Patent ID: 6573989
Filing Date: 2003-06-03
Classification: G01J

Abstract:
A spectrometer for measuring a spectrum of a light beam supplied from a light source, said spectrometer comprising:collimating means for changing a light beam supplied from a light source into a parallel light beam; first diffraction means for diffracting a specified wavelength component included in the parallel light beam into a predetermined direction; second diffraction means, which is operable to be moved between a first position and a second position at least, for diffracting the parallel light beam output from said first diffraction means toward said first diffraction means so that the parallel light beam goes and returns K times, where K represents a natural number, between said first diffraction means and said second diffraction means; detection means for detecting the parallel light beam output from said first diffraction means, which has gone and returned K times between said first diffraction means and said second diffraction means; and control means for changing a value of K by moving said second diffraction means from one of the first position and the second position to the other at least.