Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5492.1290a&link_type=abstract
Ground-based Instrumentation for Astronomy. Edited by Alan F. M. Moorwood and Iye Masanori. Proceedings of the SPIE, Volume 5492
Astronomy and Astrophysics
Astronomy
1
Scientific paper
A spectrograph was designed and constructed to provide a new capability for measuring spectrum of extended emission line sources, but it has the versatility to work well on stellar bright moving sources for example emission nebulae and comets. The spectrograph uses high-speed lens system. It projects the incoming wide field light through a horizontal moving slit assembly onto a reflective grating based on a rotary platform that is synchronised with the slit mechanism. The slit width is adjustable, as is the case in conventional spectrographs. An important part of the design is the lateral movement of the entire slit assembly (in addition to the movement of the slit itself), so that the narrow beam passing through the slit will reflect off different parts of the diffraction grating and be received by the camera in a scanning mode. As a result, this single device can cover a wide field of view across the range of spectra in a short duration of time. In fact it can obtain a spectrum of sky 3 x 3 degrees in a short timescale depending on the quantum efficiency and format size of the CCD detector.
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