Zobrazeno 1 - 10
of 2 841
pro vyhledávání: '"Active optics"'
Publikováno v:
IEEE Photonics Journal, Vol 15, Iss 3, Pp 1-6 (2023)
A metrology system capable of cofocusing and cophasing is essential to ensure the performance of large segmented space telescopes, similar to that of monolithic telescopes, as well as to image the faintest galaxies. A fiber-linked–wavefront-sensing
Externí odkaz:
https://doaj.org/article/144f5133d706487999a304f8e597da64
Publikováno v:
IEEE Photonics Journal, Vol 15, Iss 2, Pp 1-6 (2023)
To precisely map cosmic structures and capture time-domain events, future large survey telescopes will be equipped with segmented detectors that greatly expand their field of view. Segment flatness and assembly accuracy will be essential for them to
Externí odkaz:
https://doaj.org/article/24d13574958c45089406c96d393c399e
Publikováno v:
Optics, Vol 4, Iss 1, Pp 39-54 (2023)
We present new results obtained from the modeling of a tulip-like variable curvature mirror (VCM) in the case of a central force that reacts to its contour. From Nastran finite element analysis, we shows that 3-D optimizations, using non-linear stati
Externí odkaz:
https://doaj.org/article/03f2f70725864f5e8da96567a389bf64
Publikováno v:
Micromachines, Vol 14, Iss 10, p 1855 (2023)
This paper explores advanced shape control techniques for ultra-lightweight electro-actuated polymers with composite ferroelectric thin films. It begins with an overview of PVDF-TrFE film actuators used in the development of thin-shell composites, em
Externí odkaz:
https://doaj.org/article/b885198c49054bacaaa9c39be9ead277
Publikováno v:
Micromachines, Vol 14, Iss 9, p 1756 (2023)
This paper focuses on the change of morphing capabilities for a unimorph deformable mirror impacted by environmental factors, which works in space for active optics applications. Various aspects of disturbing sources are considered, including complex
Externí odkaz:
https://doaj.org/article/30f119d44ba147fcaba89091b8359b9e
Publikováno v:
Applied Sciences, Vol 13, Iss 17, p 9966 (2023)
Active optics is a key technology in ground-based large-aperture telescopes. The active correction of the surface shape of the primary mirror is used to reduce the surface shape error and improve the imaging quality. At present, the structure of the
Externí odkaz:
https://doaj.org/article/05ebdba9d9274230a4d7b07ec75579d0
Akademický článek
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Publikováno v:
Sensors, Vol 23, Iss 10, p 4966 (2023)
The presence of manufacture error in large mirrors introduces high-order aberrations, which can severely influence the intensity distribution of point spread function. Therefore, high-resolution phase diversity wavefront sensing is usually needed. Ho
Externí odkaz:
https://doaj.org/article/5bcf2a0cb3b1489cb578561a641b90ac
Publikováno v:
Photonics, Vol 10, Iss 4, p 388 (2023)
Presently, the segmented mirror is the mainstream development direction of large-aperture telescopes. The key problem affecting the performance of segmented mirror telescopes concerns the co-phase of the segments. The segments’ co-phase includes th
Externí odkaz:
https://doaj.org/article/16e0365f2a8d4a07b50737d1dea15493
Publikováno v:
Micromachines, Vol 14, Iss 4, p 713 (2023)
An active optical system with three segmented mirrors was proposed to verify the co-focus and co-phase progress. In this system, a kind of large-stroke and high-precision parallel positioning platform was specially developed to help support the mirro
Externí odkaz:
https://doaj.org/article/93b093a224f04394a8ca7dab39b91e46