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- Creators: Bakkaloglu, Bertan
- Creators: Barnaby, Hugh
Description
The belt component of a unique and novel wireless spinal cord stimulator (SCS) system was conceived, designed, made, and verified. This thesis details and documents all work from inception through preliminary verification and includes recommendations for future work. The purpose, scope, and objectives of the design and the thesis are introduced. Background literature is presented to provide context for the wireless SCS system as well as the belt component of the system. The product development process used to design the product is outlined. Requirements and constraints are determined from customer needs. Design options are considered and the best concept is selected. The design is made, optimized, and verified to meet the requirements. Future work for this design, outside the scope of this thesis, is discussed. Recommendations and conclusions following completion of the design are included as well.
ContributorsSimeunovic, Andrej (Author) / Zhu, Haolin (Thesis director) / Bakkaloglu, Bertan (Committee member) / Barrett, The Honors College (Contributor) / Mechanical and Aerospace Engineering Program (Contributor)
Created2014-05
Description
The RADiation sensitive Field Effect Transistor (RADFET) has been conventionally used to measure radiation dose levels. These dose sensors are calibrated in such a way that a shift in threshold voltage, due to a build-up of oxide-trapped charge, can be used to estimate the radiation dose. In order to estimate the radiation dose level using RADFET, a wired readout circuit is necessary. Using the same principle of oxide-trapped charge build-up, but by monitoring the change in capacitance instead of threshold voltage, a wireless dose sensor can be developed. This RADiation sensitive CAPacitor (RADCAP) mounted on a resonant patch antenna can then become a wireless dose sensor. From the resonant frequency, the capacitance can be extracted which can be mapped back to estimate the radiation dose level. The capacitor acts as both radiation dose sensor and resonator element in the passive antenna loop. Since the MOS capacitor is used in passive state, characterizing various parameters that affect the radiation sensitivity is essential. Oxide processing technique, choice of insulator material, and thickness of the insulator, critically affect the dose response of the sensor. A thicker oxide improves the radiation sensitivity but reduces the dynamic range of dose levels for which the sensor can be used. The oxide processing scheme primarily determines the interface trap charge and oxide-trapped charge development; controlling this parameter is critical to building a better dose sensor.
ContributorsSrinivasan Gopalan, Madusudanan (Author) / Barnaby, Hugh (Thesis advisor) / Holbert, Keith E. (Committee member) / Yu, Hongyu (Committee member) / Arizona State University (Publisher)
Created2010