with regard to the optimal time of flight measurements. Both the propagation time of a sound pulse moving across a uniform flow field with superimposed vortex street, and the resultant computed flow were observed to vary at the same frequency of the vortex street. Further, the magnitude of the variations was proportional with the strength of the individual vortices in the vortex street. A sound pulse propagating back and forth across a measured turbulent channel flow, afforded individual time difference variation from the mean propagation time of up to 5%. It was shown that a minimum variation occurred when the sound pulses were transmitted at a 75 degree angle to the flow axis. It was also determined that the average speed of sound in a flow field affected the final flow measurements by decreasing the measured delta time difference between the upstream and downstream propagating sound waves, and therefore the measured flow. The width of the sound path also contributed to decreasing the variation of the individual measurements by integrating over a larger sound path. These findings suggest that turbulence in a flow field affects ultrasonic flowmeter measurements by creating differences in the propagation times of individual sound pulses. Thus, turbulence and large-scale flow structures can result in variations in volumetric flow rate determination made by an ultrasonic flowmeter system.
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