US 12,474,430 B2
Detection device, system and method for determination of incidence angle of an optical beam
Julijanas Zeludevicius, Vilnius (LT); and Giedrius Dubosas, Vilnius (LT)
Assigned to Valstybinis moksliniu tyrimu institutas Fiziniu ir technologijos mokslu centras, Vilnius (LT)
Filed by Valstybinis moksliniu tyrimu institutas Fiziniu ir technologijos mokslu centras, Vilnius (LT)
Filed on May 19, 2023, as Appl. No. 18/199,488.
Prior Publication US 2023/0375337 A1, Nov. 23, 2023
Int. Cl. G01S 3/783 (2006.01); G01B 11/27 (2006.01); G01S 3/78 (2006.01)
CPC G01S 3/783 (2013.01) [G01B 11/272 (2013.01); G01S 3/7803 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A detection device for determination determining an angle of incidence of an optical beam when an optical spectrum of the optical beam is predefined and constant, comprising:
at least two detectors of optical power, and
at least one optical interference filter (OIF) placed in a path of the optical beam,
wherein optical transmission of the at least one OIF depends on an incidence angle of the optical beam to a surface of the at least one OIF,
wherein the angle of incidence with respect to an optical axis of the detection device is determined by comparison of the optical power of the optical beams,
wherein a first OIF and a second OIF of the at least one OIF is/are rotated by a predefined angle with respect to the optical axis of the detection device in a detection plane,
wherein the incidence angle of the optical beam, with respect to the optical axis of the detection device is determined by comparing optical power of the optical beam(s), which is/are transmitted through the at least one OIF and/or reflected from the at least one OIF, and
wherein a receiver detector is positioned directly after the second OIF along the optical axis to receive the optical beam transmitted through the second OIF.