Electronographic polarimetry - The Durham polarimeter

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Maps, Electronography, Linear Polarization, Optical Polarization, Polarimeters, Image Processing, Instrument Errors, Optical Correction Procedure, Prisms, Telescopes

Scientific paper

The present investigation is concerned with an instrument for mapping the linear polarization of extended astronomical objects at optical wavelengths. The first important studies of this type were based upon the use of photographic techniques and photoelectric observations. Later, improvements in detector technology have made it possible to observe fainter objects at higher spatial resolution. A description is presented of the principles of operation of the Durham University polarimeter which has been extensively used in the observations. The polarimeter uses a 40-mm McMullan electronographic camera to provide simultaneous detection at all the image points. The selected approach provides advantages of increased speed, linearity, resolution, dynamic range, and storage capacity in comparison to photographic detection.

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