Patent ID: 6870619
Filing Date: 2005-03-22
Classification: G01J

Abstract:
1. A method of measuring optical radiation with a spectrometer, the method comprising illuminating an entrance slit ( 104 , 204 , 232 , 308 , 500 , 600 ) of the spectrometer with optical radiation; imaging the entrance slit ( dispersing the entrance slit ( modulating the spectrum with the optical modulator, the spectrum being composed into a measurement signal with the dispersive element ( imaging the entrance slit ( dispersing the entrance slit ( reflecting by a first mirror ( modulating the dispersed entrance slit ( reflecting by a second mirror ( directing at least one modulated wavelength band to the dispersive component ( imaging by means of the non-dispersive measurement radiation the entrance slit ( detecting, for spectrum measurement, the measurement radiation obtained from the exit slit ( demodulating the electrical measurement signal to separate signal components formed by different wavelength bands from one another and measuring at least one wavelength band with at least one signal component.