Results 31 to 40 of about 70,563 (294)

Decoupled Object-Independent Image Features for Fine Phasing of Segmented Mirrors Using Deep Learning

Remote Sensing, 2022
A segmented primary mirror is very important for extra-large astronomical telescopes, in order to detect the phase error between segmented mirrors. Traditional iterative algorithms are hard to detect co−phasing aberrations in real time due to the long ...
Yirui Wang, Chunyue Zhang, Liang Guo, Shuyan Xu, Guohao Ju   +4 more
doaj   +1 more source

Study of a MEMS-based Shack-Hartmann wavefront sensor with adjustable pupil sampling for astronomical adaptive optics [PDF]

, 2008
We introduce a Shack-Hartmann wavefront sensor for adaptive optics that enables dynamic control of the spatial sampling of an incoming wavefront using a segmented mirror microelectrical mechanical systems (MEMS) device.
Baranec, Christoph, Dekany, Richard
core   +1 more source

Control and Alignment of Segmented-Mirror Telescopes: Matrices, Modes, and Error Propagation [PDF]

, 2004
Starting from the successful Keck telescope design, we construct and analyze the control matrix for the active control system of the primary mirror of a generalized segmented-mirror telescope, with up to 1000 segments and including an alternative sensor ...
Chanan, Gary, MacMartin, Douglas G., Mast, Terry, Nelson, Jerry   +3 more
core   +1 more source

Identification and simulation of surface alpha events on passivated surfaces of germanium detectors and the influence of metalisation

European Physical Journal C: Particles and Fields, 2022
Events from alpha interactions on the surfaces of germanium detectors are a major contribution to the background in germanium-based searches for neutrinoless double-beta decay.
I. Abt, C. Gooch, F. Hagemann, L. Hauertmann, X. Liu, O. Schulz, M. Schuster, A. J. Zsigmond   +7 more
doaj   +1 more source

Techniques for the Investigation of Segmented Sensors Using the Two Photon Absorption-Transient Current Technique

Sensors, 2023
The two photon absorption-transient current technique (TPA-TCT) was used to investigate a silicon strip detector with illumination from the top. Measurement and analysis techniques for the TPA-TCT of segmented devices are presented and discussed using a ...
Sebastian Pape, Esteban Currás, Marcos Fernández García, Michael Moll   +3 more
doaj   +1 more source

Design and Parameter Identification for a Positioning Platform with a Large Stroke and High Precision for Segmented Mirrors

Micromachines, 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 mirrors ...
Zihao Yin, Rongjie Qin, Haoting Du, Weiyinuo Zhou, Jialin Sun, Dexin Sun, Yinnian Liu   +6 more
doaj   +1 more source

Design and Research of Large-Scale Curvature Adjustment Optical Mirror

Photonics
This study introduces an optimization design method for large-scale curvature-adjustable optical mirrors, innovatively integrating parametric modeling with the optimized layout of actuators, targeting the achievement of extensive curvature adjustability ...
Kailun Zhao, Liuxing Song, Dewei Sun, Qiaolin Huang, Rongguang Guo, Guoliang Tian, Jinping He   +6 more
doaj   +1 more source

Fizeau interferometric cophasing of segmented mirrors

Optics Express, 2012
Segmented mirror telescope designs address issues of mechanical rigidity, but introduce the problem of aligning, or cophasing, the separate segments to conform to the optimum mirror shape. While several solutions have been widely adopted, a few difficulties persist - the introduction of non-common path errors and an artificial division of the problem ...
Anthony C, Cheetham, Peter G, Tuthill, Anand, Sivaramakrishnan, James P, Lloyd   +3 more
openaire   +2 more sources

Mirror Position Determination for the Alignment of Cherenkov Telescopes

, 2017
Imaging Atmospheric Cherenkov Telescopes (IACTs) need imaging optics with large apertures to map the faint Cherenkov light emitted in extensive air showers onto their image sensors.
Adam, J., Ahnen, M. L., Baack, D., Balbo, M., Bergmann, M., Biland, A., Blank, M., Bretz, T., Bruegge, K. A., Buss, J., Dmytriiev, A., Domke, M., Dorner, D., Einecke, S., Hempfling, C., Hildebrand, D., Hughes, G., Linhoff, L., Mannheim, K., Mueller, S. A., Neise, D., Neronov, A., Noethe, M., Paravac, A., Pauss, F., Rhode, W., Shukla, A., Temme, F., Thaele, J., Walter, R.   +29 more
core   +1 more source

Wavefront Control Strategies for Large Active Thin Shell Primaries with Unimorph Actuators

Actuators, 2023
This paper presents various aspects of the wavefront control strategies for an ultra-lightweight composite reflector made of polymers for the large primary of a space telescope, and the shape control is made by a set of patterned unimorph strain ...
Kainan Wang, Yian Yu, André Preumont
doaj   +1 more source