Thermal sensor with two superposed pyroelectric portions for measuring a charge differential

A thermal patterns sensor of a pyroelectric sensor type, comprising a contact surface to apply on it an object to be imaged and a plurality of pixels distributed between a substrate and said contact surface,

• wherein each pixel comprises:
• at least one charge collection electrode;
• a first structure, including a first portion comprising a pyroelectric material, said first structure being in direct physical contact with one of the at least one charge collection electrode;
• a second structure, including a second portion comprising a pyroelectric material, said second structure being in direct physical contact with one of the at least one charge collection electrode, wherein the first structure, the second structure and the at least one charge collection electrode are superposed above the substrate;
• at least one heating element to heat the first and second portions comprising a pyroelectric material;
• and
• an electronic device connected to the at least one charge collection electrode, and configured to measure a difference between charges generated by one among the first and the second portions comprising a pyroelectric material, and charges generated by the other among the first and second portions comprising a pyroelectric material.