US 11,719,576 B2
Mid-wave and long-wave infrared point spectrometer
William R Johnson, Pasadena, CA (US); Matthew E Kenyon, Pasadena, CA (US); Jordana Blacksberg, La Canada, CA (US); Carol A Raymond, Pasadena, CA (US); Bethany L Ehlmann, Pasadena, CA (US); and Xiangwen Chen, Pasadena, CA (US)
Assigned to CALIFORNIA INSTITUTE OF TECHNOLOGY, Pasadena, CA (US)
Filed by California Institute of Technology, Pasadena, CA (US)
Filed on Oct. 28, 2020, as Appl. No. 17/83,165.
Claims priority of provisional application 62/929,628, filed on Nov. 1, 2019.
Prior Publication US 2021/0131872 A1, May 6, 2021
Int. Cl. G01J 3/28 (2006.01); G01J 3/02 (2006.01); G01J 3/18 (2006.01); B64G 1/66 (2006.01); G02B 23/06 (2006.01); G01J 5/12 (2006.01)
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
OG exemplary drawing
 
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.