CPC G01J 3/2803 (2013.01) [B64G 1/66 (2013.01); G01J 3/021 (2013.01); G01J 3/0286 (2013.01); G01J 3/18 (2013.01); G01J 5/12 (2013.01); G02B 23/06 (2013.01); G01J 2003/2813 (2013.01)] | 18 Claims |
1. A spectrometer comprising:
an optical assembly including a telescope, a grating and a relay system; and
a focal plane module including a first detector and a second detector,
wherein:
i) the optical assembly is configured to:
receive light from an object or scene through the telescope, thereby focusing the light, receive the focused light by the grating through the relay system; and
split the received light by the grating into a first beam within a first spectral range and a second beam within a second spectral range different from the first spectral range, and
ii) the focal plane module is configured to:
receive the first beam by the first detector to generate a first output signal in correspondence with a spectral content of the first beam, and
receive the second beam by the second detector to generate a second output signal in correspondence with a spectral content of the second beam;
iii) the relay system comprises a first relay with three mirrors, and
iv) the grating is disposed on a secondary mirror of the first relay.
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