Reivindicaciones

1. A method for generating a illumination dual-comb signal that provides a low frequency train of interferograms (180) readable by a regular video-rate camera (160) comprising N pixels and a sampling frequency of V Hz to extract hyperspectral information (170), the method comprising: providing a monochromatic signal; splitting the monochromatic signal in two split monochromatic signals; frequency shifting each monochromatic signal with an offset frequency below V 2 <img class="EMIRef" id="e4105d54-37c0-4518-9a07-df4d58a30d41-ib0005" /> Hz; generating two frequency combs having a difference in repetition frequencies below V 2 <img class="EMIRef" id="e4105d54-37c0-4518-9a07-df4d58a30d41-ib0006" /> Hz by a 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; and employing a video-rate camera (160) to read a low frequency train of interferograms (180) based on a reflected and/or transmitted signal of the illumination dual-comb signal; and performing Fourier transformation of the low frequency train of interferograms (180) detected by each pixel from the N pixels to extract the hyperspectral information (170). 2. The method for generating a dual-comb signal according to claim 1, further comprses shifting the illumination dual-comb signal to wavelength ranges including the visible, the mid-IR and the terahertz ranges. 3. The method for generating a dual-comb signal according any of the preceding claims, wherein performing frequency shifting comprises shifting each signal at a 40 MHz having a frequency offset of 5Hz . 4. The method for generating a dual-comb signal according to any of the preceding claims, wherein performing nonlinear modulation comprises using single or an arrangement of intensity or phase modulators. 5. A system for generating a dual-comb signal that provides a low frequency train of interferograms (180) readable by a regular video-rate camera (160) to extract hyperspectral information (170), the system comprising: a laser (110) providing a monochromatic signal; a first splitter (105a) to split the monochromatic signal into two split signals; a first acousto-optic modulator (120a) and a first phase modulator (130a) to perform a frequency shift and the nonlinear modulation of a first split signal; a second acousto-optic modulator (120b) and a second phase modulator (130b) to perform a frequency shift and the nonlinear modulation of a second split signal; a second splitter (115b) to combine the first and second modulated split signals to obtain the dual-comb signal.