Procedure to polarize at least one zone of a foil of ferroelectric material to produce a polarized element for piezoelectric or pyroelectric transducers

Process of polarizing at least one zone (22) on a foil of ferroelectric material (19), comprising the steps of:

• connecting each of two polarization electrodes (10, 11) to a corresponding insulating support (12, 15) whose surface area exceeds that of the zone to be polarized (22) on the foil (19), said support (12, 15) comprising a layer of dielectric material (14, 17) whose external surface (14a, 17a) is made level with the external surface (10a, 11a) of the polarization electrode (10, 11), on either side of the polarization electrode (10, 11), wherein the layer of dielectric material (14, 17) is at least twice as thick as the foil (19) of the material to be polarized;
• positioning said polarization electrodes (10, 11) connected to said insulating support (12, 15) on two opposite surfaces (20, 21) of said foil (19) with the zone to be polarized (22) extending between said polarization electrodes (10, 11);
• compressing the zone to be polarized (22) by applying a pressure on said insulating supports (12, 15);
• and
• applying a variable voltage across the polarization electrodes (10, 11) to form said at least one polarized zone on said foil.