Derivation of photographic characteristic curves with a birefringent calibration device

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Photography, Astronomical Photometry, Calibrating, Image Processing, Birefringence, Image Filters, Photographic Emulsions

Scientific paper

The accuracy of photographic photometry is critically dependent upon the procedures used for photometric calibration. A simple procedure for the photometric calibration of photographic plates using of a Lyot filter is described. Having just two entrance slits, the Lyot filter element utilized the birefringence of a quartz plate in conjunction with polarizers to produce a spectrum whose intensity varies quasi-sinusoidally as a function of wavelength.

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