Jobin Yvon Sas

Catherine Wallerand

Emmanuel Fretel

Yves Danthez

Arshad Mirza

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 &#x3c4;necessary to measure a maximal intensity Iand the sub-matrix Mof photodetectors associated with the light fluxes, allocating to the sub-matrix Mof photodetectors an exposure time &#x3c4;'so that &#x3c4;&#x2032;is the largest integer divider of the total integration time T smaller than &#x3c4;, measuring and resetting, during the integration time T of said spectrum, at each time &#x3c4;&#x2032;, the corresponding sub-matrix Mindependently of the other sub-matrices Mwith j&#x2260;i, and measuring the spectrum of the beam at the time T.

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Massy, France

Catherine Wallerand