Method and Fourier Transformation spectrometer with double beam interferometer for Single Shot Imaging Fourier Spectroscopy

A Fourier Transformation Spectrometer (FT spectrometer), comprising:

• a double beam interferometer, comprising:
• at least one beam splitter unit for splitting an incident light beam of a spatially expanded object into a first partial beam and a second partial beam;
• at least one first beam deflection unit designed to deflect the first partial beam at least a first and a second time, wherein
• the first beam deflection unit is designed to also deflect the second partial beam at least a first and a second time;
• or
• the double beam interferometer comprises a second beam deflection unit designed to deflect the second partial beam at least a first and a second time,
• wherein the beam splitter unit is also designed to spatially at least partially overlay the first partial beam and the second partial beam, and wherein the respectively first and second deflection of the first partial beam and the second partial beam generates the lateral shear(s);
• at least one first field of view discriminator unit arranged such that the first partial beam is spatially selected after the splitting and before the second deflection;
• at least one second field of view discriminator unit arranged such that the second partial beam is spatially selected after the splitting and before the second deflection;
• wherein the FT spectrometer additionally comprises:
• at least one lens arranged opposite the beam splitter unit such that the incident light beam passes the lens at least partially before said light beam is split on the beam splitter unit and the first partial beam and the second partial beam respectively generate a plurality of coherent image points of the spatially expanded object in an image plane between the beam splitter unit and a detector;
• the detector to record a plurality of spatial interferograms on the basis of the spatial overlay of the first partial beam and the second partial beam, which corresponds to the at least partial imaging of the plurality of coherent image points;
• and
• at least one computing unit for the Fourier transformation of the plurality of spatial interferograms to generate a plurality of spectrums, and based thereon, to generate a hyperspectral image of the spatially expanded object.