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Ultrasonic guided wave sensing properties of PVDF thin film with inter digital electrodes

Rathod, Vivek T and Mahapatra, Roy D (2014) Ultrasonic guided wave sensing properties of PVDF thin film with inter digital electrodes. In: Conference on Smart Sensor Phenomena, Technology, Networks, and Systems Integration, MAR 10-11, 2014, San Diego, CA.

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Official URL: http://dx.doi.org/10.1117/12.2047314

Abstract

Ultrasonic strain sensing performance of the large area PVDF with Inter Digital Electrodes (IDE) is studied in this work. Procedure to obtain IDE on a beta-phase PVDF is explained. PVDF film with IDE is bonded on a plate structure and is characterized for its directional sensitivity at different frequencies. Guided waves are induced on the IDE-PVDF sensor from different directions by placing a piezoelectric wafer actuator at different angles. Strain induced on the IDE-PVDF sensor by the guided waves in estimated by using a Laser Doppler Vibrometer (LDV) and a wave propagation model. Using measured voltage response from IDE-PVDF sensor and the strain measurements from LDV the piezoelectric coefficient is estimated in various directions. The variation of 11 e at different angles shows directional sensitivity of the IDE-PVDF sensor to the incident guided waves. The present study provides an effective technique to characterize thin film piezoelectric sensors for ultrasonic strain sensing at very high frequencies of 200 kHz. Often frequency of the guided wave is changed to alter the wavelength to interrogate damages of different sizes in Structural Health Monitoring (SHM) applications. The unique property of directional sensitivity combined with frequency tunability makes the IDE-PVDF sensor most suitable for SHM of structures.

Item Type: Conference Proceedings
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Additional Information: copyright for this article belongs to SPIE-INT SOC OPTICAL ENGINEERING, 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
Keywords: Ultrasonic; guided waves; inter digital electrodes; PVDF; piezoelectric coefficient; laser Doppler vibrometer; frequency
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering (Formerly, Aeronautical Engineering)
Date Deposited: 27 Jun 2014 05:01
Last Modified: 27 Jun 2014 05:01
URI: http://eprints.iisc.ernet.in/id/eprint/49389

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