Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975stin...7619410e&link_type=abstract
Optical integration methods for photographic image noise reduction applied to X-ray astronomy Bundesmin. für Forsch. u. Technol.
Astronomy and Astrophysics
Astronomy
Noise Reduction, Optical Data Processing, Rocket-Borne Photography, X Ray Astronomy, Autocorrelation, Average, Cameras, Holography, Matrices, Photographs, Signal Processing, Signal To Noise Ratios, Solar X-Rays
Scientific paper
The principle of improving the signal to noise ratio by averaging signals of the same kind were applied to photographic images. When X-ray sources are imaged with pinholes or zone plates, they are taken simultaneously with a matrix camera. The superposition was obtained by means of a lens matrix or a hologram of the objective matrix of the X-ray camera. The law of reduction of the relative intensity fluctuations in the integrated image was verrified. Autocorrelation functions of film and integrated image were compared. The sun was imaged in the soft X-ray region with a pinhole matrix camera (N=96), borne by a sounding rocket. The image matrix obtained was decoded by both procedures. The dimensions of a pinhole matrix camera for solar X-ray flares to be imaged at lambda = 1.9 angstrom were estimated.
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