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[Untitled]
- Source :
- Solar Physics. 206:189-207
- Publication Year :
- 2002
- Publisher :
- Springer Science and Business Media LLC, 2002.
-
Abstract
- Active or adaptive optics often require the ability to characterize wavefront aberrations using natural extended sources. The task becomes especially challenging when dealing with widely extended sources such as the solar granulation. We propose a new approach based on the processing of oppositely defocused images. This method, which is a generalization of a technique known as curvature sensing, derives the wavefront curvature from the difference between two oppositely defocused images and determines the second momenta of the point spread function. The proposed method measures the wavefront aberration from the images themselves, requires little computational resources, is fast enough to be used in a real-time adaptive optics system and is particularly adapted to random patterns such as solar granulation or spot penumbras whose morphology evolves during the observation. We envision the application of the method to real-time seeing compensation in solar astronomical telescopes, and to the correction of optical system aberrations in remote sensing instrumentation. This effort is directed towards building a curvature sensor for the real-time applications.
- Subjects :
- Physics
Wavefront
Point spread function
business.industry
Astrophysics::Instrumentation and Methods for Astrophysics
Astronomy and Astrophysics
Wavefront sensor
Curvature
Deformable mirror
Compensation (engineering)
Vergence (optics)
Optics
Space and Planetary Science
Astrophysics::Solar and Stellar Astrophysics
Adaptive optics
business
Subjects
Details
- ISSN :
- 00380938
- Volume :
- 206
- Database :
- OpenAIRE
- Journal :
- Solar Physics
- Accession number :
- edsair.doi...........4f0f17488ded64b050111bbc7a5c620c