2018-19

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Fabrication of Piezoelectric Shoe with Path Alert System
(2019-07-05T07:37:24Z) Manjunath, V; Bharath N, Raju; Deepak, S; Aditya, N
Piezoelectric materials was first discovered by Jacques and Pierre Curie in the 19th century. The literal meaning of piezoelectric is “pressure electricity”, and this meaning aptly describes these materials, as a deformation caused by pressure on the substance will create an electric current within the material. The mechanical pressure is therefore converted voltage. Piezoelectricity is the electric charge that accumulates in certain solid materials in the response to applied mechanical stress. The nature of the piezoelectric effect is closely related to the occurrence of electric dipole moments in solids. The latter may either be induced for ions on crystal lattice sites with asymmetric charge surrounding or may directly be carried by molecular groups. The dipole density or polarization may easily be calculated for crystals by summing up the dipole moments per volume of crystallographic unit cell. As every dipole is a vector, the dipole density P is a vector field. Dipoles near each other tend to be aligned using the process of poling, a process by which a strong electric field is applied across the material, usually at elevated temperatures. Not all piezoelectric materials can be poled.