ATTENZIONE! IL REPOSITORY E’ APERTO ESCLUSIVAMENTE ALL’IMMISSIONE DEI RAPPORTI TECNICI (COLLEZIONE 4.01). NON E’ POSSIBILE INSERIRE PRODOTTI IN TUTTE LE ALTRE COLLEZIONI, A CAUSA DI PROBLEMI TECNICI. THE REPOSITORY IS OPEN EXCLUSIVELY FOR THE SUBMISSION OF TECHNICAL REPORTS (COLLECTION 4.01). SUBMISSIONS TO ALL OTHER COLLECTIONS ARE TEMPORARILY UNAVAILABLE, DUE TO TECHNICAL ISSUES.
 

Non-modulated pyramid wavefront sensor: Use in sensing and correcting atmospheric turbulence

Journal
Date Issued
2023
Author(s)
•
•
•
Heritier, Cedric Taïssir
•
Oberti, Sylvain
DOI
Abstract
Context. The diffusion of adaptive optics systems in astronomical instrumentation for large ground-based telescopes is rapidly increasing and the pyramid wavefront sensor is replacing the Shack-Hartmann as the standard solution for single conjugate adaptive optics systems. The pyramid wavefront sensor is typically used with a tip-tilt modulation to increase the linearity range of the sensor, but the non-modulated case is interesting because it maximizes the sensor sensitivity. The latter case is generally avoided for the reduced linearity range that prevents robust operation in the presence of atmospheric turbulence. Aims. We aim to solve part of the issues of the non-modulated pyramid wavefront sensor by reducing the model error in the interaction matrix. We linearize the sensor response in the working conditions without extending the sensor linearity range. Methods. We developed a new calibration approach to model the response of pyramid wave front sensor in partial correction, whereby the working conditions in the presence of residual turbulence are considered. Results. We use in simulations to show how the new calibration approach allows for the pyramid wave front sensor without modulation to be used to sense and correct atmospheric turbulence and we discuss when this case is preferable over the modulated case.
Volume
677
Start page
A168
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2023A%26A...677A.168A
Rights
open.access
File(s)
Loading...
Thumbnail Image
Name

How__why_and_when_to_use_a_non_modulated_PWFS__A_A_version_.pdf

Description
post-print
Size

4.64 MB

Format

Adobe PDF

Checksum (MD5)

483aba59b2cef33c122e1f48954e9558

Loading...
Thumbnail Image
Name

aa46359-23.pdf

Description
Pdf editoriale
Size

6.46 MB

Format

Adobe PDF

Checksum (MD5)

79f523e0d5e4c0f2ffa94750f3df1c14