Transcript Diapositiva 1

Demetrio Magrin (ciccio punk) and Roberto Ragazzoni
INAF – Astronomical Observatory of Padova
[email protected]
[email protected]
Optical Design Report
Padova, 01/02/2010
Old Baseline
Aspheric
BAF2
Aspheric
BAF2
LF5
BK7
BK7
SF6
200mm
5 mm
378 mm
•
Spectral Range
450 – 1000 nm
•
Entrance Pupil Diameter 120 mm
•
F/#
2.06 @ 700 nm
•
Field of view
28.6 × 28.6 degree2
•
Image quality
90% EE  2×2 pixel2 over 93.4% FoV
•
Plate scale
15 arcsec/pixel
•
Lens glasses
Schott catalogue
RadHard
•
Optical elements < 6.00 Kg
mass
•
Optimized FPA size
•
Detector 2×2 3584×3584 (pixel size 18 micron)
•
Field Distortion
4.52%
132 mm
New Concept
Aspheric
S-FPL51
S-FPL53
SSK5 (G06)
BK7 (G18)
S-BSL7
S-FPL51
210mm
7 mm
378 mm
•
Spectral Range
500 – 1000 nm
•
Entrance Pupil Diameter 120 mm
•
F/#
2.06 @ 700 nm
•
Field of view
28.6 × 28.6 degree2
•
Image quality
90% EE  2×2 pixel2 over 98.0% FoV
•
Plate scale
15 arcsec/pixel
•
Lens glasses
Ohara+Schott RadHard catalogue
•
Optical elements < 7.00 Kg
mass
•
Optimized FPA size
•
Detector 2×2 3584×3584 (pixel size 18 micron)
•
Field Distortion
3.84%
132 mm
2 pixels
4x4 pixels
Reducing the overall weight
Aspheric
S-FPL51
S-SK5(G6)
S-FPL51
S-FPL51 SK4 (G13)
BK7 (G25)
182mm
7 mm
357 mm
•
Spectral Range
500 – 1000 nm
•
Entrance Pupil Diameter 120 mm
•
F/#
2.06 @ 700 nm
•
Field of view
28.6 × 28.6 degree2
•
Image quality
90% EE  2×2 pixel2 over 94.0% FoV
•
Plate scale
15 arcsec/pixel
•
Lens glasses
Ohara+Schott RadHard catalogue
•
Optical elements < 5.00 Kg
mass
•
Optimized FPA size
•
Detector 2×2 3584×3584 (pixel size 18 micron)
•
Field Distortion
3.88%
132 mm
2 pixels
4x4 pixels
Aspheric surface
Vignetting on the first lens
Aspheric
160 mm
7 mm
354 mm
•
Spectral Range
500 – 1000 nm
•
Entrance Pupil Diameter 120 mm
•
F/#
2.06 @ 700 nm
•
Field of view
28.6 × 28.6 degree2
•
Image quality
90% EE  2×2 pixel2 over 94.0% FoV
•
Plate scale
15 arcsec/pixel
•
Lens glasses
Ohara+Schott RadHard catalogue
•
Optical elements < 4.40 Kg
mass
•
Optimized FPA size
•
Detector 2×2 3584×3584 (pixel size 18 micron)
•
Field Distortion
3.88%
132 mm
Aspheric surface
Conclusions
A new design with only one aspheric surface (on the first lens) and without
the use of BaF2 seems feasible by reducing the wavelength range to 5001000 nm.
The optical quality improvement could be sacrificed for:
- reduce the overall weight
- simplify the aspheric surface (if vignetting is allowed)
- improve the focal extraction
- simplify the alignment (to be verified)
- recover the 450-1000 nm spectral band (to be verified)
I’m using both Schott and Ohara radhard glasses. If only one glass
provider is needed, I suggest Ohara (I will try to substitute the Schott
glasses)
Need to define an error budget for the tolerances (from scientific
constraints, i.e. PSF <35 arcsec?)