Bibcode
Sánchez-Capuchino, J.; Hernández, E.; Bueno, A.; Herreros, J. M.; Thatte, N.; Bryson, I.; Clarke, F.; Tecza, M.
Referencia bibliográfica
Proceedings of the SPIE, Volume 9147, id. 91479J 13 pp. (2014).
Advertised on:
7
2014
Número de citas
1
Número de citas referidas
0
Descripción
HARMONI is a visible and near-infrared (0.47μm to 2.5μm) integral
field spectrometer providing the E-ELT's core spectroscopic capability.
It will provide ~32000 simultaneous spectra of a rectangular field of
view at four foreseen different spatial sample (spaxel) scales. The
HARMONI fore-optics re-formats the native telescope plate scale to
suitable values for the downstream instrument optics. This telecentric
adaptation includes anamorphic magnification of the plate scale to
optimize the performance of the IFU, which contains the image slicer,
and their four spectrographs. In addition, it provides an image of the
telescope pupil to assemble a cold stop shared among all the scales
allowing efficient suppression of the thermal background. A pupil
imaging unit also re-images the pupil cold stop onto the image slicer to
check the relative alignment between the E-ELT and HARMONI pupils. The
scale changer will also host the filter wheel with the long-pass filters
to select the wavelength range. The main reasoning specifying the
importance of the HARMONI fore-optics and its current optical and
mechanical design is described in this contribution.