A flexible and user friendly CPU-based AO software J. MOCCI, M. - - PowerPoint PPT Presentation

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A flexible and user friendly CPU-based AO software J. MOCCI, M. - - PowerPoint PPT Presentation

Nov 29, 2022 45 likes •235 views

A flexible and user friendly CPU-based AO software J. MOCCI, M. QUINTAVALLA, C. TRESTINO, S. BONORA AND R.MURADORE UNIVERSIT DEGLI STUDI DI VERONA CNR-IFN, PADOVA ADONI 2017, PADOVA (IT) 1 Adaptive Optics Basics Wavefront Sensor USB

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A flexible and user friendly CPU-based AO software

  • J. MOCCI, M. QUINTAVALLA, C. TRESTINO, S.

BONORA AND R.MURADORE UNIVERSITÀ DEGLI STUDI DI VERONA CNR-IFN, PADOVA

ADONI 2017, PADOVA (IT)

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Adaptive Optics – Basics

Wavefront Sensor Portable Computer USB Interface PhotonLoop Software Deformable Element

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Adaptive Optics – Architecture

Complexity Performance CPU GPU FPGA Our Contribution

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PhotonLoop – Introduction

PhotonLoop is a flexible and user-friendly CPU-based Adaptive Optics software. Measures:

  • Zernike polynomials and wavefront shape from wavefront slopes (using a

Shack-Hartmann WFS).

Corrects:

  • closed-loop and open-loop with PI control; Hadamard calibration; can apply

Zernike offset to be generated by the controller.

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PhotonLoop – Introduction

Flexible:

  • any size of WFS aperture (any number of centroids); any number of DM

actuators; fully scriptable.

User Friendly:

  • graphical representationof all data structures; advanced tools for WFS and DM

calibration; real-time performance monitors.

Fast:

  • closed-loop frequency up to 500Hz; total closed-loop latency of 2-3 ms (2

frames).

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PhotonLoop – Development

C++:

  • guarantees high performance and promotes Object-Oriented Programming

(OOP).

Qt Framework:

  • cross-platform utility libraries for GUI and OS-dependent operations.

Eigen:

  • efficient vector and matrix operations.

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PhotonLoop – Architecture

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PhotonLoop – Control Layer

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Fast data loop Real-time constraints

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PhotonLoop – WFS

Fast centroiding algorithm:

  • Uses Thresholded Weighted Center of Gravity.

Operation on integers for speed. Parallellized:

  • independent centroids are offloaded to the single CPU cores

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PhotonLoop – WFS

Reference

  • Can remove global tilt; can be set relative to centroids.

Zernike

  • Decompose the wavefront slopes to any number of Zernike terms with

least-squares methods.

Reconstruction

  • Uses modal reconstructions from Zernike terms

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PhotonLoop – Controller

Calibration:

  • DM is calibrated with Influence Functions or

Hadamard patterns

  • the interaction matrix is processed with SVD

decomposition

Closed Loop:

  • parallel array of PI compensators with anti

wind-up to avoid actuators saturation Hadamard Matrix Controlled Plant Scheme

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PhotonLoop – Monitor Layer

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PhotonLoop – User Interface

Intensity Graph Grid Tools Tools Visualization Toggles Full Screen Slopes

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PhotonLoop – User Interface

Control Parameters Main Tools Pages Statistics Status Bar Zernike Actuators Wavefront System Modes Intensities System Modes

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PhotonLoop – Logging

Logging

  • Flexible log engine to record time

series of the internal data

  • Can be saved to disk as contiguous
  • r segmented sessions

Actuator Rise Time @ 2.5kHz

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PhotonLoop – Playback

Playback

  • Recorded time series can be given

as input for testing purposes

  • Especially useful when testing

correction performance amongst devices with fair comparison Correction of a pre-recorded Zernike time series

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PhotonLoop – Scripting

Scripting

  • PhotonLoop can be commanded by

Javascript files

  • Can connect to Matlab or other

softwares by TCP-IP communication Sample Javascript File

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PhotonLoop – Demonstration

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Hadamard Calibration Zernike Generation Aberration Playback and Correction

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Conclusion

We have presented an AO software controllerwhich is

  • Fast: limitedby WFS FPS; 500Hz; 2 frames closed-loop latency
  • Flexible: record, playbackand script engines
  • Friendly: responsive GUI with plenty of calibration tools

We tested it in real worldoptical setups

  • Atmospheric turbulence eval (MBDA, La Spezia)
  • High power laser (Udyni, Politecnicodi Milano)
  • Deformable Mirror/Lens comparison framework (CNR-IFN, Padova)

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