The implications of image scrambling and focal ratio degradation in fibre optics on the design of astronomical instrumentation

Details The implications of image scrambling and focal ratio degradation in fibre optics on the design of astronomical instrumentation The implications of image scrambling and focal ratio degradation in fibre optics on the design of astronomical instrumentation

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...213..502c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 213, no. 1-2, April 1989, p. 502-515. Research supported by SERC.

Physics

Optics

8

Astronomical Spectroscopy, Fiber Optics, Image Processing, Image Analysis, Light Beams, Optical Fibers

Scientific paper

The effects of image scrambling (IS) and focal ratio degradation (FRD) in fiber optic cables on the performance of astronomical instrumentation (such as the Manchester echelle spectrometers) were investigated, for both straight and bent fiber optic cables, on the basis of a literature review on IS and FRD and an experimental study. The investigation includes a comparison of the FRD performance of different 'astronomical' fibers, as a function of bend radius, and an examination of the effects of localized stress on FRD and fiber bending in short fibers; a determination of the effects of diffraction and bends on the amounts of FRD; and a determination of IS properties in short fibers. Results show that FRD is dominated by local stress, while microbends on the scale normally encountered in current instruments do not significantly affect FRD. It was also found that, in short (few cm) fibers, IS is incomplete and that the position of a source on a fiber determines the transmission efficiency.

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