An optical spectrometer and a method for spectrally resolved two-dimensional imaging of an object

An optical spectrometer for spectrally resolved two-dimensional imaging of an object, comprising:

• a lens assembly for collimating incoming radiation from an object arranged along an optical axis, comprising:
• a first lens arranged on the optical axis of the lens assembly;
• a second lens arranged on the optical axis of the lens assembly;
• a light filter comprising a non-transparent sheet body with at least one hole;
• wherein the light filter is arranged:
• between the first lens and the second lens;
• in the focal point of the first lens and the second lens;
• and
• so that the at least one hole is close to or at the optical axis of the lens assembly;
• wherein the optical spectrometer further comprises:
• a dispersing device placed after the lens assembly on the optical axis;
• a multi-lens array arrangement arranged in one plane and arranged to receive the dispersed radiation from the dispersing device;
• and
• a two-dimensional detector arranged to receive the dispersed radiation as directed by the multi-lens array arrangement and located adjacent to the focus of each lens of the multi-lens array arrangement.