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Demetrio Magrin INAF – Astronomical Observatory of Padova demetrio.magrin@oapd.inaf.it. Optical Design Catania, 11/06/2014. Outlines. Design parameters (Definition phase) Nominal Baseline (Definition phase) Nominal Performances (EE, spot diagram, PSFs, vignetting factor)

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demetrio magrin inaf astronomical observatory of padova demetrio magrin@oapd inaf it
Demetrio Magrin

INAF – Astronomical Observatory of Padova

demetrio.magrin@oapd.inaf.it

Optical Design

Catania, 11/06/2014

outlines
Outlines

Design parameters (Definition phase)

Nominal Baseline (Definition phase)

Nominal Performances (EE, spot diagram, PSFs, vignetting factor)

Sensitivity and thermal analysis

Breadboard – Prototype

New (Last…) Baseline

Open Issues

nominal design definition phase 18 03 2011

BK7 (G18)

BK7

S-FPL51

N-KZFS11

KZFSN5

S-FPL53

CaF2

196.2 mm

368 mm

Nominal DesignDefinition phase (18/03/2011)
aspheric surface s fpl51
Aspheric surface S-FPL51

Maximum deviation from BFS

 1.050 mm

See R.Ragazzoni presentation

enclosed energy
Enclosed Energy

G0V + detector QE

2x2 pixels

spot diagrams and fov
Spot diagrams and FoV

13.6 deg, 13.6 deg

4x4 pixels

14.3 deg, 14.3 deg

about vignetting
About vignetting

Natural vignetting

9.0% at the edge of the full FoV

7.5% at the edge of the ‘in spec’ FoV

about vignetting1
About vignetting

Mechanical vignetting

6.4% at the edge of the full FoV

4.2% at the edge of the ‘in spec’ FoV

about vignetting2
About vignetting

Natural + Mechanical vignetting

15.4% at the edge of the full FoV

11.7% at the edge of the ‘in spec’ FoV

sensitivity analysis
Sensitivity Analysis

Optical elements defocus  30-50 micron

Merit Function: 80%EE< 2×2 pixel2 over the corrected FoV

thermal analysis
Thermal Analysis
  • In the case of the of a uniform change of the temperature the optical system has 2 C of tolerances without the need of refocusing. With a temperature change of 10 C the nominal performances are still recoverable by applying a defocus through the three resistors.
  • In the case of temperature gradient around the nominal temperature, the optical system maintain the nominal performance with a T=5 C without the need of refocusing. While the performances are recoverable by applying a defocus in the case of a T=10 C.
breadboard prototype design
BreadBoard/Prototype Design

The baseline design has been modified to allow the SESO tools adaptation (surfaces curvatures) and to facilitate and to speed up the manufacturing and mounting processes (some thicknesses and apertures have been increased). For procurement reasons, the glass of L5, KZFSN5, has been substituted by N-KZFS5.

(J.Farinato / V.Viotto / M.Bergomi presentations)

my last new baseline 21 05 2011
My last ‘New Baseline’… 21/05/2011
  • A physical stop in front of L3 (at about 2.84 mm edge to edge).
  • New weights for the wavelengths used in the Zemax merit function provided by P. Levacher - P. Bernardi.
  • Change the glass of L5 from KZFSN5 to N-KZFS5 (almost no optical impact and facilitate the procurement).
  • Change the thicknesses of L5 and L6 from 5mm to 7mm (all the industries suggested to increase these numbers).
  • Change on all lenses apertures from 1mm to 2mm with respect to the clear aperture. It should help to minimize the mechanical vignetting.
open issues
Open Issues
  • Data mining… (about 3 years to resurrect).
  • Converge on a well-identified design to use as baseline.
  • Optimize the design for new/modified requirements.

Plate scale, PSF size, window material and thickness, 2 F-TOUs dedicated design.

  • Perform a detailed manufacturing/alignment tolerances and consolidate sensitivity/thermal analysis.

RUAG warnings: the design is tight/ de-spacing tolerances are sub-micron.

  • Double-check performances in terms of EE/Simulator
  • Contact SESO and discuss the upgrade from breadboard to prototype with the related implications.