Intrusion detection system with a segmented radiation sensing mirror
US4263585A · kind A · utility
Inventor
Key dates
| Filing date | Aug 13, 1979 |
| Grant date | Apr 21, 1981 |
| Priority date | — |
| Expiry date | Aug 13, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S250/01
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An intrusion detection system has an optical device for focusing radiation energy onto radiation sensing elements. Connected to the sensing elements is a circuit which produces intrusion signals from detected radiation energy for controlling the operation of an alarm. The optical device has a sensing mirror with a concave reflective surface that comprises a plurality of pairs of vertically disposed contiguous reflective segments. The reflective segments of the sensing mirror have the same vertical curvature, but the pairs of reflective segments differ from one another in horizontal curvature, in the area of reflective surface and in the horizontal focal lengths. The reflective segments of the sensing mirror will reflect radiation energy from a wide range of angles offset from the direction of the center line of the optical device and project the radiation energy onto a focusing mirror, which, in turn, casts the radiation energy onto the sensing elements. The cluster of sensing elements is disposed along the center line of the sensing mirror.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.