Patent ID: 9146158
Filing Date: 2015-09-29
Classification: G01J,G02B

Abstract:
1. A four port Michelson interferometer comprising: a first input port viewing a first field of view having spectral radiance and a second input port viewing a second field of view having spectral radiance; and a non-symmetrical single substrate beamsplitter assembly having first and second opposed faces, said non-symmetrical single substrate beamsplitter assembly arranged such that incident spectral radiance from both the first and second input ports are split at said first face of the non-symmetrical single substrate beamsplitter assembly and combined, after traversing separate optical paths, each of said separate optical paths containing a retro-reflector where at least one retro-reflector is movable in order to carry out Fourier transform spectral analysis on said second face of the non-symmetrical single substrate beamsplitter assembly, said Fourier transform spectral analysis comprising: said interferometer performing a direct optical subtractive comparison of the spectral radiance of said second field of view against the spectral radiance of said first field of view having complete absence or self-emitted spectral radiance of the four port interferometer.