title: Measuring relative-story displacement and local inclination angle using multiple position-sensitive detectors.
abstract: We propose a novel sensor system for monitoring the structural health of a building. The system optically measures the relative-story displacement during earthquakes for detecting any deformations of building elements. The sensor unit is composed of three position sensitive detectors (PSDs) and lenses capable of measuring the relative-story displacement precisely, even if the PSD unit was inclined in response to the seismic vibration. For verification, laboratory tests were carried out using an Xθ-stage and a shaking table. The static experiment verified that the sensor could measure the local inclination angle as well as the lateral displacement. The dynamic experiment revealed that the accuracy of the sensor was 150 μm in the relative-displacement measurement and 100 μrad in the inclination angle measurement. These results indicate that the proposed sensor system has sufficient accuracy for the measurement of relative-story displacement in response to the seismic vibration.
authors.affiliation: Faculty of Science and Engineering, Waseda University, Okubo 3-4-1, Shinjuku, Tokyo, Japan. matsuya@aoni.waseda.jp
authors.forename: Iwao
authors.initials: I
authors.lastname: Matsuya
authors.forename: Ryuta
authors.initials: R
authors.lastname: Katamura
authors.forename: Maya
authors.initials: M
authors.lastname: Sato
authors.forename: Miroku
authors.initials: M
authors.lastname: Iba
authors.forename: Hideaki
authors.initials: H
authors.lastname: Kondo
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Kanekawa
authors.forename: Motoichi
authors.initials: M
authors.lastname: Takahashi
authors.forename: Tomohiko
authors.initials: T
authors.lastname: Hatada
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Nitta
authors.forename: Takashi
authors.initials: T
authors.lastname: Tanii
authors.forename: Shuichi
authors.initials: S
authors.lastname: Shoji
authors.forename: Akira
authors.initials: A
authors.lastname: Nishitani
authors.forename: Iwao
authors.initials: I
authors.lastname: Ohdomari
mesh_terms: D004867:Equipment Design; D055617:Micro-Electrical-Mechanical Systems / Q000295:instrumentation*