A new form of atmospheric dispersion corrector

Computer Science – Performance

Scientific paper

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Astronomical Spectroscopy, Atmospheric Correction, Image Processing, Spectrographs, Menisci, Optical Correction Procedure

Scientific paper

Earlier proposals for atmospheric dispersion correctors are briefly reviewed, and a new form described consisting of a doublet meniscus lens whose outer surfaces are concentric. The two glasses of the doublet have different dispersions, and the corrector can be tuned for different zenith distance by tipping the meniscus about the common center of its outer surfaces. This new form is simpler than earlier proposals and, in addition, in some applications it can enhance the optical performance by giving better aberration correction and reduced defect of telecentricity. Numerical data and performance figures are provided for one possible embodiment of this device.

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