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Progress meeting 4, 27.01.2006 Calibration Unit status at PM4 Andreas Kelz, Svend M. Bauer Uwe Laux, Martin M. Roth.

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Presentation on theme: "Progress meeting 4, 27.01.2006 Calibration Unit status at PM4 Andreas Kelz, Svend M. Bauer Uwe Laux, Martin M. Roth."— Presentation transcript:

1 Progress meeting 4, Calibration Unit status at PM4 Andreas Kelz, Svend M. Bauer Uwe Laux, Martin M. Roth

2 , PM4.2 CU product tree CONT & ARC Lamps, filters & shutters Integrating sphere & lens to mimic VLT pupil & beam various calibration masks PE + ICE (AIP + LAOMP)

3 , PM4.3 CU Requirements Functional and performance requirementsFunctional and performance requirements: Flat field calibrationFlat field calibration Spectral calibrationSpectral calibration Image quality calibrationImage quality calibration Geometrical calibrationGeometrical calibration Light contaminationLight contamination Operational requirementsOperational requirements: Natural imposed environmentNatural imposed environment Operating modesOperating modes Lifetime requirementsLifetime requirements Reliability / Safety requirementsReliability / Safety requirements Maintenance / Interchangeability requirementsMaintenance / Interchangeability requirements Interface requirementsInterface requirements: Mechanical and thermal interfacesMechanical and thermal interfaces Electrical, communication and fluid interfacesElectrical, communication and fluid interfaces Optical interfacesOptical interfaces Software interfaces for details see: CU Technical Specifications Version: 2.3 from: 26/04/2005 VLT-SPE-MUS

4 , PM4.4 VLT beam CU beam CU concept CU concept Calibration optics focal plane virtual lens pupil plane

5 , PM4.5 CU basics – CU optics to replace and to simulate the VLT – One calibration relay lens (CRL) to mimic VLT beam (using a telescope objective). – An integrating sphere for homogenous illumination (to simulate flatfield screen). – Various calibration light sources (CLS) for white light and spectral illumination. -Precision masks at CU focal plane to calibrate instrument and to measure image quality.

6 , PM mm80 mm 1200 mm1108 mm Top: VLT beam Bottom: CU beam (D=80mm, F=1200mm) Integrating Sphere (IS) = pupil plane Calibration Relay Lens (CRL) CU Focal Plane (CFP) CU design (Apochromat triplet K5 / CaF2 / K5)

7 , PM nm 436 nm 707 nm 480 nm 644 nm pupil polychrom. VLT – focal plane spot diagramms on-axis off-axis -> 0.03mm

8 , PM nm 436 nm 707 nm 480 nm 644 nm pupil polychrom. CRL – Apochromat (CaF2) spot diagramms on-axis off-axis -> 0.15 mm VLT Airy disk

9 , PM4.9 CU with mechanics

10 , PM4.10 CU dimensions 1.3 m 1.6 m ca. 80 kg

11 , PM4.11 CLS – IS - CRL Lamps and Proximity Electronic in individual housings Flexible Light Guides to connect lamps to CU Integrating Sphere for homogenous illumionation Stray light baffles Calibration optics to mimic telescope

12 , PM4.12 i.e. 6 lamps: Continuum Flat: Quartz halogen Arc lamps (pencil style): Hg, Ar, Ne, Kr Arc lamps (High Power): He, K, Cs, Cd, Rb, Hg Hollow cathode lamps: Th/Ar Fe/Ar/He Calibration Light Sources & PE boxes

13 , PM4.13 CMW-CPE CU inner components: Calibration Mask Wheel and Pick-up Element

14 , PM4.14 Pinhole mask MUSE pinhole mask: ~800 pinholes, 20 micron at 35x35 mm Precison and pitch Tolerance: +/- 1 micron Laser-manufactured (LMTB) mask: 1024 pinholes, 12 microns each at 1x1 mm

15 , PM4.15 B3110 Calibration Unit opto-mechanical design – Location of CU on Nasmyth platform TBD – Removability of CU for GALACSI dismounting – Location of lamps and distance from CU to electronic cabinets CU: TBD – open issues

16 , PM4.16 – CU optical design document: due at 3.Feb. includes: Finalized CU optical design, updated cost estimate, possible manufactures, Obtain quotes for CRL (estimate: ~ kEuro) Selection and location of lamps – CU mechanical design document: due at 10. Feb. includes: Folded beam option, weights, proposed location options – Optical designer meeting at AIP (9.3. proposed) – Mechanical Designer meeting at IAG (31.3. proposed) CU: foreseen work

17 , PM4.17 CRL – alternative design v1: Apochromat triplet made of: K5 / CaF2 / K5 v2: Achromat doublet made of: N-BK7 / F2

18 , PM nm 436 nm 707 nm 480 nm 644 nm pupil polychrom. CRL – Achromat (BK7) spot diagramms on-axis off-axis -> 0.15mm VLT Airy disk

19 , PM4.19 ~1.2 m Top: VLT beam (F/15) Center: CU beam v1 Bottom: CU beam v1p Integrating Sphere (IS) = focal plane 2 x Calibration Relay Lens (CRL) CU Focal Plane (CFP) CU design v1p: with internal pupil Intermediate Pupil Plane (IPP) Only if an intermediate pupil is needed before the focal plane

20 , PM4.20 A trace mask (right) is used to trace possible distortions of the spectra (left). Trace Mask

21 , PM4.21 Flatfield Calibration: spatially uniform to within 10% over full FOV spatially uniform to within 1% over any subfield of 1/10 FOV spectral uniformity 30% (blackbody) SNR > 100 in 10 sec exposures spatial and spectral stability 1 % over 24 hours Wavelength Calibration: nominal wavelength range : – m accuracy: 1/10 pixel (system level) spectral line lamps : TBD typical exposure time : 10 sec with SNR ~ 20 Image Quality Calibration: measuring PSF at any wavelength over whole FOV with 1% accuracy 3 PSFs for each slice PSF pinhole at any position over FOV pinhole stability: 1/10 spaxel ( 11.6 m WFM / 1.5 m NFM ) Requirements details for details see: CU Technical Specifications Version: 2.3 from: 26/04/2005 VLT-SPE-MUS


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