Abstract
The light source is housed in an Ulbricht-sphere with circular ring shaped openings (ring-slits), through which a pair of Fabry-Perot-plates is illuminated. Variation of the collimator focal length, with the radii of the ring-slits kept unchanged, causes a change of the angles under which the plates are irradiated, and thus a variation in the wavelength passed by the plates is obtained. In this way a spectral range of 16 A can be scanned with a resolution of 2 A. Additionally, changing the plate separation by a simple mechanical device enables the setting of the above mentioned range within a spectral region 1,000 A wide, without readjustment or loss of resolution. The magnitude of (slit area) × (collimator spherical angle) × transmission amounts to 2 × 10−2 cm2 at maximum transmission. Besides, for the case of a multitude of circular ring openings the best possible transmission curve is discussed.
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