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A four-quadrant PVDF transducer for surface acoustic wave detection.

Lu Z, Dorantes-Gonzalez DJ, Chen K, Yang F, Jin B, Li Y, Chen Z, Hu X - Sensors (Basel) (2012)

Bottom Line: In this paper, a polyvinylidene fluoride (PVDF) piezoelectric transducer was developed to detect laser-induced surface acoustic waves in a SiO(2)-thin film-Si-substrate structure.In order to solve the problems related to, firstly, the position of the probe, and secondly, the fact that signals at different points cannot be detected simultaneously during the detection process, a four-quadrant surface acoustic wave PVDF transducer was designed and constructed for the purpose of detecting surface acoustic waves excited by a pulse laser line source.The experimental results of the four-quadrant piezoelectric detection in comparison with the commercial nanoindentation technology were consistent, the relative error is 0.56%, and the system eliminates the piezoelectric surface wave detection direction deviation errors, improves the accuracy of the testing system by 1.30%, achieving the acquisition at the same time at different testing positions of the sample.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Weijin Road, No. 92, Tianjin 300072, China. zimo.lu@yahoo.cn

ABSTRACT
In this paper, a polyvinylidene fluoride (PVDF) piezoelectric transducer was developed to detect laser-induced surface acoustic waves in a SiO(2)-thin film-Si-substrate structure. In order to solve the problems related to, firstly, the position of the probe, and secondly, the fact that signals at different points cannot be detected simultaneously during the detection process, a four-quadrant surface acoustic wave PVDF transducer was designed and constructed for the purpose of detecting surface acoustic waves excited by a pulse laser line source. The experimental results of the four-quadrant piezoelectric detection in comparison with the commercial nanoindentation technology were consistent, the relative error is 0.56%, and the system eliminates the piezoelectric surface wave detection direction deviation errors, improves the accuracy of the testing system by 1.30%, achieving the acquisition at the same time at different testing positions of the sample.

No MeSH data available.


Four-quadrant wedge probes.
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f4-sensors-12-10500: Four-quadrant wedge probes.

Mentions: Based on the propagation theory of line sources for exciting surface acoustic waves, the detection region was divided into four quadrants A+, A−, B+, and B−. There are four quadrant piezoelectric foil transducers (see Figure 3) and four quadrant wedges (see Figure 4) on the corresponding locations respectively. When the signals obtained by A+ and A− coincide, as well as the signals obtained by B+ and B− coincide, that indicates that the detection line is paralleled with the wave front, and meaning that the detection line is perpendicular to the surface acoustic wave propagation direction. Otherwise, the detection line deviates from the surface acoustic wave front. Adjustment for the position of the four-quadrant wedges is needed until the signals from the corresponding quadrants coincide. Signals A+ and B+ or signals of A− and B− are used to calculate the dispersion curves, and what is more, the dispersion curves are calculated from the same excitation pulses picked up in different locations at the same time.


A four-quadrant PVDF transducer for surface acoustic wave detection.

Lu Z, Dorantes-Gonzalez DJ, Chen K, Yang F, Jin B, Li Y, Chen Z, Hu X - Sensors (Basel) (2012)

Four-quadrant wedge probes.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3472840&req=5

f4-sensors-12-10500: Four-quadrant wedge probes.
Mentions: Based on the propagation theory of line sources for exciting surface acoustic waves, the detection region was divided into four quadrants A+, A−, B+, and B−. There are four quadrant piezoelectric foil transducers (see Figure 3) and four quadrant wedges (see Figure 4) on the corresponding locations respectively. When the signals obtained by A+ and A− coincide, as well as the signals obtained by B+ and B− coincide, that indicates that the detection line is paralleled with the wave front, and meaning that the detection line is perpendicular to the surface acoustic wave propagation direction. Otherwise, the detection line deviates from the surface acoustic wave front. Adjustment for the position of the four-quadrant wedges is needed until the signals from the corresponding quadrants coincide. Signals A+ and B+ or signals of A− and B− are used to calculate the dispersion curves, and what is more, the dispersion curves are calculated from the same excitation pulses picked up in different locations at the same time.

Bottom Line: In this paper, a polyvinylidene fluoride (PVDF) piezoelectric transducer was developed to detect laser-induced surface acoustic waves in a SiO(2)-thin film-Si-substrate structure.In order to solve the problems related to, firstly, the position of the probe, and secondly, the fact that signals at different points cannot be detected simultaneously during the detection process, a four-quadrant surface acoustic wave PVDF transducer was designed and constructed for the purpose of detecting surface acoustic waves excited by a pulse laser line source.The experimental results of the four-quadrant piezoelectric detection in comparison with the commercial nanoindentation technology were consistent, the relative error is 0.56%, and the system eliminates the piezoelectric surface wave detection direction deviation errors, improves the accuracy of the testing system by 1.30%, achieving the acquisition at the same time at different testing positions of the sample.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Weijin Road, No. 92, Tianjin 300072, China. zimo.lu@yahoo.cn

ABSTRACT
In this paper, a polyvinylidene fluoride (PVDF) piezoelectric transducer was developed to detect laser-induced surface acoustic waves in a SiO(2)-thin film-Si-substrate structure. In order to solve the problems related to, firstly, the position of the probe, and secondly, the fact that signals at different points cannot be detected simultaneously during the detection process, a four-quadrant surface acoustic wave PVDF transducer was designed and constructed for the purpose of detecting surface acoustic waves excited by a pulse laser line source. The experimental results of the four-quadrant piezoelectric detection in comparison with the commercial nanoindentation technology were consistent, the relative error is 0.56%, and the system eliminates the piezoelectric surface wave detection direction deviation errors, improves the accuracy of the testing system by 1.30%, achieving the acquisition at the same time at different testing positions of the sample.

No MeSH data available.