Passive infrared sensor systems and methods
US12196618B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 2020 |
| Grant date | Jan 14, 2025 |
| Priority date | — |
| Expiry date | Aug 3, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J5/0875
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A passive infrared (PIR) sensor system, includes a PIR sensor configured to produce an output signal in response to receiving infrared (IR) radiation, an electronic shutter positionable in a field of view (FOV) of the PIR sensor, wherein the electronic shutter includes a liquid crystal (LC) material, wherein the electronic shutter includes a first state providing a first transmissivity of IR radiation through the electronic shutter and a second state providing a second transmissivity of IR radiation through the electronic shutter that is less than the first transmissivity, and a shutter actuator configured to apply an actuation signal to the electronic shutter to actuate the electronic shutter between the first state and the second state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.