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2 Molecular and Quantum Acoustics

2 2007

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Surface acoustic wave stress sensors - designing analysis

Filipiak J, Solarz L., Steczko G.

Molecular and Quantum Acoustics

2007

Vol. 28

71-80

Analysis of viability and application of Surface Acoustic Wave stress sensors (SAW-SSs) to operational safety of buildings and other engineering constructions is the main topic of the paper. SAW stress sensors (SAW-SSs) measure the stress existing on their surface measuring the delay of the SAW signal. The stress in SAW-SS is caused by the measured stress in elements of constructions. The idea of SAW delay lines is described in [1] for example. The information about acting stress is in intermediate frequency of two SAW-SSs working in the SAW generator [3]. This system diminishes influence of the temperature at the measurements. The relatively small intermediate frequency (about 100 kHz) may be easily transmitted at the relatively long distances (about some hundreds m) by concentric cables. SAW-SSs are bound to the linear or surface elements of constructions: beams, frames, plates or shells. Bending moments change the curvature of these elements. The changing curvature of these elements causes the change of strain and stress in the plate of the SAW-SSs. The SAW-SS may also be applied to the measurement of bending instability of rods in truss or lattice constructions. The warning systems signalling overstress or bending instability may be built using SAW-SSs.

Analysis of modified surface acoustic wave stress sensors

Filipiak J, Solarz L., Steczko G.

Molecular and Quantum Acoustics

2007

Vol. 28

81-93

Analysis of designing and application of Surface Acoustic Wave stress sensors (SAW-SSs) to operational safety of buildings and other engineering constructions was the main topic of our previous paper [1]. SAW stress sensors (SAW-SSs) measure the stress existing on the surface of piezoelectric base, measuring the delay of the SAW signal. The stress in SAW-SS is caused by the measured stress in elements of constructions. In this paper the modified SAW-SS is considered. The modified SAW-SSs are bound to the linear or surface elements of constructions indirectly, on supports. This new system diminishes influence of the casings and temperature at the results of measurements. The modified and previously proposed SAW-SSs may be used to measure the stress in bent elements of the construction and may also be applied to the measurement of bending instability of rods in truss or lattice constructions. The monitoring and warning systems signalling overstress or bending instability may be built using SAW-SSs.