Analysis of the sensitivity and the temperature influence of a static force sensor based on a PVDF resonator

Ngalamou, L.; Noury, Norbert; Chamberod, Eric; Benech, Ph.

doi:10.1016/s0924-4247(97)80110-0

Cited by 16 publications

(9 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is accepted that the response of a PVDF senor is influenced by many conditions, such as the ambient temperature [24], the smoothness of the touched object [11] and the structure of electrodes [15]. It is also noted that the sandwiched structure is adopted as the sensing element in almost all of the referenced reports.…”

Section: Introductionmentioning

confidence: 99%

Dependence of the Impact Response of Polyvinylidene Fluoride Sensors on Their Supporting Materials’ Elasticity

Jia

Chen

et al. 2013

Sensors

View full text Add to dashboard Cite

Polyvinylidene fluoride (PVDF) is popular sensing material because of its unique piezoelectric characteristics. In this work an impact sensor was prepared from a sandwiched structure PVDF film, and the related detection circuits were presented. The dependence of the PVDF sensors' response on the elasticity of the supporting materials was examined and discussed. Here two response indexes were discussed, which were the peak-to-peak voltage (Vpp) and the recovery time. Firstly, falling impact experiments were executed on desk-supported PVDF sensors (100 μm PVDF film) using free falls of different weights from different heights. Then the same shock experiments were repeated on the same sensor, but changing the backstops to a sponge and rubber, respectively. On the desk, the values of Vpp were bigger than when the other two backstops were used; but the changes of the impact energy could not be reflected by the PVDF sensor when it was supported by a hard material. It was found that the biggest sensitivity of the voltage response (about 96.62 V/J) was obtained by the sponge-supported sensor; for the same sensor, when it was supported by rubber, the slope was 82.26 V/J. Moreover, the recovery time for the desk-supported sensor was almost constant, varying from 0.15 to 0.18 s, while for the same sensor supported by sponge or rubber, its recovery time changed with the shifting of the impact energy in the range of 0.02∼0.36 s, but no pattern could be found in the recovery-time characteristics.

show abstract

Section: Introductionmentioning

confidence: 99%

Dependence of the Impact Response of Polyvinylidene Fluoride Sensors on Their Supporting Materials’ Elasticity

Jia

Chen

et al. 2013

Sensors

View full text Add to dashboard Cite

show abstract

“…Based on the fact that the quality factor will also change significantly with stress from the large-signal inverse piezoelectric effect, we use the RMS voltage at a fixed frequency near the resonance as a measure of applied pressure. The device shows a sensitivity of 0.038MHz/kPa resonance frequency shift, where the response is mostly linear [8]. The real schematic for the measurement and equipment connections are illustrated in Figure 4.…”

Section: Methodsmentioning

confidence: 99%

A Low-Range Drift-Free Bio-compatible Pressure Sensor Based on P(VDF-TrFE) Piezoelectric Thin Film

Reissman

et al. 2009

MRS Proc.

View full text Add to dashboard Cite

A low-range pressure sensor (0-100kPa) based on the P(VDF-TrFE) piezoelectric thin film is proposed, where the long-term drift is eliminated by operating near the piezoelectric resonance. The pressure sensor is designed for blood pressure and tissue swelling pressure monitoring. The poled 50µm±1µm P(VDF-TrFE) copolymer film is used as the sensing element, with all fabrication and assembly materials biocompatible. A modified Butterworth-Van Dyke (BVD) [1] equivalent circuit model is used to characterize the sensor behavior. The pressure sensor exhibits negligible drift in weeks of operation. The device shows a sensitivity of 0.038MHz/kPa resonance frequency shift under stress, which leads to a maximum readout change of 1.1%/kPa in the present setup.

show abstract

“…Temperature, 0 C Figure 3.3: Temperature coefficient for d 3l and g 3l constants for PVDF film [24] Many of Properties of Piezo film change with temperature, these properties are reversible and repeatable with temperature cycling [27]. …”

Section: -» -10mentioning

confidence: 99%

Theoretical and experimental investigations for measuring interfacial bonding strength between ice and substrate /

Javan-Mashmool¹

2005

View full text Add to dashboard Cite

DedicationI dedicate this thesis in loving memory of my parents who have always been very supportive, understanding and encouraging through my study. Ill AbstractThis Master study deals with the development of a mechanical technique for measuring interfacial bonding strength of atmospheric ice, using embedded piezoelectric film (PVDF) sensors at the ice/substrate interface. The substrate is an aluminum beam on which PVDF piezoelectric sensors are bonded. The composite beam, formed by an aluminum beam and a deposited ice layer, is submitted to sinusoidal stress at the interface by an electromagnetic shaker on which one end of the beam is clamped. The ice layer is deposited artificially on the aluminium beam from sprayed supercooled water droplets in order to simulate atmospheric icing on structures.The piezoelectric charge coefficient is used to predict the electric charge density induced on the piezoelectric (PVDF) film which enables us to develop a macroscopic and direct measurement technique for determining mechanical stresses at the atmosphericice/substrate interface. All tests have been performed for a frequency close to the natural resonance frequency of the aluminum beam. The tests were carried out on two series of aluminum beams with two different finishes and on Plexiglas.It may be observed that, in all test series, with an increase in displacement amplitude of the clamped end, the interface stress increases approximately linear until delamination or IV ice de-bonding occurrence at the film position. At this specific moment a drastic change in the interface stress occurred resulting from a local redistribution of the bending and shear stress. Hence, the interface stress obtained at this specific moment corresponds to the stress required to de-bond the ice from its substrate (ice adhesion strength). The obtained empirical results demonstrate that ice adhesion strength depends on the surface finish, as it is more finished the adhesion strength is less. The experimental results prove that ice adhesion strength significantly depends on substrate type as the adhesion strength on Plexiglas surface was 100 times less than on the aluminum surface. Within the limitations of the experimental conditions, it was possible using this approach to estimate ice adhesion strengths in accordance with those obtained in literature. This demonstrates the feasibility of this simple ice adhesion testing method.

show abstract

Analysis of the sensitivity and the temperature influence of a static force sensor based on a PVDF resonator

Cited by 16 publications

References 1 publication

Dependence of the Impact Response of Polyvinylidene Fluoride Sensors on Their Supporting Materials’ Elasticity

Dependence of the Impact Response of Polyvinylidene Fluoride Sensors on Their Supporting Materials’ Elasticity

A Low-Range Drift-Free Bio-compatible Pressure Sensor Based on P(VDF-TrFE) Piezoelectric Thin Film

Theoretical and experimental investigations for measuring interfacial bonding strength between ice and substrate /

Contact Info

Product

Resources

About