CAMESPIR is an optical instrument designed to observe between 1000 nm and 2500 nm.
Imaging shall be possible with both, broad band filters J H K' and narrow J-continuum Pa-beta H-continuum K-continuum band filters, over a Field of View of 6 3arcmin on the sky. This instrument is seeing limited (0.7 arcsecond median seeing as design parameter).
The collimator design is based on the determination of the exit pupil of the optical system. The exit pupil of optical system is an image of aperture diaphragm (the primary mirror telescope) followed by optical elements (lenses). Using this approach we can get the pupil of the telescope with minimal aberration.
The camera consists of six lenses, two of which interaction are doublet for correcting chromatic aberration [4, 5]. All lenses are transparent in spectral range from 1000 to2500 nm. There are no cemented surfaces.
Complete CAMESPIR optical design
Multi Configuration mode was used a in Zemax: Configuration 1 – Full system; Configuration 2 – to keep parallel light direction near of the telescope pupil place; Configuration 3 – for image of the telescope pupil.
Camera Lens with focusing mechanism
The chamber is designed as a separate unit (barrel). Calculations showed that the refocusing optics (replacement filters) must be made within + - 0,15 mm. This movement can be done piezo actuators *. The high demands on the positioning of the first and second lenses cameras are present. As an option should provide additional screws to decenter them in a barrel. But the landing should not be rigid, so the lens does not so the lens did not break during cooled.
* - http://www.noliac.com/Plate_benders-57.aspx
Complete CAMESPIR mechanical design
The complete CAMESPIR mechanical design is presented in the next fig.