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The  newly  developed  low-cost  micro-electro-mechanical  system  (MEMS)-based 

acceleration  sensors  exhibit  sufficient  accuracy  and  stability  to  monitor  the  shaking  of 

structures  caused  by  an  earthquake.  We  have  developed  a  practical  shaking-monitoring 

system  using  MEMS-based  acceleration  sensors  and  a  920  MHz  multi-hop  radio 

communication method that offers reliable radio wave communication, even within buildings. 

In this system, the base clock of each sensor unit must be closely synchronized to the master 

clock to minimize acceleration-induced phase synchronization error. In the proposed system, 

this error can be limited to three milliseconds in a system of multiple sensor units.

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== Full document ==

<pdf>Media:Draft_Content_203213390p607.pdf</pdf>

== References ==

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[1] Cultural Properties Protection Department, Guideline for Assessing Seismic Resistance of  Important Cultural Properties (Buildings), (2012).  

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[2] Nagai,  N.,  Mita,  A.,  Yakoh,  T.  and  Sato,  T.:  Wireless  Sensor  for  Structural  Health  Monitoring, Journal of Japan Association for Earthquake Engineering, Vol.3, No.4 (2003),  pp.1-13.  

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[3] Sawada,  M.,  Shiba,  Y.  and  Oguni,  K.:  Development  of  robust  time  synchronization  method  for  wireless  sensor  network,  Journal  of  Japan  Society  of  Civil  Engineers  A1  (Structural Engineering & Earthquake Engineering), Vol.65, No.1 (2009), pp.30-37.  

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[4] Nakannishi,  Y.:  Development  and  operation  of  the  practical  field  monitoring  systems  based  on  openATOMS, Proceedings of Annual Conference of Electronics, Information  and Systems Society (2011), pp.724-727.  

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[5] Allen  Fan:  How  to  Improve  the  Accuracy  of  Inclination  Measurement  Using  An  accelerometer, AnalogDialogue, Vol.52 (2018), Analog Devices.  

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[6] Takahiro  Yamasaki,  Yuichiro  Amano,  Kana  Ota,  Mitsuhiro  Miyamoto  and  Masatoshi  Okada: Development  of  wireless  acceleration  measurement  system  applied  to  structural  health  monitoring  –  Consideration  for  introduction  to  existing  buildings  -, Journal of  Structural and Construction Engineering (Transactions of AIJ), Vol.84, No.765, pp.1389- 1399. (2019.11).

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