Spectrometer for VNIR spectrometry

Abstract

A spectrometer is disclosed, comprising: a light source configured to receive light from a scene; a diffraction grating configured to receive a light beam from the light source and to disperse the light beam to form a dispersed light beam, the diffraction grating comprising an axis of normal incidence and a plurality of grooves, these defining a plane that includes the axis of normal incidence and which is normal to the grooves; a detector configured to detect the dispersed light beam; wherein the angle of incidence, between the light beam and the axis of normal incidence in the plane, is 5 to 8 degrees, and the out-of-plane angle, between the light beam and the axis of normal incidence outside the plane is 1.5 to 4 degrees. A correcting lens may be provided, disposed between the diffraction grating and the detector.

Dependencies are inferred from the claim text.