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Proceedings Paper

Laser technique for measuring three-dimensional interstory drift
Author(s): Weimin Chen; Kim D. Bennett; Jun Feng; Yi-Ping Wang; Shanglian Huang
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Paper Abstract

A method for detecting interstory drift and chord drift in buildings is proposed and demonstrated based on the motion of a laser generated cross hair in free space. The beam is projected form ceiling to floor onto an arrangement of four position sensitive detectors, each with two separate outputs. Every lateral displacement and relative angle between ceiling and floor gives a unique set of detector voltages, so that as floors shift with respect to one another due to wind and earthquake loads, voltages vary, the new beam axis location is determined, and the 3D interstory drift, velocity, and acceleration can be obtained. Experimental results show excellent linearity and sensitivity of roughly 10 microns for lateral displacement and 0.02 degrees for relative rotation between ceiling and floor.

Paper Details

Date Published: 13 August 1998
PDF: 6 pages
Proc. SPIE 3555, Optical and Fiber Optic Sensor Systems, (13 August 1998); doi: 10.1117/12.318209
Show Author Affiliations
Weimin Chen, Chongqing Univ. (China)
Kim D. Bennett, Lafayette College (United States)
Jun Feng, Chongqing Univ. (China)
Yi-Ping Wang, Chongqing Univ. (China)
Shanglian Huang, Chongqing Univ. (China)

Published in SPIE Proceedings Vol. 3555:
Optical and Fiber Optic Sensor Systems
Shanglian Huang; Kim D. Bennett; David A. Jackson, Editor(s)

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