US 11,852,804 B2
Scan mirror reflectivity calibration method and apparatus
Lacy G. Cook, El Segundo, CA (US)
Assigned to Raytheon Company, Tewksbury, MA (US)
Filed by Raytheon Company, Waltham, MA (US)
Filed on Mar. 26, 2021, as Appl. No. 17/214,692.
Prior Publication US 2022/0308337 A1, Sep. 29, 2022
Int. Cl. G02B 26/10 (2006.01); G01N 21/55 (2014.01); G02B 26/08 (2006.01)
CPC G02B 26/10 (2013.01) [G01N 21/55 (2013.01); G02B 26/0816 (2013.01); G01N 2201/0683 (2013.01)] 26 Claims
OG exemplary drawing
 
1. A scan mirror reflectivity calibration device for monitoring and facilitating calibration of a rotating two-sided scan mirror comprising:
a housing in support of the two-sided scan mirror;
at least one light source assembly operable to direct light onto a back side of a rotating two-sided scan mirror, wherein each side of the two-sided scan mirror rotates from an outside facing orientation, facing away from the housing to receive light from outside of the housing, to an inside facing orientation, facing towards the housing, such that each side alternates from a front side at the outside facing orientation to the back side at the inside facing orientation, and wherein rotation of the rotating two-sided scan mirror defines a swept volume of the rotating two-sided scan mirror, the at least one light source assembly being mounted outside the swept volume of the rotating two-sided scan mirror; and
at least one detector assembly aligned with the at least one light source assembly, and operable to detect light that is emitted from the at least one light source assembly and reflected off of the back side of the rotating two-sided scan mirror, the at least one detector assembly being mounted outside the swept volume of the rotating two-sided scan mirror.