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AssigneeBruker Analytische MeBtechnik GmbH
InventorsJurgen Gast, Arno Simon, Eckhard Reh
Estimating the term…
A sample holder for placing a sample substance for transmission measurements with optical radiation into a spectrometer, in particular, a FTIR spectrometer which is at least partially made from a material transparent to the optical radiation in a intermeshing wavelength region and which exhibits an index of refraction in excess of 1 is configured as a converging lens with a concave surface (11) and a convex surface (12). To take an absorption spectrum of a powder and/or fluid dissolved or suspended sample substance, the sample substance is brought onto the concave surface (11) of the sample holder before the measurement where it, in consequence of the curvature and in contrast to a flat surface, is concentrated in a substantially smaller surface region. The configuration of the sample holder as a converging lens increases the yield of the radiation penetrating through the sample substance onto the detector of the spectrometer configuration.
Sample holder for the introduction of a sample substance for transmission measurements with optical radiation in a spectrometer, said sample holder having an optical axis and comprising a converging lens having means defining a concave surface, with a radius of curvature R, for receiving the sample substance and means defining a convex surface, with a radius of curvature r, for refracting the optical radiation passing through the sample substance and the concave surface toward the optical axis such that the optical radiation becomes less divergent or parallel, said sample holder being formed, at least in part, from a material transparent to the optical radiation and having an index of refraction in excess of 1 and the convex radius of curvature r is less than the concave radius of curvature R.
Method for taking an absorption spectrum of a sample substance through transmission measurements with optical radiation in a spectrometer with an optical detector comprising the steps of introducing the sample substance onto a concave surface of a sample holder having an optical axis and which is at least partially transparent to the optical radiation in an interesting wavelength region, introducing the sample holder into an optical path of the spectrometer in such a way that the sample holder concave surface carrying the sample substance is essentially perpendicular to the optical path thereof and faces away from the detector and refracting optical radiation passing through the sample holder with a convex surface on said sample holder towards the sample holder optical axis.
Dependencies are inferred from the claim text.