US 12,256,152 B2
System for providing stealthy vision
Santeri Jeremias Seppä, VTT (FI); Teemu Kääriäinen, VTT (FI); and Thomas Fordell, VTT (FI)
Assigned to TEKNOLOGIAN TUTKIMUSKESKUS VTT OY, Espoo (FI)
Appl. No. 17/594,506
Filed by TEKNOLOGIAN TUTKIMUSKESKUS VTT OY, Espoo (FI)
PCT Filed Apr. 22, 2020, PCT No. PCT/FI2020/050262
§ 371(c)(1), (2) Date Oct. 20, 2021,
PCT Pub. No. WO2020/216990, PCT Pub. Date Oct. 29, 2020.
Claims priority of application No. 20195323 (FI), filed on Apr. 23, 2019.
Prior Publication US 2022/0201188 A1, Jun. 23, 2022
Int. Cl. H04N 23/74 (2023.01); F41G 1/35 (2006.01); F41G 1/36 (2006.01); G02B 23/12 (2006.01); G03B 15/02 (2021.01)
CPC H04N 23/74 (2023.01) [G02B 23/12 (2013.01); F41G 1/35 (2013.01); F41G 1/36 (2013.01); G03B 15/02 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A system for providing stealthy vision, comprising:
a source element configured to provide electromagnetic radiation at a predetermined wavelength in order to illuminate a target, wherein the electromagnetic radiation is provided without controlling at least one of temperature or electrical current; and
a camera configured to image the target to be illuminated at the predetermined wavelength; wherein,
the source element is configured to provide electromagnetic radiation comprising shortwave infrared light; and
the predetermined wavelength comprises a wavelength in a region of the near infrared spectrum wherein the absorption features of an atom or a molecule present in a medium through which the electromagnetic radiation propagates form a continuum, that is a wavelength region wherein two or more narrow absorption lines are proximate to each other that they form a single absorption area with a width greater than that of a single absorption line so that the range of the electromagnetic radiation in the medium is limited for all wavelengths within the continuum; and wherein
the region corresponds to a wavelength range centered at 1382.8 nm, 1388.1 nm or 1392.4 nm.