A new sensing method based on PVDF film for material identification

Abstract

This paper proposes a new sensing method based on polyvinylidene fluoride (PVDF) film for material identification. The proposed method makes it possible that the voltages (contact voltages) induced by the piezoelectric and electrostatic effects at the contact between the PVDF film and the material are simultaneously measured. The material identification including the hardness is possible by using their voltages. In the experiment, the identification of ten kinds of materials including hardness was demonstrated by the simultaneous measurement of the voltages. The results indicate that it is possible to simultaneously measure the contact voltages, although there are still some problems that should be solved.

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

“…In robotic applications, PVDF touch sensors were good candidates [9], a novel touching sensor named Piezoelectric Oxide Semiconductor FET (POSFET) was proposed [10] and applied in human skin condition monitoring [11]. Based on the traditional PVDF touch sensor, a multilayered PVDF film was adopted to construct pain sensors [12], and identification of materials could be performed by monitoring the peak of PVDF sensors' output signal after touching target objects [13,14], and the detection of incident slippage and static friction was executed by PVDF tactile sensors with structured electrodes [15]. When compared with fragile ceramic piezoelectric materials, the native tenacity and flexibility of PVDF piezoelectric film make it an ideal candidate for shock sensors [16].…”

“…It is also noted that the sandwiched structure is adopted as the sensing element in almost all of the referenced reports. In this structure the front-side is always used as the sensing surface, and much attention has been paid to what kind of response signals could be obtained by PVDF sensors when their sensing surfaces suffered external pressure [12,15,21], friction [15], deformation [5], impact with different energies [16–18,20] or were touched with different materials [13,14], etc. , while, for their back side there are very few concerns, as we know.…”

Ageing of chemically modified poly(vinylidene fluoride) film: Evolution of triple carbon-carbon bonds infrared absorption

“…PVDF itself has a number of useful properties, due to which it is widely used in membrane technologies [14], electronics, medicine, acoustics, etc. [15,16]. Its molecules are carbon chains to each atom of which two atoms of fluorine and hydrogen are alternately attached.…”

A Novel Material Identification Method Based on Material Surface Static Electricity Discharge

“…[8] measured the induced charge signal of electrode in the process of contact, and then distinguished the specific material according to the electrostatic signal. By using electrostatic and piezoelectric composite sensor, their subsequent studies measured the hardness of the material and the amount of charges, finally achieving more than ten kinds of materials and the effective identification of hardness [9]. In the area of material identification by electrostatic method, most of researches are mainly through the detection of the amount of charge carried by the material.…”