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On Optimization and Read-out Resolution of the Zero Power Sensor

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Viikari, Ville
dc.contributor.author Song, Jinsong
dc.date.accessioned 2012-12-07T09:34:13Z
dc.date.available 2012-12-07T09:34:13Z
dc.date.issued 2012
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/6128
dc.description.abstract Wireless sensors are emerging these days. In certain applications, they reduce installation complexity and maintenance costs. However, there are still limitations with the current passive wireless sensors such as a short detection distance and limited parameters to monitor. In this thesis work, we further develop a new concept called Zero Power to overcome challenges related to the state-of-art of passive wireless sensors. Zero Power sensor is claimed to exhibit a long read-out distance and being capable to monitor several quantities. The concept utilizes the intermodulation communication principle, in which the sensor rejects a signal which contains sensing information at the intermodulation frequency while illuminated by the reader device at two closely located frequencies. A wired sensor prototype is fabricated. The sensitivity of the sensor is experimentally characterized and the achievable read-out resolution, which defines the smallest detectable relative change in the sensor capacitance, is theoretically predicted for the first time. After the first prototype, the optimization theory of the sensor circuit is established. Based on the theory, the sensor circuit is optimized to achieve the best resolution. A conjugate matched antenna for the sensor is utilized to reduce the complexity of the sensor circuit and the energy consumption. An optimized sensor with an antenna is manufactured. The sensitivity of the optimized sensor is experimentally characterized and the achievable read-out resolution of the optimized sensor is estimated. Finally, a wireless ECG (Electrocardiography) measurement is demonstrated with the optimized sensor. According to the experimental results, the sensor can offer 1 % relative resolution (1 % change in the sensor capacitance can be detected) at 13 m distance. en
dc.format.extent [8] + 59 s.
dc.format.mimetype application/pdf
dc.language.iso en en
dc.title On Optimization and Read-out Resolution of the Zero Power Sensor en
dc.type G2 Pro gradu, diplomityö fi
dc.contributor.school Sähkötekniikan korkeakoulu fi
dc.contributor.department Radiotieteen ja -tekniikan laitos fi
dc.subject.keyword conjugate matching en
dc.subject.keyword intermodulation response en
dc.subject.keyword mixers en
dc.subject.keyword RFID en
dc.subject.keyword read-out resolution en
dc.subject.keyword sensitivity en
dc.subject.keyword wireless sensor en
dc.identifier.urn URN:NBN:fi:aalto-201212083432
dc.type.dcmitype text en
dc.programme.major Radiotekniikka fi
dc.programme.mcode S-26
dc.type.ontasot Diplomityö fi
dc.type.ontasot Master's thesis en
dc.contributor.supervisor Räisänen, Antti
dc.location P1 fi
local.aalto.openaccess yes
local.aalto.digifolder Aalto_05064
dc.rights.accesslevel openAccess
local.aalto.idinssi 45430
dc.type.publication masterThesis
dc.type.okm G2 Pro gradu, diplomityö

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