Method and apparatus for detecting the presence of an object
US6384414B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1998 |
| Grant date | May 7, 2002 |
| Priority date | — |
| Expiry date | Nov 25, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S250/01
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for detecting and classifying an object, including a human intruder. The apparatus includes one or more passive thermal radiation sensors that generate a plurality of signals responsive to thermal radiation. A calculation circuit compares the plurality of signals to a threshold condition and outputs an alarm signal when the threshold condition is met, indicating the presence of the object. The method includes detecting thermal radiation from an object at a first and second wavelength and generating a first and second responsive signal. The signals are compared to a threshold condition that indicates whether the object is an intruder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.