Slit-less spectrometer

A spectrometer arrangement comprising a rigid support member and optical means affixed thereto for defining an optical path between an object plane and an image plane, said arrangement being adapted for receiving an optical fiber including core constituents and having a first end of diameter d, said arrangement including means including an optical fiber coupler cooperative with said fiber for providing at said first end a source of visible radiation of diameter d including spectral components characteristic of said constituents in said object plane, optical means for forming said radiation into a beam of parallel rays, means operative upon said beam to produce a plurality of dispersed chromatically variant images of said source each representative of a different one of said spectral components, (and) detection means for detecting the energy density of each of said images, said detection means having a light-receiving surface of about diameter d located in said image plane and means for moving said light-receiving surface from one of said images to another.