Patent ID: 7277170

Claim:
A device for spectroscopic measurement of the spectrum of a light beam comprising a set of light fluxes each centred over a different wavelength, said device comprising a dispersive element to disperse the set of said light fluxes and an imaging device to detect the light fluxes dispersed, the imaging device comprising line-column matrix of photodetectors with active columns, each of the photodetectors comprising a CMOS-type pixel and the imaging device with active columns being directed so that one wavelength is allocated to a line of photodetectors to enable simultaneous analysis of light fluxes, each centred over a different wavelength and having different light intensities, the device comprising: a means to set an exposure time τ′ i for each sub-matrix M i of the matrix of photodetectors, said sub-matrix M i being associated with a dispersed light flux, τ′ i being the largest integer divider of T smaller than τ i , with T total integration time chosen by the user, and τ i the exposure time necessary to measure a maximal intensity I max of said considered flux, wherein flux i is greater than or equal to 1.