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Sensors 2013, 13(10), 13204-13216; doi:10.3390/s131013204
Article

A Wireless Laser Displacement Sensor Node for Structural Health Monitoring

1,2
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 and 2,*
Received: 5 August 2013; in revised form: 24 September 2013 / Accepted: 24 September 2013 / Published: 30 September 2013
(This article belongs to the Section Physical Sensors)
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Abstract: This study describes a wireless laser displacement sensor node that measures displacement as a representative damage index for structural health monitoring (SHM). The proposed measurement system consists of a laser displacement sensor (LDS) and a customized wireless sensor node. Wireless communication is enabled by a sensor node that consists of a sensor module, a code division multiple access (CDMA) communication module, a processor, and a power module. An LDS with a long measurement distance is chosen to increase field applicability. For a wireless sensor node driven by a battery, we use a power control module with a low-power processor, which facilitates switching between the sleep and active modes, thus maximizing the power consumption efficiency during non-measurement and non-transfer periods. The CDMA mode is also used to overcome the limitation of communication distance, which is a challenge for wireless sensor networks and wireless communication. To evaluate the reliability and field applicability of the proposed wireless displacement measurement system, the system is tested onsite to obtain the required vertical displacement measurements during the construction of mega-trusses and an edge truss, which are the primary structural members in a large-scale irregular building currently under construction. The measurement values confirm the validity of the proposed wireless displacement measurement system and its potential for use in safety evaluations of structural elements.
Keywords: laser displacement sensor; wireless sensor node; structural health monitoring; displacement measurement; irregular building; mega-truss; under construction laser displacement sensor; wireless sensor node; structural health monitoring; displacement measurement; irregular building; mega-truss; under construction
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Park, H.S.; Kim, J.M.; Choi, S.W.; Kim, Y. A Wireless Laser Displacement Sensor Node for Structural Health Monitoring. Sensors 2013, 13, 13204-13216.

AMA Style

Park HS, Kim JM, Choi SW, Kim Y. A Wireless Laser Displacement Sensor Node for Structural Health Monitoring. Sensors. 2013; 13(10):13204-13216.

Chicago/Turabian Style

Park, Hyo S.; Kim, Jong M.; Choi, Se W.; Kim, Yousok. 2013. "A Wireless Laser Displacement Sensor Node for Structural Health Monitoring." Sensors 13, no. 10: 13204-13216.



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