Motion detection sensor with computer interface
US5281961A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 21, 1992 |
| Grant date | Jan 25, 1994 |
| Priority date | — |
| Expiry date | Jan 21, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A ceiling sensor designed to interface with the computerized controllers of energy management systems is disclosed. This ceiling sensor is operable to detect motion through the use of a transmitted signal of predetermined frequency which when received has experienced a Doppler shift. Comparison of the received signal with its frequency change to the transmitted signal produces motion detection which when incorporated with an isolated latching relay enables the switching on and off of light, heating, air conditioning or security interfaces. A ceiling sensor is disclosed which is operable to detect the short, quick movements of employees working in a narrow range field of view such as a shop aisle or warehouse corridor. A second ceiling sensor is disclosed which is operable to detect the gross, large movements of employees in a large area such as an open room or warehouse. A method of fabricating a ceiling sensor for a computer controller interface is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.