Effect of telescope vibrations upon high angular resolution imaging

Altarac, S.; Berlioz-Arthaud, Paul; Thiébaut, Éric; Foy, R.; Balega, Y. Y.; Dainty, J. C.; Fuensalida, J. J.

doi:10.1046/j.1365-8711.2001.04111.x

Cited by 13 publications

(4 citation statements)

References 11 publications

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“…Despite different values of D/r 0 , the HF part of the spectra is almost the same for all reference stars and reaches 10 −6 level at about 0.9f c . We suspect that additional damping of the HF power is caused mostly by small telescope vibrations, as found previously at other telescopes used for speckle interferometry (Altarac et al 2001). The dotted line in Fig.…”

Section: Observations and Data Processingsupporting

confidence: 77%

First Speckle Interferometry at SOAR Telescope with Electron-Multiplication CCD

Tokovinin¹,

Cantarutti²

2008

PUBL ASTRON SOC PAC

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A simple camera with electron-multiplication CCD, fast frame rate, and pixel scale of 15 mas is described. This instrument was tested at the SOAR 4-m telescope in speckle interferometry regime. The data were processed by the standard speckle algorithm permitting to derive binary-star parameters. We observed 29 objects with separations from 21 mas to 1. 32, mostly southern binaries with known orbits. Some pairs require orbit revision. Two spectroscopic binaries HIP 9631 and HIP 11072 and the astrometric binary κ For are resolved for the first time, three objects were unresolved.

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Section: Observations and Data Processingsupporting

confidence: 77%

First Speckle Interferometry at SOAR Telescope with Electron-Multiplication CCD

Tokovinin¹,

Cantarutti²

2008

PUBL ASTRON SOC PAC

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“…Mechanical vibrations in large, state-of-the-art optical-imaging systems, both ground-based [1,18] and space-borne [19], are often the dominating cause of image distortion and pointing errors. These vibrations may "originate from a myriad of different sources: structural vibrations of the telescope and prefocal mirrors due to wind buffeting, rigid body resonances, motor rotation, power ripples, cryogenic pumps, cooling fans, and hydraulic bearing systems amongst others" (p. 185 in [1]).…”

Section: A Relationship Between Wind-induced Aoa Jitter and Wind Speedmentioning

confidence: 99%

“…(18)], τ d − dΦ 12 ω dω ; (18) and can be utilized to obtain the transverse wind velocity akin to the TDP estimator {Eq. (11) of [11]}.…”

Section: Time Domain Versus Frequency Domain Wind Estimatorsmentioning

confidence: 99%

Effects of wind-driven telescope vibrations on measurements of turbulent angle-of-arrival fluctuations

Tichkule

Muschinski

2014

Appl. Opt.

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Turbulence in the atmospheric refractive-index field causes optical angle-of-arrival (AOA) fluctuations that can be used for atmospheric remote sensing of various parameters, including wind velocities and the optical refractive-index turbulence structure parameter, C(n)2. If AOA measurements are contaminated by wind-induced telescope vibrations, the underlying retrieval algorithms may fail. In order to study the effects of wind-driven telescope vibrations on optical-turbulence measurements, we conducted a field experiment in which we exposed two small telescopes deliberately to the wind. We measured AOA fluctuations of visible light propagating along a horizontal, 174 m long path 1.7 m above flat terrain, and we used fast-response ultrasonic anemometers to measure the wind velocity at multiple locations along the path. We found (1) that the AOA turbulence spectra were contaminated by multiple resonance peaks, (2) that the resonance frequencies were independent of the wind speed, and (3) that the AOA variance associated with the dominating vibration mode was proportional to the fourth power of the wind speed.

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“…This is the case of the research carried out at the Daniel K. Inouye Solar Telescope [ 12 ], where the authors managed to establish coherence between different points of the upper and lower part of the assembly of more than 80%, and therefore found the sources of the forces that caused it. The research carried out at the William Herschel Telescope (WHT), Big Telescope Azimuthal (BTA), and Canada–France–Hawaii Telescope (CFHT) [ 13 ] focused their efforts on analyzing the vibrations produced in the telescope and their effect on the acquisition of images. To do this, they measured very weak movements below the positioning instrumentation with accelerometers, which allowed them to verify that the positioning was correct and to establish the bases of the improvement in other similar telescopes.…”

Section: Introductionmentioning

confidence: 99%

Study on the Vibration Characteristics of the Telescope T80 in the Javalambre Astrophysical Observatory (JAO) Aimed at Detecting Invalid Images

Martínez

Ferrer

Palacios-Navarro

et al. 2020

Sensors

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The location of large telescopes, generally far from the data processing centers, represents a logistical problem for the supervision of the capture of images. In this work, we carried out a preliminary study of the vibration signature of the T80 telescope at the Javalambre Astrophysical Observatory (JAO). The study analyzed the process of calculating the displacement that occurs because of the vibration in each of the frequencies in the range of interest. We analyzed the problems associated with very low frequencies by means of simulation, finding the most critical vibrations below 20 Hz, since they are the ones that generate greater displacements. The work also relates previous studies based on simulation with the real measurements of the vibration of the telescope taken remotely when it is subjected to different positioning movements (right ascension and/or declination) or when it performs movement actions such as those related to filter trays or mirror cover. The obtained results allow us to design a remote alarm system to detect invalid images (taken with excess vibration).

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Effect of telescope vibrations upon high angular resolution imaging

Cited by 13 publications

References 11 publications

First Speckle Interferometry at SOAR Telescope with Electron-Multiplication CCD

First Speckle Interferometry at SOAR Telescope with Electron-Multiplication CCD

Effects of wind-driven telescope vibrations on measurements of turbulent angle-of-arrival fluctuations

Study on the Vibration Characteristics of the Telescope T80 in the Javalambre Astrophysical Observatory (JAO) Aimed at Detecting Invalid Images

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