Thermal sensor with two superposed pyroelectric portions for measuring a charge differential
US10591360B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 20, 2018 |
| Grant date | Mar 17, 2020 |
| Priority date | — |
| Expiry date | Sep 12, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/1306
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A pyroelectric sensor includes several pixels distributed above a substrate and each pixel includes a first portion made of a pyroelectric material, in direct physical contact with a charge collection electrode, a second portion made of a pyroelectric material, in direct physical contact with a charge collection electrode, the first portion, the second portion and the at least one charge collection electrode being superposed above the substrate, at least one heating element to heat the first and second portions including a pyroelectric material, and an electronic device to measure a difference between charges generated by the first portion including a pyroelectric material and charges generated by the second portion including a pyroelectric material. The pyroelectric sensor makes it possible to suppress a useless part of a measurement signal. It is particularly advantageous for taking an image of a papillary print.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.