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Differential Piston Measurement Setup for PWFS Assembly

This lab setup aims to measure differential piston simultaneously using FISBA and PWFS units. It utilizes a differential piston unit and reflects cube displacements for precision measurements. Initial results show RMS data between 14.7 nm and 16.1 nm. The setup does not include ADC or pupil rerotation.

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Differential Piston Measurement Setup for PWFS Assembly

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  1. PWFS4ELTs budget • NOTES • 1FTE = 41KE • YES FoV: 2x2 arcmin • No ADC • No pupil rerotation WFS total cost (HW+LABOUR) = 345KE

  2. PWFS Diff. Pist unit FISBA The lab set-up PWFS (2) assembly Aim of the set up is to measure at the same time a certain differential piston introduced using (3) with the two instrument FISBA (1) and PWFS (2). FISBA interf. Unit (1) Unit for (3) Differential piston The differential piston unit is showed in the next slide !

  3. Details of Differential piston unit Piezo driver for cube displacements Reflecting surfaces of the cubes DP unit Fisba Int

  4. A first result from lab Comparison of interferometer and pyramid measurements of the same differential piston, using LBT pyramid wavefront sensor and FISBA interferometr. RMS data with respect to fit is between 14.7 nm and 16.1 nm for linear fit and linear fit through origin respectively.

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