Recently, measuring instruments for SHM of structures has been developed. In general, the wireless transmission of sensor signals, compared to its wired counterpart, is preferable due to the absence of triboelectric noise and elimination of the requirement of a cumbersome cable. However, the low-cost wireless MEMS sensor has high noise density and transmits the signal wirelessly, so data transmission delay occurs during measurement. Therefore, the footbridges that was previously measured by a mobile phone in 2014 was remeasured using G-Link-200, iPad and iPhone to compare their performance.

Abstract
 1. 서론
 2. 진동 계측 개요
  2.1 계측 보도교 개요
  2.2 계측 장치
 3. 진동 계측
  3.1 계측 방법
  3.2 계측 조건
 4. 실험 결과
 5. 결론
 References

• 이종호(서울과학기술대학교 건축과) | Lee Jong-Ho (Dept. of Architecture, Seoul National University of Science and Technology)
• 천동진(서울과학기술대학교) | Cheon Dong-Jin (Dept. of Architecture, Seoul National University of Science and Technology)
• 윤성원(서울과학기술대학교 건축학부) | Yoon Sung-Won (School of Architecture, Seoul National University of Science and Technology) 교신저자