Refine
Has Fulltext
- no (74)
Year of publication
Is part of the Bibliography
- yes (74)
Keywords
- piezoelectrets (3)
- Ferroelectrets (2)
- sensors and actuators (2)
- 3D printing (1)
- Cellular polypropylene (PP) (1)
- Polymer-dispersed liquid crystal (1)
- acoustic-transducer materials (1)
- charge storage (1)
- crosslinking (1)
- dielectric barrier discharge (DBD) (1)
- dielectric barrier discharges (1)
- dielectric properties (1)
- dielectric resonance spectroscopy (1)
- elastomers (1)
- electret polymers (1)
- electrical breakdown (1)
- electro-mechanical transducers (1)
- ferro- and piezoelectrets (1)
- ferroelectret (1)
- ferroelectric polymer (1)
- fluorinated ethylene-propylene copolymer (FEP) (1)
- fluoroethylenepropylene (FEP) copolymer (1)
- frequency response (1)
- functional materials (1)
- liquid crystal alignment (1)
- piezoelectret (1)
- piezoelectric measurements (1)
- piezoelectricity (1)
- piezoelectricity-polarization relation (1)
- polyethylene naphthalate (PEN) (1)
- polymer ferroelectrets (1)
- polymer-foam films (1)
- remanent polarisation (1)
- soft electro-active materials (1)
- soft matter (1)
- static-pressure dependence (1)
- temperature dependence (1)
- tubular-channel polymer systems (1)
Institute
Structural health monitoring activities are of primal importance for managing transport infrastructure, however most SHM methodologies are based on point-based sensors that have limitations in terms of their spatial positioning requirements, cost of development and measurement range. This paper describes the progress on the SENSKIN EC project whose objective is to develop a dielectric-elastomer and micro-electronics-based sensor, formed from a large highly extensible capacitance sensing membrane supported by advanced microelectronic circuitry, for monitoring transport infrastructure bridges. Such a sensor could provide spatial measurements of strain in excess of 10%. The actual sensor along with the data acquisition module, the communication module and power electronics are all integrated into a compact unit, the SENSKIN device, which is energy-efficient, requires simple signal processing and it is easy to install over various surface types. In terms of communication, SENSKIN devices interact with each other to form the SENSKIN system; a fully distributed and autonomous wireless sensor network that is able to self-monitor. SENSKIN system utilizes Delay-/Disruption-Tolerant Networking technologies to ensure that the strain measurements will be received by the base station even under extreme conditions where normal communications are disrupted. This paper describes the architecture of the SENSKIN system and the development and testing of the first SENSKIN prototype sensor, the data acquisition system, and the communication system.
Here, a promising approach for producing piezo-polymer transducers in a one-step process is presented. Using 3D-printing technology and polypropylene (PP) filaments, we are able to print a two-layered film structure with regular cavities of precisely controlled size and shape. It is found that the 3D-printed samples exhibit piezoelectric coefficients up to 200 pC/N, similar to those of other PP ferroelectrets, and their temporal and thermal behavior is in good agreement with those known of PP ferroelectrets. The piezoelectric response strongly decreases for applied pressures above 20 kPa, as the pressure in the air-filled cavities strongly influences the overall elastic modulus of ferroelectrets.