Development of an FBG-sensed miniature pressure transducer and its applications to geotechnical centrifuge modelling

An Bin Huang, Kuen Wei Wu, Mohammed Z.E.B. Elshafie, Wen Yi Hung, Yen Te Ho

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Because of the elevated gravity and dimensional constraints, miniaturized sensors are required to measure pore pressure within soil specimens in geotechnical centrifuge testing. Electrical sensors have been used for the purpose. The small dimensions and their mechanical configurations made the available electrical pore pressure sensors fragile. They can be easily damaged in specimen preparation and testing. The electrical sensors tend to have a nonlinear and non-repeatable behavior in negative pressure range. Taking advantage of the optical fiber Bragg grating (FBG), the authors developed an FBG based miniature pore pressure sensor. The FBG sensors are immune to moisture and electromagnetic interference. The readings are linear in both positive and negative pressure range. A specially made FBG readout unit capable of taking readings at 10 kHz was used to monitor the pore pressure within the soil specimen in dynamic centrifuge tests. The paper describes and design of the miniature FBG pore pressure transducer system and its applications in static and dynamic physical model tests at the Cambridge University and National Central University geotechnical centrifugal testing facilities.

Original languageEnglish
Title of host publicationSpringer Series in Geomechanics and Geoengineering
EditorsWei Wu, Hai-Sui Yu
PublisherSpringer Verlag
Pages694-698
Number of pages5
ISBN (Print)9783319971117
DOIs
StatePublished - 2018
EventChina-Europe Conference on Geotechnical Engineering, 2016 - Vienna, Austria
Duration: 13 Aug 201616 Aug 2016

Publication series

NameSpringer Series in Geomechanics and Geoengineering
ISSN (Print)1866-8755
ISSN (Electronic)1866-8763

Conference

ConferenceChina-Europe Conference on Geotechnical Engineering, 2016
Country/TerritoryAustria
CityVienna
Period13/08/1616/08/16

Keywords

  • FBG
  • Geotechnical centrifuge test
  • Pore pressure sensing

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