Patent EP0214795A1 successfully refreshed from Google Patents.
EP0274889A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Security sensors
Assignee: KGS Fire & Security UK Ltd
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Filing: 1987-12-17
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Granted: —
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Expires: 2007-12-17
Abstract
Abstract An intruder sensor contains a microwave detector (14, 16, 18) and a passive infra-red detector (8, 10) in the same housing (2). A panel (4) in the housing defines a series of Fresnel lens segments (6) which define the zones for the infra-red sensitive element (8). The panel (4) also forms the radome for the microwave detector. In the twin horn microwave detector, the infra-red sensitive element (8) is mounted on a circuit board between the horns (14, 16).
Inventors
- 👤 John Lindsay Galloway
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 08:10
CPC Classifications
G; G08; G08B; G08B29/00; G08B29/18; G08B29/183; G08B13/00; G08B13/18; G08B13/189; G08B13/19; G08B13/22; G08B13/24; G08B13/2491; G08B13/2494; Y; Y10; Y10S; Y10S250/00; Y10S250/01
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
150 words
A security sensor comprising a housing (2) containing a passive infra-red detector and a microwave detector, said passive infra-red detector comprising at least one infra-red sensitive element (8), a window in said housing (2), an optical arrangement for directing infra-red radiation received through the window onto said element (8), and a processing circuit (10) connected to the output of said element (8), said microwave detector comprising a radome in said housing (2), means (14, 16) for transmitting microwaves through said radome and receiving microwaves reflected back from a target through said radome, and a processing circuit (18) connected to said receiver, characterised in that a panel (4) is provided in said housing (2), which panel (4) is shaped to define at least one Fresnel lens segment (6), the panel (4) serving as said optical arrangement and said window of the infra-red detector, and as the radome of said microwave detector.
Claim 2
Dependent Claim
150 words
A security sensor comprising a housing (2) containing a passive infra-red detector and a microwave detector, said passive infra-red detector comprising at least one infra-red sensitive element (8), a window in said housing (2), an optical arrangement for directing infra-red radiation received through the window onto said element (8), and a processing circuit (10) connected to the output of said element (8), said microwave detector comprising a radome in said housing (2), means (14, 16) for transmitting microwaves through said radome and receiving microwaves reflected back from a target through said radome, and a processing circuit (18) connected to said receiver, characterised in that a panel (4) is provided in said housing (2), which panel (4) is shaped to define at least one Fresnel lens segment (6), the panel (4) serving as said optical arrangement and said window of the infra-red detector, and as the radome of said microwave detector.
Claim 3
Dependent Claim
40 words
A sensor according to claim 1, wherein said microwave transmitting and receiving means comprise a transmitting cavity and a receiving cavity each having a respective horn (14, 16), said infra-red sensitive element (8) being mounted between said horns (14, 16).
Claim 4
Dependent Claim
27 words
A sensor according to claim 1, wherein said microwave transmitting and receiving means comprises a transmitting cavity and a receiving cavity which share a common flared horn.
Claim 5
Dependent Claim
19 words
A sensor according to claim 1, wherein the sensor is inset into a wall of the common flared horn.
Claim 6
Dependent Claim
17 words
A sensor according to any one of the preceding claims, wherein the panel is high density polyethylene.
References Cited (Backward Citations)
No citation records indexed.
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