Motion detection
US9255786B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 29, 2015 |
| Grant date | Feb 9, 2016 |
| Priority date | — |
| Expiry date | Jun 19, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2005/345
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A motion sensor has at least two tiers of monitored volumes that are offset from each other. Electromagnetic radiation, such as infrared light, is directed from the monitored volumes onto at least two sets of detector elements having separate outputs on a pyroelectric substrate of an infrared detector. As a warm object, such as a human or an animal, moves through the monitored volumes, the warmth from the object causes the voltage on the outputs of the infrared detector to change. The resultant waveforms are compared and if the two waveforms have a phase relationship corresponding to a critical phase angle that is based on the pitch of the monitored volumes and the offset between the tiers of monitored volumes, an animal-immune motion indication is generated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.