US 12,292,332 B2
Hyperspectral image based on dual-frequency comb
Pedro Martín Mateos, Leganés (ES); Cristina De Dios Fernández, Leganés (ES); Óscar Elías Bonilla Manrique, Leganés (ES); and Guillermo Andrés Guarnizo Herreño, Leganés (ES)
Assigned to UNIVERSIDAD CARLOS III DE MADRID, Leganés (ES)
Appl. No. 17/622,641
Filed by UNIVERSIDAD CARLOS III DE MADRID, Leganés (ES)
PCT Filed Jun. 19, 2020, PCT No. PCT/ES2020/070400
§ 371(c)(1), (2) Date Jun. 24, 2022,
PCT Pub. No. WO2020/260737, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. ES201930582 (ES), filed on Jun. 25, 2019.
Prior Publication US 2022/0364923 A1, Nov. 17, 2022
Int. Cl. G01J 3/45 (2006.01); G01J 3/28 (2006.01); G01J 3/433 (2006.01)
CPC G01J 3/45 (2013.01) [G01J 3/2823 (2013.01); G01J 3/4338 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method for generating an illumination dual-comb signal that provides a train of interferograms readable by a regular video-rate camera comprising N pixels and having a sampling frequency of V Hz to extract hyperspectral information, the method comprising:
providing a monochromatic signal;
splitting the monochromatic signal in two split monochromatic signals;
independently frequency shifting each of the two split monochromatic signals with an offset frequency below

OG Complex Work Unit Math
generating two frequency combs having a difference in repetition frequencies below

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 by independent nonlinear modulation of the two split monochromatic signals;
combining the two generated frequency comb signals to generate the illumination dual-comb signal;
illuminating a target with the illumination dual-comb signal;
employing a video-rate camera to read a train of interferograms based on one or both of a reflected and a transmitted signal of the illumination dual-comb signal at a frequency below

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 Hz; and
performing Fourier transformation of the train of interferograms detected by each pixel from the N pixels to extract the hyperspectral information.