The spectrometer has a photodetector (4) for receiving a final radiation beam (FS) and detecting an initial radiation beam based on intensity of the received final beam. An electronic control unit (5) controls detection of the initial beam by the photodetector within a detection cycle, and delivers a read signal (VL) at an end of the detection cycle. The spectrometer is arranged in such a manner that the read signal is equal to a difference between variations of cookie quantity occurring during two initial detection periods. An independent claim is also included for a method for spectral analysis of a radiation beam using a spectrometer.
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