Patent ID: 6606156
Filing Date: 2003-08-12
Classification: G01J

Abstract:
A spectrometer comprising:a carrier; a light input for measurement light, said light input being disposed on the carrier; a diffraction grating disposed on the carrier for dispersing the measurement light received from the light input; an opto-electronic detector disposed on the carrier for receiving and detecting the measurement light dispersed by the diffraction grating; at least one optical component for imaging the measurement light via the diffraction grating onto the detector; abase board fixedly fastened in a non-movable manner to said carrier for supporting the opto-electronic detector, said opto-electronic detector being fixedly fastened in a non-movable manner at a predetermined position on the base board, said base board and said carrier including positioning members for relatively positioning the base board on the carrier in a predetermined position; wherein the base board is fastened to the carrier at a point P for allowing a thermal expansion of the base board, said point P being selected with respect to a position of the opto-electronic detector on the base board such that the thermal expansion of the base board substantially compensates at least a drift of a spectral light component relative to the opto-electronic detector at at least an intermediate wavelength of a measured spectrum, said drift being a result of a thermal expansion of the diffraction grating and the carrier.