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Abstract

A device and a method for spectroscopic measurement of the spectrum of a light beam. The method includes detecting the dispersed light fluxes of the beam on an imaging device comprising a matrix of photodetectors with active columns, directing the imaging device so that one wavelength is allocated to a line of photodetectors, determining for each light flux the exposure time .tau..sub.i necessary to measure a maximal intensity I.sub.max and the sub-matrix M.sub.i of photodetectors associated with the light fluxes, allocating to the sub-matrix M.sub.i of photodetectors an exposure time .tau.'.sub.i so that .tau.'.sub.i is the largest integer divider of the total integration time T smaller than .tau..sub.i, measuring and resetting, during the integration time T of said spectrum, at each time .tau.'.sub.i, the corresponding sub-matrix M.sub.i independently of the other sub-matrices M.sub.j with j.noteq.i, and measuring the spectrum of the beam at the time T.

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First Claim