Development of a PVDF film sensor for infrastructure monitoring

1999 ◽  
Author(s):  
Debashis Satpathi ◽  
J. P. Victor ◽  
Ming L. Wang ◽  
H.Y. Yang ◽  
C. C. Shih
Keyword(s):  
Pvdf Film ◽  
Film Sensor ◽  
Infrastructure Monitoring

Finger-Mounted Tactile Sensor for Evaluating Surfaces

2012 ◽  
Vol 24 (3) ◽  
pp. 430-440 ◽  
Author(s):  
Ryo Kikuuwe ◽  
◽  
Kenta Nakamura ◽  
Motoji Yamamoto
Keyword(s):  
Polyvinylidene Fluoride ◽  
Tactile Sensor ◽  
Pvdf Film ◽  
Signal Sequences ◽  
Film Sensor ◽  
Hand Motion ◽  
Textile Fabrics ◽  
Thin Structure ◽  
Voltage Signal ◽  
Area Expansion

This paper presents a finger-mounted tactile sensor for extracting information on fine surface properties of objects such as textile fabrics. The prototype sensor has a thin structure composed of a sheet of PVDF (polyvinylidene fluoride) film sensor and some metal parts for converting compressive forces into area expansion of the PVDF film. By using a signal processing program based on the FFT (fast Fourier transform), voltage signal sequences from nine different fabrics were distinguished, even in the presence of variations in the pressing force and the speed of rubbing motion induced by the fluctuations in the user’s hand motion. In addition, the signal sequences from abraded fabrics were sorted by their levels of abrasion by extracting a signal component correlated with the abrasion level.11. This paper is the full translation from the transactions of JSME, Series C, Vol.77, No.784, 2011.

1222 Development of crack monitoring technique by using PVDF film sensor

2007 ◽  
Vol 2007.10 (0) ◽  
pp. 86-90
Author(s):  
Koichi YOKOYAMA ◽  
Kazumi SHIRATO ◽  
Kikuzirou TANABE ◽  
Yuka AJIRO ◽  
Takao HARADA
Keyword(s):  
Pvdf Film ◽  
Film Sensor ◽  
Monitoring Technique ◽  
Crack Monitoring

A Disposable PVDF Sensor Applied for the Detection of Fatigue Crack Growth in Bonded Composite Joints

2002 ◽  
Author(s):  
Oh-Yang Kwon ◽  
Dana Brosig ◽  
Kalyan Nistala ◽  
Yuris A. Dzenis
Keyword(s):  
Fatigue Crack ◽  
Composite Materials ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Composite Structures ◽  
Lap Joints ◽  
Pvdf Film ◽  
Film Sensor ◽  
Current Limit ◽  
Ae Signals

The application of polyvinylidene di-fluoride (PVDF) film as an acoustic emission (AE) sensor appears to be practical to detect the fatigue crack growth in composite materials and structures. A commercially available PVDF film sensor was employed to detect AE due to fatigue crack growth in the single-lap joints of graphite/epoxy laminates. Although the signal-to-noise ratio is not as high as those measured by PZT sensors, the result showed that the location of crack front could be predicted by the linear location of AE signals detected by the PVDF sensors. Since the composite materials usually produce very energetic AE signals, the extremely cost-effective form of PVDF sensors can be permanently mounted on composite structures for structural health monitoring as disposable ones. Piezoelectric polymer sensors are expected to be eventually embedded in composite structures provided the current limit of use temperature being increased by introducing co-polymerization with some heat resistant constituents.

Heartbeat Monitoring Technique Based on Corona-Poled PVDF Film Sensor for Smart Apparel Application

2007 ◽  
Vol 124-126 ◽  
pp. 299-302 ◽  
Author(s):  
You Min Chang ◽  
Jong Soon Lee ◽  
Kap Jin Kim
Keyword(s):  
Electric Field ◽  
Polyvinylidene Fluoride ◽  
Ferroelectric Properties ◽  
Computer Applications ◽  
Polymer Materials ◽  
Pvdf Film ◽  
Internal Electric Field ◽  
Film Sensor ◽  
Β Phase ◽  
Voltage Amplifier

Flexible piezoelectric polymer materials for smart apparel and wearable computer applications are of great interest. Among known ferroelectric and piezoelectric polymers, polyvinylidene fluoride (PVDF) exhibit β-phase under poling and is known to give highest piezo-, pyro-, and ferroelectric properties. Previous reports suggests that, during corona poling of the PVDF film, a high surface electric potential is generated resulting in a high internal electric field within the polymer film causing the polarization of the dipoles along the direction of the applied electric field. The resultant phase change from α- to β-phase and the dipole switching generates displacement of charges or piezoelectricity. And also mechanical variation would change dipole density of PVDF film. In this report, we measured human heartbeat signal from an DAQ interfaced with a custommade voltage-amplifier with specific frequency filtering function using the corona-poled PVDF film of various sizes and thickness as a piezoelectric sensor and analyzed it. We employed elastic textile band to sensor system for comfortable fit on wrist or ankle. And then, we found the feasibility of applying flexible PVDF film sensor to smart apparel application which can sense heartbeat rate, blood pressure, respiration rate, accidental external impact on human body, etc.

scholarly journals Perancangan Signal Conditioning Sensor Piezo Film Untuk Pengujian Model Struktur Akibat Tsunami

2010 ◽  
Vol 3 (1) ◽  
pp. 29-32
Author(s):  
Totok Sudarto ◽  
Mochamad Guruh
Keyword(s):  
Pvdf Film ◽  
Signal Conditioning ◽  
Film Sensor

Perancangan yang tepat  dari rangkaian interface untuk optimasi Piezo Film Sensor (PVDF film)mempunyai peranan sangat penting. Karena aplikasi-aplikasi dari piezo film sangatlah luas, mulai dari hal-hal yang menyangkut mainan anak-anak sampai dengan keperluan uji laboratorium bahkan sensor-sensor militer dan interfacing terhadap rangkaian elektronik sangatlah bergantung padaaplikasinya. Dalam banyak hal, piezo film dapat secara langsung dihubungkan pada rangkaianelektronik tanpa pertimbangan memerlukan interface khusus. Namun demikian, untuk hal-hal  tersebutdimana dibutuhkan sebuah rangkaian interface, ada beberapa langkah yang harus dipertimbangkan yangmenyangkut topologi yang paling sesuai untuk aplikasi yang dibutuhkan. Pada makalah ini hanya dibahas tentang perancangan dan pembuatan signal conditioning untuk kebutuhan pengujian Modelkekuatan struktur akibat  gelombang tsunami.

High Signal-to-Noise Ratio Phonocardiogram using a Shielded PVDF Film Sensor

2016 ◽  
Vol 14 (3) ◽  
pp. 1139-1145 ◽  
Author(s):  
Karen Vazquez ◽  
Juan Cota ◽  
Ernesto Sifuentes ◽  
Rafael Gonzalez
Keyword(s):  
Signal To Noise Ratio ◽  
Pvdf Film ◽  
High Signal ◽  
Signal To Noise ◽  
Film Sensor ◽  
Noise Ratio
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