Abstract
Conversion efficiency of mechanical impact into electrical voltage remains ever increasing demand for piezoelectric PVDF film sensor. For a given film sensor, the output voltage produced due to mechanical impact is highly dependent on the direction of stretching (or compressing) and active area of the film sensor. More is the active area of the film; higher will be the output voltage. It is shown that the active area is significantly increased due to the ridge-like shape given at the inner surfaces of the plates of sandwich type loadcell and as a result of which higher conversion efficiency is obtained. The effectiveness of the ridge-like shape is confirmed statistically by conducting two factorial design of experiment in which shape and material of the loadcell are considered as the two factors with 2×4 matrix. In case of loadcell made of glass plates, more than 100% increase in the output voltage is observed for ridge-like shape in comparison to its plain counterpart. Both the bandwidth and frequency range of the output signal is found to be independent and dependent of the loadcell materials for indirect and direct impact with the loadcell respectively. The merits and demerits of the fabricated loadcells are discussed.
Highlights
Piezoelectric polyvinylidene fluoride (PVDF) film is active sensor and behaves like a dynamic strain gauge
Apart from the energy harvesting, PVDF film is emerging as primary sensor in variety of applications due to its vast dynamic range, wide frequency coverage, high conversion efficiency, high elastic compliance, cost effectiveness etc
The application of PVDF film sensor includes a wide range of areas such as biomedical,[1,2] microforce detection,[3] irrigation,[4,5] ultrasonic sensing,[6] material quality detection,[7] dynamic stress detection,[8,9] mechanical impacts[5,10,11,12,13,14] etc
Summary
For equal mechanical impact highest output voltage is obtained for ridge-like loadcell made of plastic fiber. The % increases in the output voltage is found to be 77 to 106% in case of ridge structure compare to plain counterpart. The % increases in the output voltage is found to be 77 to 106% in case of ridge-like shape compare to plain counterpart. The main factors i.e. materials and shape types both are statistically significant. The interaction factor (between materials and shape type) is statistically significant. Using a spectrum analyser (Model: GSP-9300, Make: Gw Insteak), the frequency range of output signal (of the ridge-like shape) for various loadcells materials are indentified.
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