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Measuring Relative-Story Displacement and Local Inclination Angle Using Multiple Position-Sensitive Detectors
Faculty of Science and Engineering, Waseda University, Okubo 3-4-1, Shinjuku, Tokyo, Japan
Kajima Technical Research Institute, Kajima Corporation, Tamagawa1-36-1, Chofu, Tokyo, Japan
Department of Architecture, Ashikaga Institute of Technology, Ohmae-Cho 268-1, Ashikaga, Tochigi, Japan
* Author to whom correspondence should be addressed.
Received: 24 August 2010; in revised form: 5 October 2010 / Accepted: 18 October 2010 / Published: 1 November 2010
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.
Keywords: structural health monitoring; local inclination angle; relative-story displacement; position-sensitive detector; PSD
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Matsuya, I.; Katamura, R.; Sato, M.; Iba, M.; Kondo, H.; Kanekawa, K.; Takahashi, M.; Hatada, T.; Nitta, Y.; Tanii, T.; Shoji, S.; Nishitani, A.; Ohdomari, I. Measuring Relative-Story Displacement and Local Inclination Angle Using Multiple Position-Sensitive Detectors. Sensors 2010, 10, 9687-9697.
Matsuya I, Katamura R, Sato M, Iba M, Kondo H, Kanekawa K, Takahashi M, Hatada T, Nitta Y, Tanii T, Shoji S, Nishitani A, Ohdomari I. Measuring Relative-Story Displacement and Local Inclination Angle Using Multiple Position-Sensitive Detectors. Sensors. 2010; 10(11):9687-9697.
Matsuya, Iwao; Katamura, Ryuta; Sato, Maya; Iba, Miroku; Kondo, Hideaki; Kanekawa, Kiyoshi; Takahashi, Motoichi; Hatada, Tomohiko; Nitta, Yoshihiro; Tanii, Takashi; Shoji, Shuichi; Nishitani, Akira; Ohdomari, Iwao. 2010. "Measuring Relative-Story Displacement and Local Inclination Angle Using Multiple Position-Sensitive Detectors." Sensors 10, no. 11: 9687-9697.