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Subpixel real-time jitter detection algorithm and implementation for polarimetric and helioseismic imager

Published on Jul 30, 2019in Journal of Astronomical Telescopes, Instruments, and Systems3.143
· DOI :10.1117/1.JATIS.5.3.039003
D. Roma1
Estimated H-index: 1
(University of Barcelona),
Manuel Carmona22
Estimated H-index: 22
(University of Barcelona)
+ 12 AuthorsJosé María Gómez Cama13
Estimated H-index: 13
(University of Barcelona)
Abstract
  • References (24)
  • Citations (0)
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References24
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#1Sami K. Solanki (MPG: Max Planck Society)H-Index: 60
#2J. C. del Toro Iniesta (CSIC: Spanish National Research Council)H-Index: 30
Last. E Kilders (University of Valencia)H-Index: 1
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Aims. This paper describes the Polarimetric and Helioseismic Imager on the Solar Orbiter mission (SO/PHI), the first magnetograph and helioseis-mology instrument to observe the Sun from outside the Sun-Earth line. It is the key instrument meant to address the top-level science question: How does the solar dynamo work and drive connections between the Sun and the heliosphere? SO/PHI will also play an important role in answering the other top-level science questions of Solar Orbiter, as well as ho...
7 CitationsSource
#1D. Roma (University of Barcelona)H-Index: 1
#2Jordi Bosch (University of Barcelona)H-Index: 41
Last. R. Volkmer (Kiepenheuer Institut für Sonnenphysik)H-Index: 9
view all 13 authors...
In this paper we describe different procedures to compensate the fixed pattern noise (FPN). These procedures have been developed and tested for a camera designed by us, which is based on a CMOS active pixel sensor (APS). In this kind of sensors, the FPN mainly depends on the noise coming from the column selection electronics. In this sense, we suggest and assess three different methods for FPN compensation: using a simple model taking into account this dependency, using an external test signal r...
1 CitationsSource
#1Albert CasasH-Index: 13
Last. W. Schmidt (Kiepenheuer Institut für Sonnenphysik)H-Index: 16
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The tip/tilt driver is part of the Polarimetric and Helioseismic Imager (PHI) instrument for the ESA Solar Orbiter (SO), which is scheduled to launch in 2017. PPHI captures polarimetric images from the Sun to better understand our nearest star, the Sun. The paper covers an analog amplifier design to drive capacitive solid state actuator such ass piezoelectric actuator. Due to their static and continuous operation, the actuator needs to be supplied by high-quality, low-frequency, high-voltage sin...
1 CitationsSource
#1T. Berkefeld (Kiepenheuer Institut für Sonnenphysik)H-Index: 6
#2Dirk SchmidtH-Index: 11
Last. Andreas Fischer (Kiepenheuer Institut für Sonnenphysik)H-Index: 7
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We present the properties of the adaptive optics (AO) system of the German 1.5m solar telescope GREGOR, located on the island of Tenerife, Spain. The conventional AO system uses a correlating Shack-Hartmann-Sensor with a 92mm subaperture size and a 256-actuator stacked-piezo deformable mirror (DM). AO performance results and practical experience based on the last four years of operation are presented. A recently installed second wavefront sensor with exchangeable lenslets / subaperture sizes in ...
2 CitationsSource
#1Manuel CarmonaH-Index: 22
Last. W. Schmidt (Kiepenheuer Institut für Sonnenphysik)H-Index: 16
view all 13 authors...
The Polarimetric and Helioseismic Imager (PHI) instrument is part of the remote instruments for the ESA Solar Orbiter (SO), which is scheduled to launch in 2017. PHI captures polarimetric images from the Sun to better understand our nearest star, the Sun. A set of images is acquired with different polarizations, and afterwards is processed to extract the Stokes parameters. As Stokes parameters require the subtraction of the image values, in order to get the desired quality it is necessary to hav...
5 CitationsSource
#1Amit Pande (UC Davis: University of California, Davis)H-Index: 16
#2Shaxun Chen (UC Davis: University of California, Davis)H-Index: 11
Last. Joseph Zambreno (Iowa State University)H-Index: 20
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Digital camera identification can be accomplished based on sensor pattern noise, which is unique to a device, and serves as a distinct identification fingerprint. Camera identification and authentication have formed the basis of image/video forensics in legal proceedings. Unfortunately, real-time video source identification is a computationally heavy task, and does not scale well to conventional software implementations on typical embedded devices. In this paper, we propose a hardware architectu...
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#1J. Schou (Stanford University)H-Index: 9
#2Philip H. Scherrer (Stanford University)H-Index: 44
Last. Steven Tomczyk (NCAR: National Center for Atmospheric Research)H-Index: 25
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The Helioseismic and Magnetic Imager (HMI) investigation (Solar Phys. doi: 10.1007/s11207-011-9834-2, 2011) will study the solar interior using helioseismic techniques as well as the magnetic field near the solar surface. The HMI instrument is part of the Solar Dynamics Observatory (SDO) that was launched on 11 February 2010. The instrument is designed to measure the Doppler shift, intensity, and vector magnetic field at the solar photosphere using the 6173 A Fe i absorption line. The instrument...
756 CitationsSource
#1Sanjeev Kumar (UCSD: University of California, San Diego)H-Index: 5
#2Haleh Azartash (UCSD: University of California, San Diego)H-Index: 3
Last. Truong Q. Nguyen (UCSD: University of California, San Diego)H-Index: 45
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We propose a fast and robust 2D-affine global motion estimation algorithm based on phase-correlation in the Fourier-Mellin domain and robust least square model fitting of sparse motion vector field and its application for digital image stabilization. Rotation-scale-translation (RST) approximation of affine parameters is obtained at the coarsest level of the image pyramid, thus ensuring convergence for a much larger range of motions. Despite working at the coarsest resolution level, using subpixe...
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#1Mats G. Löfdahl (Royal Swedish Academy of Sciences)H-Index: 21
Context. Solar Shack–Hartmann wavefront sensors measure differential wavefront tilts as the relative shift between images from different subapertures. There are several methods in use for measuring these shifts. Aims. We evaluate the inherent accuracy of the methods and the effects of various sources of error, such as noise, bias mismatch, and blurring. We investigate whether Z-tilts or G-tilts are measured. Methods. We test the algorithms on two kinds of artificial data sets, one corresponding ...
28 CitationsSource
#1Toshifumi Shimizu (JAXA: Japan Aerospace Exploration Agency)H-Index: 36
#2S. Nagata (Kyoto University)H-Index: 16
Last. Yoshinori SuematsuH-Index: 30
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The Hinode Solar Optical Telescope (SOT) is the first space-borne visible-light telescope that enables us to observe magnetic-field dynamics in the solar lower atmosphere with 0.2 – 0.3 arcsec spatial resolution under extremely stable (seeing-free) conditions. To achieve precise measurements of the polarization with diffraction-limited images, stable pointing of the telescope (<0.09 arcsec, 3σ) is required for solar images exposed on the focal plane CCD detectors. SOT has an image stabilization ...
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