(19)
(11) EP 0 953 952 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.12.2000 Bulletin 2000/52

(43) Date of publication A2:
03.11.1999 Bulletin 1999/44

(21) Application number: 99303364.6

(22) Date of filing: 29.04.1999
(51) International Patent Classification (IPC)7: G08B 13/19
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 30.04.1998 GB 9809152

(71) Applicant: Guardall Limited
Newbridge, Edinburgh EH28 8LP, Scotland (GB)

(72) Inventors:
  • Willink, Edward Daniel
    Reading, RG1 3PP (GB)
  • Henness, Alan
    Grangemouth FK3 8BL (GB)
  • Owers, Ian Alexander
    Aberdour, Fife KY3 0TY (GB)
  • McKelvie, Martin James Lister
    Ladywell West, Livingston EH54 6UT (GB)
  • Holme, Roger
    Kirkliston, West Lothian EH29 9LBJ (GB)

(74) Representative: Mosey, Stephen George 
MARKS & CLERK Alpha Tower Suffolk Street Queensway
Birmingham B1 1TT
Birmingham B1 1TT (GB)

   


(54) Electromagnetic radiation sensing device


(57) An electromagnetic radiation sensing device (20) has an n x m array (22) of detecting elements (24) (where n and m are integers greater than unity). These elements (24) are symmetrically arranged about at least one axis, so as to form at least two sub-arrays (26,28). In response to illumination by electromagnetic radiation the sub-arrays (26,28) produce output signals which are substantially equivalent in magnitude and phase.






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