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 25 for “"Tuning Fork"”.
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Design and analysis of a micromechanical tuning fork gyroscope
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1989.
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A simple force feedback accelerometer/seismometer based on a tuning fork displacement sensor
… research into the use of a piezoelectric tuning fork as the displacement sensor in a simple force feedback seismometer. The research also includes the use of a second piezoelectric transducer as both the suspension system and the force transducer for the seismometer. A simple inertial …
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Effects of impact and vibration on the performance of a micromachined tuning fork gyroscope
Thesis (S.B. and S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1999.
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The Use of a Tuning Fork and Stethoscope Versus Clinical Fracture Testing in Assessing Possible Fractures
… a positive symptom of a possible fracture. The tuning fork and stethoscope method relied purely on a subjective assessment from the examiner. The purpose of the study was to determine if the use of a 128Hz tuning fork and stethoscope were effective evaluation tools in the assessment of possible …
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Design of non-serial, non-parallel flexural transmissions as applied to a micro-machined MEMS tuning fork gyroscope
… micro-electromechanical system (MEMS) tuning fork gyroscope (TFG) that may be used for inertial navigation, automobile rollover detection, video games, and smartphones. These design rules build upon Freedom Actuation and Constraint Topologies (FACT), pseudo-rigid body modeling (PRBM), …
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Design and analysis of a monolithic flexure atomic force microscope
… at Charlotte (UNCC). The microscope uses a tuning fork sensor to gauge its proximity to the sample surface. The sensor is fixed to a stage that is guided to move in one degree of freedom by a monolithic flexure. A piezoelectric actuator drives the moving stage while three capacitance sensors …
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Quasiparticle beam profile measurements in superfluid helium 3 - B
… a quasiparticle camera which consists of 25 tuning forks. The vibrating wire resonator is found to have a very thinly spread beam at velocities slightly higher than the pair-breaking critical velocity which spreads out at higher velocities. At 21 mm/s the vibrating resonator is found to have …
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Characterisation of thick liquids using a vibrating transducer
… of this thesis project, which is to develop a tuning fork into a portable instrument used for the characterisation of thick liquids based on their density and viscosity.
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Fluid effects in vibrating micromachined structure
… fluid damping and surfboarding effects for the tuning fork gyroscope. The quality factors in the drive and sense axes will be evaluated and compared with the experimental results for a range of pressures. The effects of the holes and the proof mass thickness (chimney) will be derived and …
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CRYOGENIC ATOMIC FORCE MICROSCOPE FOR CHARACTERIZATION OF NANOSTRUCTURES
… DC current through nanostructures. We use quartz tuning fork (QTF) as the force sensor. Unique coarse z motor design provides reliable autoapporach in the Z direction. AFM imaging with 10nm horizontal and ~2 angstrom vertical resolution has been achieved. We have used this AFM in the …
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Modeling and Sensitivity Analysis for Trace Gas Sensors
… (QEPAS) sensors, which employ a quartz tuning fork (QTF) and modulated laser to detect trace gases. Existing models of QEPAS sensors employ one-way coupling from the fluid to the structure that requires prior experimental measurements of the damping of the QTF due to its motion in the …
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Extensions of quartz-enhanced photoacoustic spectroscopy
… spectroscopy was performed on these samples. A tuning fork was also characterized. Photoacoustic signals were ultimately not realized, however, plans for future work are mentioned.
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Force multiplier in a microelectromechanical silicon oscillating accelerometer
… vibrating beam accelerometer consisting of two tuning fork oscillators attached to a large proof mass. When accelerated along the input axis, the proof mass exerts a force on the oscillators, causing their natural frequencies to shift in opposing directions. Taking the difference of these …
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Critical flow velocity in super fluid 3He-B
… we studied two almost identical quartz tuning fork resonators with different vibration directions with respect to the vertical magnetic field. One vibrated along the field direction and the other vibrated in the horizontal plane. Our measurements have shown that the critical velocity for …
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A metrological atomic force microscope
… uses a piezoelectric tube scanner with a quartz tuning fork proximity sensor to image three-dimensional sample topographies. The probe position is measured with a set of capacitance sensors, aligned so as to minimize Abbe offset error, for direct measurement of probe tip displacements. A PC-based …
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Vibrating transducers for fluid measurements
… The starting point of this research was a tuning fork with flat rectangular tines, designed to trap a narrow laminar of gas which is forced to pump in and out as the tines vibrate. The increase in kinetic energy, contributed by this high velocity' gas, gives the device a relatively large …
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Vibrational methods applied to NDT testing and fluid density measurement
… NOT work were applied to the development of the tuning fork transducers investigated by Hassan into commercial density and viscosity devices. Using narrowly spaced, large area tines a thin lamina of fluid is trapped between them. It stores a large fraction of the vibrational energy which, acting …
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Electromechanical resonators as measuring transducers
… symmetrical mechanical resonators such as the tuning fork were considered, to be the most promising. These are dynamically clamped and can be designed to have extensive regions where no vibrations occur.This enables the resonators to be robustly mounted in a way convenient for various …
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Edge-Flames and Combustion at the Microscale
… and stationary flames. A new type of ""tuning fork"" flame structure is formed in nonpremixed microburners clue to the interaction of the thermal layers formed along the heated channel walls with the mixing layer of the reactants. External heat losses cause this flame structure to …
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Neurobehavioural effects of pesticide exposure among emerging farmers in the Western Cape
… sense threshold using a 256 Hz frequency tuning fork. Exposure to OP's was derived from three metrics: (i) OP applicator status, (ii) cumulative OP exposure weighted for task/activity, (iii) diagnosed past poisoning. Two sets of analyses were conducted: a cross-sectional analysis at …
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