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Remotely-powered wireless monitoring...

DeHennis, Andrew David.

Remotely-powered wireless monitoring systems.

紀錄類型:	書目-電子資源 : 單行本
正題名/作者:	Remotely-powered wireless monitoring systems./
作者:	DeHennis, Andrew David.
面頁冊數:	124 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-06, Section: B, page: 3063.
Contained By:	Dissertation Abstracts International65-06B.
標題:	Engineering, Electronics and Electrical. -
電子資源:	Download fulltext (下載全文)
ISBN:	0496853082

Remotely-powered wireless monitoring systems.
DeHennis, Andrew David.

Remotely-powered wireless monitoring systems. - 124 p.

Source: Dissertation Abstracts International, Volume: 65-06, Section: B, page: 3063.

Thesis (Ph.D.)--University of Michigan, 2004.

This thesis presents work on the theory, implementation, and characterization of passive-telemetry-based wireless systems realized for both biomedical and environmental monitoring. These systems utilize a loosely-coupled transformer to enable sensing systems that provide remote readout of temperature, absolute pressure, and relative humidity. The fundamental limits in device size, wireless range, and sensor resolution have been explored for both passive and active systems. High performance passive telemetry systems have been developed to realize systems that employ the methodology developed in exploring the fundamental limitations of this technology.

ISBN: 0496853082Subjects--Topical Terms:

170927
Engineering, Electronics and Electrical.

Remotely-powered wireless monitoring systems.
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502 $a Thesis (Ph.D.)--University of Michigan, 2004.
520 $a This thesis presents work on the theory, implementation, and characterization of passive-telemetry-based wireless systems realized for both biomedical and environmental monitoring. These systems utilize a loosely-coupled transformer to enable sensing systems that provide remote readout of temperature, absolute pressure, and relative humidity. The fundamental limits in device size, wireless range, and sensor resolution have been explored for both passive and active systems. High performance passive telemetry systems have been developed to realize systems that employ the methodology developed in exploring the fundamental limitations of this technology.
520 $a A fully passive device has been developed implementing resonant-frequency-shifting passive telemetry in a wireless pressure sensor. The wireless sensor has been realized as a double-sided single-chip device that utilizes a bulk-micromachined capacitive pressure transducer and an on-chip spiral antenna. The device is designed for intracranial pressure monitoring and measures 6mm x 6mm x 0.5mm with a resonant frequency of 12MHz. The pressure sensor is fabricated using a dissolved-wafer silicon-on-glass process. This system implements low-impedance, front-to-back interconnect for the glass die as well as high-Q on-chip inductors. The device has been utilized for signal readout with coupling distances approaching 4cm. Tradeoffs between resolution and coupling range limit the coupling distance to 8mm for a 1mmHg pressure resolution.
520 $a This thesis work has also developed hybrid and integrated versions of passive-telemetry systems that implement backscatter modulation to transmit sensor information to the interrogator systems. The hybrid system is implemented using a single chip transducer front-end that monolithically integrates transducers for temperature, pressure, and relative humidity in a silicon-on-glass process. This process combines anodic bonding and a silicon-gold eutectic to realize vacuum-sealed cavities with low-impedance (6O) electrical feedthroughs. Temperature is sensed capacitively using a row of Si/Au bimorph beams that produce a sensitivity of 15fF/�C from 20 to 100�C. The absolute pressure sensors have a sensitivity of 15fF/Torr and a range from 500 to 1200Torr, and the relative humidity sensor responds with 39fF/%RH from 20--95%RH. A relaxation oscillator implements low-power capacitance-to-frequency conversion on a second chip with a sensitivity of 750Hz/pF at 15kHz, forming a 341muW transducer interface. (Abstract shortened by UMI.)
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