Deep fibre spectroscopy

Details Deep fibre spectroscopy Deep fibre spectroscopy

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1235..702p&link_type=abstract

IN: Instrumentation in astronomy VII; Proceedings of the Meeting, Tucson, AZ, Feb. 13-17, 1990 (A91-29601 11-35). Bellingham, WA

Physics

Optics

8

Astronomical Spectroscopy, Fiber Optics, Optical Fibers, Sky Radiation, Computerized Simulation, Error Analysis, Positioning Devices (Machinery), Signal To Noise Ratios

Scientific paper

Techniques for improving the subtraction of sky background when performing multiobject spectroscopy with fiber-optic-link instruments are examined analytically and by means of numerical simulations. The sky subtraction problems for multislit, long-slit, and fiber-optic spectroscopy are compared; the detrimental effects of fiber misalignment, poor-quality fiber end preparation, stress-related focal-ratio degradation, absorption losses, and connector losses are described; and consideration is given to improvements based on (1) using higher-quality fibers, (2) allowing for wavelength-dependent differences in fiber response, and (3) mimicking the multislit method by allocating more fibers to each object. The effects of vignetting and parameter shifts on computer-simulated spectra are shown in graphs.

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