FOURIER TRANSFORM SPECTROMETER USING AN OPTICAL BLOCK

摘要

The invention concerns an interferometric optical block for Fourier Transform spectrometers having three planar nominally surfaces (1, 2, BS/C) with the two outer surfaces (1, 2) adapted to act as beam reflectors for internal light and the third surface (BS/C) in operation acting as a beam splitter and beam combiner, the optical block having an input portion by means of which an input beam (3) of light to be analysed can be input so as partially to pass through said third surface (BS/C) to be internally reflected by one of said outer reflectors, and partially to be reflected by said third surface (BS/C) so as then to be internally reflected by the other of said outer reflectors whereby light internally reflected by said outer reflectors is combined at said third surface (BS/C) to produce an exit beam, and wherein said outer surfaces (1, 2) have an inclination with respect to one another so as to make a variation in path lengths in the light forming the exit beam so as to generate an interference fringe field.