21 July 1998 Readout of a piezoelectric distributed sensing network embedded in concrete
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In this paper, principle and system fabrication for concrete health monitoring based on embedded distributed piezoelectric sensing network are presented. Piezoelectric circular plates are embedded in concrete and the electrodes of the piezoelectric plates are wired together according to some order to form a passive stress-sensory network. For a passive piezoelectric sensory device only senses dynamic physical observables, to test the structural state in concrete, which is usually determined by static parameters, the structure is mechanically or acoustically excited to cause impact wave or acoustic wave propagation within concrete. The state parameters will modulate the caused wave and the modulated wave propagation is sensed by the piezoelectric distributed sensing network embedded in concrete. As the piezoelectric distributed sensing network can work without a power supply and outputs of all sensory elements in the network are passed through limited signal channels by addressing them, it is feasible to build up a sensing network distributed over a range of the concrete structure in large dimensions. Compared with the ultrasonic testing technique of concrete, the concrete structural health monitoring technique based on the passive piezoelectric distributed sensing network will exactly determine the structural state by capturing parameters at multiple points and avoid the uncertainty in ultrasonic testing caused by uncertain coupling condition of transmitters and receivers. The varied phase and frequency in sensing output, compared with the exciting signal, reflect the state in concrete. It is required to address one element in the sensing network in a sustained duration to get continuous output for analysis. Here, readout method of continuous output for each element in the sensing network is described in detail.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yumei Wen, Yumei Wen, Ping Li, Ping Li, Shanglian Huang, Shanglian Huang, } "Readout of a piezoelectric distributed sensing network embedded in concrete", Proc. SPIE 3330, Smart Structures and Materials 1998: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (21 July 1998); doi: 10.1117/12.316959; https://doi.org/10.1117/12.316959

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