Bibcode
Gracia Témich, Félix; Rasilla, José Luis; Delgado Hernández, José Miguel
Bibliographical reference
Proceedings of the SPIE, Volume 10706, id. 107064V 10 pp. (2018).
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7
2018
Citations
1
Refereed citations
1
Description
The optical instrument used to measure and characterize sky quality at
the IAC observatories is the DIMM (differential image motion
measurements). The optical system and its mode of operation are
relatively simple. It consists, basically, placing two equal apertures
at the entrance of a telescope, in one of them an optical wedge is
located. In this way, two beams of the same object are obtained which
will lead to two on the focal plane of the telescope but laterally
separated a few seconds arc. The complexity of this optical system lies
in the "simplicity" of the plate used to separate the beams, it is a
flat-faced wedge of a few minutes, and this is where problems arise when
manufacturing it. In this paper we present a new optical system concept
to separate the beams. This is done using two optical flats tilted. The
optical flats are not placed at the entrance of the telescope, but in
the convergent beam. The optical design, manufacture and the test
results obtained are presented.