Patent ID: 6639681
Filing Date: 2003-10-28
Classification: G01D,G01J,G01K,G01M,G02B

Abstract:
A device for reading spectral lines which are contained in an optical spectrum and are able to fluctuate respectively in given spectral regions, this device comprising:a device for demultiplexing these spectral lines in terms of wavelength, this demultiplexing device having an input intended to receive the optical spectrum and outputs intended to supply respectively the demultiplexed spectral lines; a device for measuring, by filtering, the respective wavelengths of the demultiplexed spectral lines, comprising, for each of these lines, a measuring channel provided with a filter and a reference channel; and means of photodetection, for each spectral line, of the light intensities respectively transmitted by the corresponding measuring and reference channels, so as to be able to determine the wavelength of this line by calculating the ratio of the intensities thus detected.