US 12,699,007 B2 · Passive pyroelectric infrared sensor with sensor elements on a single crystal

Abstract

Described herein are techniques for reducing spike noise arising in pyroelectric infrared sensors due to charge build up. The sensors developed by the inventors and described herein rely on the use of dummy elements positioned to prevent or limit charge build-up in the unused space. A first sensing element comprises a first portion of the first layer of conductive material, a first portion of the layer of pyroelectric material, a first portion of the second layer of conductive material and a first absorption region coupled to the first portion of the first layer of conductive material. A dummy element comprises a second portion of the first layer of conductive material, a second portion of the layer of pyroelectric material and a second portion of the second layer of conductive material. The first layer of conductive material defines a first gap between the first portion of the first layer of conductive material and the second portion of the first layer of conductive material.

Claims20

Dependent claims

A pyroelectric sensor comprising:

a layer of pyroelectric material having a first surface and a second surface opposite the first surface;
a first layer of conductive material coupled to the first surface of the layer of pyroelectric material, and a second layer of conductive material coupled to the second surface of the layer of pyroelectric material;
a first sensing element comprising a first portion of the first layer of conductive material, a first portion of the layer of pyroelectric material, a first portion of the second layer of conductive material, and a first absorption region coupled to the first portion of the first layer of conductive material;
and
a dummy element comprising a second portion of the first layer of conductive material, a second portion of the layer of pyroelectric material and a second portion of the second layer of conductive material, wherein the first layer of conductive material defines a first gap between the first portion of the first layer of conductive material and the second portion of the first layer of conductive material.

2 more elements

Dependencies are inferred from the claim text.

Passive pyroelectric infrared sensor with sensor elements on a single crystal

Life of this patent

Passive pyroelectric infrared sensor with sensor elements on a single crystal

Life of this patent

Abstract

Claims20