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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.


PVDF piezoelectric transducer SAW detection system schematic diagram.
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f5-sensors-12-10500: PVDF piezoelectric transducer SAW detection system schematic diagram.

Mentions: The system used a 532 nm wavelength, 800 ps pulse laser as the surface acoustic wave excitation source. The pulse laser passes through a collimating and expanding beam treatment, it is reflected downwards, and passed through a cylindrical convex lens, gathering the beam into a straight line on the surface of the sample, and consequently, generating the SAW. After the surface waves propagate along the sample surface for a certain distance, they are detected by an oscilloscope acquisition system, passing through a charge amplifier, and then the experimental signals are loaded into a computer that process and uses an algorithm that compares the dispersion curve with that of a theoretical model, thereby obtaining the Young's modulus of the thin film. A schematic diagram of the SAW detection system is shown in Figure 5.


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)

PVDF piezoelectric transducer SAW detection system schematic diagram.
© Copyright Policy
Related In: Results  -  Collection

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

f5-sensors-12-10500: PVDF piezoelectric transducer SAW detection system schematic diagram.
Mentions: The system used a 532 nm wavelength, 800 ps pulse laser as the surface acoustic wave excitation source. The pulse laser passes through a collimating and expanding beam treatment, it is reflected downwards, and passed through a cylindrical convex lens, gathering the beam into a straight line on the surface of the sample, and consequently, generating the SAW. After the surface waves propagate along the sample surface for a certain distance, they are detected by an oscilloscope acquisition system, passing through a charge amplifier, and then the experimental signals are loaded into a computer that process and uses an algorithm that compares the dispersion curve with that of a theoretical model, thereby obtaining the Young's modulus of the thin film. A schematic diagram of the SAW detection system is shown in Figure 5.

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.