Wireless Modal Testing with Multiple Battery-free Backscatter Sensors

Jin Mitsugi, Osamu Tokumasu, Yuusuke Kawakita

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper reports the design, implementation and the result of real-world experiment of wireless modal testing with battery-free backscatter sensors. The battery-free backscatter sensor comprises a custom radio frequency integrated circuit (RFIC), a commodity micro electro-mechanical system (MEMS) accelerometer, and an antenna. Sensor data concurrency demanded in modal analysis is realized by allocating a dedicated subcarrier to each backscatter sensor. The orchestration of wireless communications in 920 MHz based on Gen2 protocol and the wireless power supply to the backscatter sensor are performed by a software defined interrogator built on Lab-VIEW communications and USRP. We developed an over the air (OTA) subcarrier frequency allocation with a sequence of WRITE commands of Gen2 protocol, and its performance was confirmed with the experiments in an indoor radio propagation. The accuracy of the proposed wireless structural modal testing was experimentally verified by comparing with a commercial modal test system with wired accelerometers. Although the phase characteristic measurement is disturbed by the instability of the clock source of RFIC, the gain characteristics of wireless modal testing matches well with that of a commercial wired modal testing system.

Original languageEnglish
Title of host publication2021 IEEE International Conference on Wireless for Space and Extreme Environments, WiSEE 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages90-96
Number of pages7
ISBN (Electronic)9781665403719
DOIs
Publication statusPublished - 2021
Event2021 IEEE International Conference on Wireless for Space and Extreme Environments, WiSEE 2021 - Cleveland, United States
Duration: 2021 Oct 122021 Oct 14

Publication series

Name2021 IEEE International Conference on Wireless for Space and Extreme Environments, WiSEE 2021

Conference

Conference2021 IEEE International Conference on Wireless for Space and Extreme Environments, WiSEE 2021
Country/TerritoryUnited States
CityCleveland
Period21/10/1221/10/14

Keywords

  • backscatter
  • Batteryless sensors
  • modal testing
  • over the air

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Computer Networks and Communications
  • Aerospace Engineering
  • Instrumentation

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