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- W45761799 abstract "The new NPL reference spectrophotometer uses reflecting optics and a grating-double monochromator. These will allow it to be used from 200 nm to 4000 nm. The input optics comprise the light source (a deuterium and a tungsten ribbon lamp), focussing mirror, second order wavelength blocking filters and a chopper for IR work. Off-axis parabolic mirrors are used in the measurement beam (four of them if a focussed beam is used) with beam defining apertures, shutter, sheet polaroid and linearity measuring system. For the visible and UV the detector is a photomultiplier (S20 cathode) behind a 100 mm diameter, barium sulphate coated, integrating sphere. The monochromator exit aperture has a working range of 2.0 to 0.1 mm in width and 10 to 1 mm in height. For work of the highest accuracy the beam has to be parallel and the aperture 1 × 1 mm or smaller. The maximum beam size is 30 mm, square or circular. In the visible the total uncertainty can be as good as 10-4 of the value but is limited by the sample quality. The largest correction (< 0.03 %) is from the photomultiplier nonlinearity. Measurements can be extended to 1000 nm with silicon detectors and 1600 nm with germanium. Lead sulphide detectors are being investigated for use out to 2500 nm." @default.
- W45761799 created "2016-06-24" @default.
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- W45761799 date "1987-01-01" @default.
- W45761799 modified "2023-09-23" @default.
- W45761799 title "The New Automated Reference Spectrophotometer at Npl" @default.
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- W45761799 doi "https://doi.org/10.1016/b978-0-444-42880-6.50008-8" @default.
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