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. 2013 Sep 30;13(10):13204-16.
doi: 10.3390/s131013204.

A wireless laser displacement sensor node for structural health monitoring

Hyo Seon Park  1 , Jong Moon Kim, Se Woon Choi, Yousok Kim
Affiliations

A wireless laser displacement sensor node for structural health monitoring

Hyo Seon Park et al. Sensors (Basel). .

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.

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Figures

Figure 1.
Figure 1.
Wireless laser displacement sensor node.
Figure 2.
Figure 2.
Wireless laser displacement sensor node.
Figure 3.
Figure 3.
Operation of the wireless laser displacement measurement system.
Figure 4.
Figure 4.
Power-saving circuit.
Figure 5.
Figure 5.
Target structure (building D).
Figure 6.
Figure 6.
Wireless laser displacement measurement devices (LDS and wireless sensor node).
Figure 7.
Figure 7.
Vertical displacement measurements.
See this image and copyright information in PMC

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