(19)
(11) EP 0 256 651 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
28.02.1990 Bulletin 1990/09

(43) Date of publication A2:
24.02.1988 Bulletin 1988/08

(21) Application number: 87305982.8

(22) Date of filing: 07.07.1987
(51) International Patent Classification (IPC)4: G02B 23/12, G06F 15/66, G08B 13/18
(84) Designated Contracting States:
BE DE FR GB NL

(30) Priority: 04.07.1986 GB 8616330

(71) Applicant: BRITISH AEROSPACE PUBLIC LIMITED COMPANY
Farnborough, Hants. GU14 6YU (GB)

(72) Inventor:
  • Burgess, Oswald
    P.O. Box 5 Filton Bristol, BS12 7QW (GB)

(74) Representative: Rooney, Paul Blaise et al
British Aerospace plc, Corporate Intellectual Property Department, Park East, PO Box 87, Farnborough Aerospace Centre
Farnborough, Hants GU14 6YU
Farnborough, Hants GU14 6YU (GB)


(56) References cited: : 
   
       


    (54) Optical radiation sensitive apparatus


    (57) Infra-red surveillance apparatus adapted to discount short range objects (10). The apparatus comprises two lenses having fields of view with parallel axes (6) and a photo-electric detector (4) positioned behind each lens (3). Comparator means (9) operates so as only to pass signals resulting from an object in the field of view of both lenses.







    Search report