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 12 of 12 for “"optical encoder"”.
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A laser speckle based position sensing technique
… against the counts of a commercial incremental optical encoder. A custom-built bicell photointerrupter unit is used as a reference sensor for the incremental optical encoder. To test for the control performance of this speckle-based sensor, we have constructed a transmission drive to run the …
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Digital speed and position control system incorporating an Incremental encoder
… is a closed-loop real time control system, where optical encoder is coupled to the motor shaft to provide the feedback speed signal to controller. Pulse Width Modulation (PWM) technique is used where its signal is generated in microcontroller. The microcontroller will send PWM signal to motor …
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Synchronized Measurement of Machine Rotor Angle and Its Application
… the internal angle using a microprocessor and an optical encoder installed on the shaft of a generator. With a synchronized angle measurement, accurate stability studies and wide-area controls can be implemented. The experimental setup for measuring the rotor angle of a generator is explained in …
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Investigation of code reconfigurable fibre Bragg gratings for Optical Code Division Multiple Access (OCDMA) and Optical Packet Switching (OPS) Networks
… of code reconfigurable OCDMA and all-optical packet switching nodes based on fibre Bragg grating (FBG) technology. My research work involves characterizing the performance of various gratings, specifically high reflectivity, short chip duration, long code sequences, multiple phase …
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Performance and design improvements toward the commercialization of a needle-free jet injector/
… of the Lorentz-force motor, and a linear encoder provided increased position resolution. Flexible coil elements reduced drag on the coil while eliminating a mechanical failure mode caused by moving cables. A low cost optical encoder system has been implemented to provide 5 pm position …
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A personal computer based instrumentation system for determining real-time dynamic torque in rotating machinery
… of determining real-time dynamic torque. An optical encoder is used to sense motion at a convenient point in the rotating system containing the rigid shaft of interest. The encoder's output is processed digitally to yield angular velocity, acceleration and dynamic torque. Two different …
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Synchronous Sampling Sideband Orders from Helical Planetary Gear Sets
… and enhance the design process. An optical encoder, a component of the SS system, mechanically locked to the rotating system controls the A/D converter to sample at constant shaft angle increments. The phase-locked nature of SS allows the use of vector averaging to significantly …
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The impact of haptic guidance on musical motor learning
… Haptic Guidance System, uses a servo motor and optical encoder pairing to provide precise measurement and playback of motions approximating those involved in snaredrum performance. This device was used in a pilot study of the effects of physical guidance on percussion learning.
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Hybrid Induction Drive for a Magnetically Levitated Control Moment Gyroscope
… the rotor about its axis of magnetization. An optical sensor previously developed for position sensing was adapted for spin measurements at high speeds by creating an optical encoder pattern on the rotor. Speeds up to 401 RPM and a torque up to 3.0 μNm were measured, with no significant …
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Sensors and System Integration for Magnetic Resonance Image (MRI)-Guided and Robot-Assisted Interventions
… coupled radio frequency (ICRF) coils that are optically tuned and detuned by the control of an MR-compatible manipulator for accurate localization and fast tracking, (ii) a novel method for 3D reconstruction of tubular structures such as catheters and blood vessels from three orthogonal MR …
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Regulator control of a short-radius centrifuge and subjective responses to head movements in a rotating environment
… been implemented on the centrifuge with both an optical encoder and an accelerometer. Tachometer development, automatic control, and classical PID control theory was used to develop the gain and integrator time constants, which lead to K=1.5 and Ti=1 sec. This results in an improved steady state …
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Settling-Time Improvements in Positioning Machines Subject to Nonlinear Friction Using Adaptive Impulse Control
… with a position measurement resolution of 16000 encoder counts per revolution of the load wheel. The friction in the test system is nonlinear and irregular with a position dependent break-away torque that varies by a factor of more than 1.8 to 1. AIC is shown to improve settling times by as much …