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Sensors 2010, 10(11), 9687-9697; doi:10.3390/s101109687

Measuring Relative-Story Displacement and Local Inclination Angle Using Multiple Position-Sensitive Detectors

1
Faculty of Science and Engineering, Waseda University, Okubo 3-4-1, Shinjuku, Tokyo, Japan
2
Kajima Technical Research Institute, Kajima Corporation, Tamagawa1-36-1, Chofu, Tokyo, Japan
3
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 / Revised: 5 October 2010 / Accepted: 18 October 2010 / Published: 1 November 2010
(This article belongs to the Special Issue Advanced Sensing Technology for Nondestructive Evaluation)
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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 -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. View Full-Text
Keywords: structural health monitoring; local inclination angle; relative-story displacement; position-sensitive detector; PSD structural health monitoring; local inclination angle; relative-story displacement; position-sensitive detector; PSD
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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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.

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