A relative-story displacement sensor for structural health monitoring capable of measuring the local inclination angle and the relative displacement

Iwao Matsuya, Ryuta Katamura, Maya Sato, Hideaki Kondo, Miroku Iba, Kiyoshi Kanekawa, Yoshihiro Nitta, Takashi Tanii, Shuichi Shoji, Akira Nishitani, Iwao Ohdomari

Research output: Contribution to journalArticle


We propose a novel relative-story displacement sensor for structural health monitoring. The sensor is composed of three pairs of position sensitive detector (PSD) units and light emitting diode (LED) arrays, and is capable of measuring both the local inclination angle of the PSD unit and the relative displacement between the PSD unit and the LED array. By immobilizing the LED arrays on the ceiling and the PSD units on the floor, we can accurately measure the relative-story displacement in real time. We have verified the measurement accuracy of the developed sensor using a shaking table and a θ stage, and the accuracy was evaluated to be approximately 0.15 mm in the displacement and 0.1 mrad in the local rotation angle. The results indicate that the developed sensor is applicable to the relative-story displacement measurement for the diagnostics of an actual building.

Original languageEnglish
Pages (from-to)736-740
Number of pages5
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Issue number777
Publication statusPublished - 2011 Dec 1



  • Damage Evaluation
  • Local Inclination Angle
  • Nondestructive Inspection
  • Optical Measurement
  • Position Sensitive Detector (PSD)
  • Relative Story Displacement
  • Structural Health Monitoring

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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