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Torben Anderssen. Profile picture.

Torben Andersen

Professor emeritus

Torben Anderssen. Profile picture.

Image-based wavefront sensing for astronomy using neural networks

Author

  • Torben Andersen
  • Mette Owner-Petersen
  • Anita Enmark

Summary, in English

Motivated by the potential of nondiffraction limited, real-time computational image sharpening with neural networks in astronomical telescopes, we studied wavefront sensing with convolutional neural networks based on a pair of in-focus and out-of-focus point spread functions. By simulation, we generated a large dataset for training and validation of neural networks and trained several networks to estimate Zernike polynomial approximations for the incoming wavefront. We included the effect of noise, guide star magnitude, blurring by wide-band imaging, and bit depth. We conclude that the “ResNet” works well for our purpose, with a wavefront RMS error of 130 nm for r0 = 0.3 m, guide star magnitudes 4 to 8, and inference time of 8 ms. It can also be applied for closed-loop operation in an adaptive optics system. We also studied the possible use of a Kalman filter or a recurrent neural network and found that they were not beneficial to the performance of our wavefront sensor.

Department/s

  • Lund Observatory

Publishing year

2020-07-10

Language

English

Publication/Series

Journal of Astronomical Telescopes, Instruments, and Systems

Volume

6

Issue

3

Document type

Journal article

Publisher

SPIE

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • Neural networks
  • Point spread functions
  • Wavefront sensors
  • Wavefronts
  • Stars
  • Astronomy
  • Telescopes
  • V-band
  • Error analysis

Status

Published

ISBN/ISSN/Other

  • ISSN: 2329-4124