Results 271 to 280 of about 44,477 (288)
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Wavefront reconstruction using smartphone based wavefront sensors
SPIE Proceedings, 2015Smartphone camera system has the capability of being integrated into powerful field-sensing tools, capturing data and sharing these data with computing servers or cloud experts. The purpose of this work is to implement a wavefront sensor based on the smartphone platform, which has many potential applications in thin-films and bio-related sensing areas.
Zhenyu Yang, Qiwen Zhan
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Improvements to the modal holographic wavefront sensor
Applied Optics, 2016The Zernike coefficients of a light wavefront can be calculated directly by intensity ratios of pairs of spots in the reconstructed image plane of a holographic wavefront sensor (HWFS). However, the response curve of the HWFS heavily depends on the position and size of the detector for each spot and the distortions introduced by other aberrations.
Andrew Lambert, Fanpeng Kong
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Integrated Optical Wavefront Sensor
SPIE Proceedings, 1985This paper presents a design for an integrated optical wavefront sensor. Light from an aperture is focussed by a lens onto a detector array. The resulting signals can be used to determine the amount of angular tilt of the wavefront. Parameters affecting angular resolution are analyzed. Tilt angles as small as 10 -5 rad are detectable.
H. E. Tomaschke, R. R. Rice
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Wavefront reconstruction with the cone sensor
2020 35th International Conference on Image and Vision Computing New Zealand (IVCNZ), 2020Wavefronts of light from celestial objects are aberrated by Earth’s evolving atmosphere, causing images captured by ground-based telescopes to be distorted. The slope of the phase of the wavefront can be estimated by a pyramid wavefront sensor, which subdivides the complex field at the focal plane of the telescope, producing four images of the aperture.
Richard Clare +2 more
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Digital holographic wavefront sensor
Imaging and Applied Optics 2015, 2015For free-space laser communications and for tracking of high-speed airborne objects Shack-Hartmann sensor is not effective. Its performance is limited by scintillation. We characterize a promising modal alternative: digital holographic wavefront sensor. The sensor is very robust to scintillation, residual tip/tilt and misalignments.
Marin-Palomo, P., Zepp, A., Gladysz, S.
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A novel wavefront sensor for interferometry
SPIE Proceedings, 2003A new design for a wavefront sensor suitable for low-order low-light correction is shown. The hybrid modal sensor, the Nine Element (NE) sensor, is compared with a curvature sensor and quadcell under single aperture applications. The design of the NE sensor allows the use of readily-available array detectors.
Christopher A. Haniff +3 more
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Compact multireference wavefront sensor design
Optics Letters, 2005We present a compact optical design for a multireference Shack-Hartmann-based wavefront sensor (WFS) for multiconjugate adaptive optical systems. The key component of this WFS design is a field lenslet array that separates the exit pupil images in the sensing plane for all reference sources. An analytical method for WFS optical design is presented, and
Alexander V. Goncharov +2 more
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MEMS reflective wavefront sensor
SPIE Proceedings, 2007Sandia National Laboratory has constructed several segmented MEMS deformable mirrors that are under investigation for their suitability in Adaptive Optics systems for the Naval Research Laboratory. These mirrors are constructed in a hexagonal array and have been constructed with flat surfaces, or with optical power allowing each mirror to bring its
Don M. Payne +6 more
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An Improved Holographic Wavefront Sensor
Imaging and Applied Optics 2016, 2016We present a more robust holographic wavefront sensor (HWFS) which is less affected by aberrations during reconstruction and works in multiwavelength and broadband light.
Andrew Lambert, Fanpeng Kong
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x–y curvature wavefront sensor
Optics Letters, 2015In this Letter, we propose a new curvature wavefront sensor based on the principles of optical differentiation. The theoretically modeled setup consists of a diffractive optical mask placed at the intermediate plane of a classical two-lens coherent optical processor. The resulting image is composed of a number of local derivatives of the entrance pupil
Pedro J. Valle, Manuel P. Cagigal
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