Patent ID: 7061609

Claim:
Optical wavelength analysis arrangement comprising: entrance selection means ( 4 ) for receiving a light beam ( 3 ) comprising one or more signals each with its own wavelength and for passing at least part of said beam ( 3 ); diffractive means ( 6 , 7 , 9 ) arranged to receive said at least part of said beam ( 3 ) and to diffract each of said signals at an angle dependent on said wavelength; detector means ( 8 ) comprising a plurality of detector elements ( 32 , 33 , 35 , 36 , 38 , 39 ) arranged to receive said diffracted signals and to generate one or more detector output signals in dependence on the diffracted signals; processing means ( 21 ) connected to said detector means for receiving said detector output signals and determining the wavelength of each of said signals characterised in that: said entrance selection means ( 4 ) are arranged for outputting a beam with a spatial uniform intensity distribution; said diffractive means ( 6 , 7 , 9 ) are arranged to diffract each of said signals such that each diffracted signal impinges on a different subset of detector elements, each subset comprising at least a first detector element ( 32 ; 33 ; 35 ; 36 ; 38 ; 39 ) for receiving at least a first signal portion with a first signal portion level; said processing means ( 21 ) are arranged to determine, for each subset the wavelength of the diffracted signal received in dependence on the first signal portion level and a calibration value.