Results 11 to 20 of about 345,237 (255)
In-Situ Metrology of Large Segmented Detector Based on Modified Optical Truss
IEEE Photonics Journal, 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 make
Qichang An +6 more
doaj +1 more source
Visible extreme adaptive optics for GMagAO-X with the triple-stage AO architecture (TSAO) [PDF]
Astronomical Telescopes + Instrumentation, 2022 The Extremely Large Telescopes will require hundreds of actuators across the pupil for high Strehl in the visible. We envision a triple-stage AO (TSAO) system for GMT/GMagAO-X to achieve this.
S. Haffert +5 more
semanticscholar +1 more source
Research on piston error sensing for segmented mirrors under atmospheric turbulence.
Optics Express, 2023 Large aperture ground-based segmented telescopes typically use electrical edge sensors to detect co-phase errors. However, complex observing environments can lead to zero-point drift of the edge sensors, making it challenging to maintain the long-term co-
Bin Wang +4 more
semanticscholar +1 more source
Spatiotemporal statistics of the turbulent piston-removed phase and Zernike coefficients for two distinct beams. [PDF]
Journal of The Optical Society of America A-optics Image Science and Vision, 2021 In the context of adaptive optics for astronomy, one can rely on the statistics of the turbulent phase to assess a part of the system's performance. Temporal statistics with one source and spatial statistics with two sources are well known and widely ...
C. Plantet +3 more
semanticscholar +1 more source
Design and development of a 329-segment tip-tilt piston mirror array for space-based adaptive optics
SPIE MOEMS-MEMS, 2006 Jason B. Stewart +5 more
openalex +2 more sources
Phasing the Mirror Segments of the Keck Telescopes: The Broadband Phasing Algorithm [PDF]
, 1998 To achieve its full diffraction limit in the infrared, the primary mirror of the Keck telescope (now telescopes) must be properly phased: The steps or piston errors between the individual mirror segments must be reduced to less than 100 nm. We accomplish
Chanan, Gary +6 more
core +1 more source
A Demonstration of Wavefront Sensing and Mirror Phasing from the Image Domain [PDF]
, 2014 In astronomy and microscopy, distortions in the wavefront affect the dynamic range of a high contrast imaging system. These aberrations are either imposed by a turbulent medium such as the atmosphere, by static or thermal aberrations in the optical path,
Cheetham, Anthony +5 more
core +2 more sources
Optics Express, 2021 Coherent beam combination (CBC) holds promise for scaling the output power of the laser system while maintaining good beam quality. Owing to the thermal effect and mechanics instability, piston and tilt distortions always exist and affect the performance
Qi Chang +6 more
semanticscholar +1 more source
Oil Film Formation of Reciprocating Seals Observed by Interferometry
Tribology Online, 2014 Oil film thickness in rubber piston seals is measured by interferometry. Optimized optics and fluids enable clear interferograms. The oil film thickness on the contact area is measured during reciprocating motion.
Kenichi Yoshimura +2 more
doaj +1 more source
Sensors, 2010 Since the beginning of the Mars planet exploration, the characterization of carbon dioxide hypersonic flows to simulate a spaceship’s Mars atmosphere entry conditions has been an important issue.
Raphäel Vallon +5 more
doaj +1 more source