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Sample: Prism Spectrograph 2
VOB Virtual Optical Bench Program Series
A typical line spectrum of a
prism spectrograph
can be produced by image synthesis. The entrance slit is simulated by a bitmap
(Fig 3-5a) at the object plane of the system. The resulting spectrum is shown
in figure 3-5b and the corresponding energy spectrum in figure 3-5c.
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Fig. 3-5a: Bitmap of entrance slit of prism spectrograph (object)
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Fig. 3-5b: Image of entrance slit of prism spectrograph (false colors)
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Fig. 3-5b: Energy spectrum
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The upper example (Fig 3-5) is made disregarding the features of the detector.
VOB++ and VOB pro obtain electro-optical features. Several detector and scanner
types (electronical and mechanical) can be simulated. In fig. 3-6 a matrix
detector is shown, like a CCD array used in TV cameras. Due to the
comparatively coarse matrix the resulting spectrum (Fig. 3-7b, c) shows typical
structures, which affect the resolution of the spectrograph.
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Fig. 3-6: Image of matrix detector with diode size of 0.10 * 0.10 and center to
center distance of 0.15 * 0.15 (arbitrary units)
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Fig. 3-7a: Bitmap of entrance slit of prism spectrograph (object)
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Fig. 3-7b: Image of entrance slit of prism spectrograph as sampled by matrix
detector of Fig. 3-6 (false colors)
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Fig. 3-7b: Energy spectrum as sampled by matrix detector of Fig. 3-6
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