Nano Science and Technology InstituteNano Science and Technology Institute
Nano Science and Technology Institute 2005 NSTI Nanotechnology Conference & Trade Show
Nanotech 2005
Bio Nano 2005
Business & Investment
Nano Impact Workshop
Program
Sessions
Sunday
Monday
Tuesday
Wednesday
Thursday
Index of Authors
Index of Keywords
Keynote Presentations
Confirmed Speakers
Participating Companies
Industry Focus Sessions
Nanotech Expo
Special Symposia
Conferences
Sponsors
Exhibitors
Venue 2005
Organization
Press Room
Subscribe
Site Map
 
Nanotech 2005 At A Glance
Nanotech Proceedings
Nanotechnology Proceedings
Global Partner
nano tech
Supporting Organizations
Nanotech 2005 Supporting Organization
Media Sponsors
Nanotech 2005 Medias Sponsors
Event Contact
696 San Ramon Valley Blvd., Ste. 423
Danville, CA 94526
Ph: (925) 353-5004
Fx: (925) 886-8461
E-mail:
 
 

SAW Based Passive Radio Sensor using Energy Gathering Method

J-G. Oh, W.S. Kim and B. Choi
Sogang University, KR

Keywords:
SAW, passive radio sensor, energy gathering, RF

Abstract:
This paper represents the new passive radio sensors which need no external power sources and transmit sensor value to the aerial. The wireless sensors are emerging field of ubiquitous sensor network (USN) and structural health monitoring systems. Despite of the rapidly growing of wireless link technology, the power grid acts as an obstacle for USN. Our research focused on the method for the development of passive radio sensor which needs no batteries. In addition, our research focused on enhancing the passive sensor’s detection range, too. Since the FCC regulation strongly limits the transmitting power level and the operating frequency band, current SAW passive radio sensor cannot transmit sensor value over 4-5 meters long. We developed a novel SAW transponder as a transversal type with an energy gatherer for range expansion. The main operating principles are the SAW(Surface Acoustic Wave) excitation by the energy gatherer(sometimes these are called piezoelectric energy harvester) and the passive signal conditioning of sensor signal by the comb-like electrode formed on SAW passive transponder. The energy gatherer converts external vibration energy to electrical energy and can deliver enough electrical power to the SAW excitation circuit for proper operation. The gathered energy is about 20mJ for 10 (sec) mechanical vibration input. This energy level is enough to operate active circuit components, consuming 100mW, for 200 milliseconds and adequate for long range data transmission over 30 meters. The detection range over 30 meters is the current state of the art in passive radio sensor field and this target is feasible because our previous research reached 140 centimeters detection range without any receiver front-end circuitry. The developed sensor system can be effectively used such as embedded structural monitoring system, USN, or TPMS(Tire Pressure Monitoring Systems) and the use of energy gatherer to the passive radio sensor(transponder) for the purpose of range expansion is the new concept for USN and wireless sensors.

Back to Program

Sessions Sunday Monday Tuesday Wednesday Thursday Authors

Nanotech 2005 Conference Program Abstract

 
Gold Sponsors
Nanotech Gold Sponsors
Silver Sponsors
Nanotech Silver Sponsors
Gold Key Sponsors
Nanotech Gold Key Sponsors
Nanotech Ventures Sponsors
Nanotech Ventures Sponsors
Sponsors
Nanotech Sponsors
News Headlines
NSTI Online Community
 
 

© Nano Science and Technology Institute, all rights reserved.
Terms of use | Privacy policy | Contact