A generalized differential image motion monitor

Aristidi, Éric; Ziad, Aziz; Chabé, Julien; Yan, F.; Renaud, Catherine; Giordano, Christophe

doi:10.1093/mnras/stz854

Cited by 30 publications

(32 citation statements)

References 13 publications

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“…It may be used as well with a classical DIMM providing that the acquisition camera is fast enough (typically 100 frames/sec) to properly sample the AA correlation times. The outer scale is derived from ratios of absolute to relative AA motions [8]. This parameter is the most sensitive to telescope vibrations, and requires a good stability of the telescope mount and pillar.…”

Section: Resultsmentioning

confidence: 99%

Turbulence monitoring at Calern observatory with the generalized differential image motion monitor

Aristidi¹,

Yan²,

Ziad³

et al. 2020

Adaptive Optics Systems VII

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The Generalised Differential Image Motion Monitor (GDIMM) was proposed a few years ago as a new generation instrument for turbulence monitoring. It measures integrated parameters of the optical turbulence, i.e the seeing, isoplanatic angle, scintillation index, coherence time and wavefront coherence outer scale. GDIMM is based on a fully automatic small telescope (28cm diameter), equipped with a 3-holes mask at its entrance pupil. The instrument is installed at the Calern observatory (France) and performs continuous night-time monitoring of turbulence parameters. In this communication we present long-term and seasonnal statistics obtained at Calern, and combine GDIMM data to provide quantities such as the equivalent turbulence altitude and the effective wind speed.

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Section: Resultsmentioning

confidence: 99%

Turbulence monitoring at Calern observatory with the generalized differential image motion monitor

Aristidi¹,

Yan²,

Ziad³

et al. 2020

Adaptive Optics Systems VII

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show abstract

“…The local meteorological and atmospheric turbulence parameters during the successful LRO two-way laser ranging sessions (passes) are listed in Table 1. The atmospheric turbulence parameters are measured by a Generalized Differential IMage Monitor (G-DIMM) at the Calern Observatory (Aristidi et al 2019). The relatively high humidity (92%) on the second successful pass is due to clouds at the height of the station.…”

Section: Lro -Z Deckmentioning

confidence: 99%

First two-way laser ranging to a lunar orbiter: infrared observations from the Grasse station to LRO’s retro-reflector array

Mazarico

Sun

Torre

et al. 2020

Earth Planets Space

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We present the results of the first series of successful two-way laser ranging experiments from a ground station, the Lunar Laser Ranging (LLR) station in Grasse, France, to a spacecraft at lunar distance, the Lunar Reconnaissance Orbiter (LRO). A 15 × 18 × 5 cm, 650-g array of twelve 32-mm diameter solid corner cubes is mounted on its anti-nadir deck. Ranging to this small retro-reflector array onboard a lunar orbiter from a ground station was a challenge compared to ranging to larger lunar surface retro-reflectors. Grasse measured 67 returns in two 6-min sessions on September 4, 2018. Clear returns were also recorded during two additional sessions on August 23-24, 2019 for which active slewing by LRO was performed to bring the array in view of the station. The measured echos yielded range residuals less than 3 cm (two-way time-of-flight RMS < 180 ps) relative to the reconstructed LRO trajectory. This experiment provides a new method of verifying theories of dust accumulation over decades on the lunar surface. It also showed that the use of similar arrays onboard future lunar landers and orbiters can support LLR lunar science goals, particularly with landing sites near the lunar limbs and poles, which would have better sensitivity to lunar orientation.

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“…Observations are presented in Table 3. For each couple, we report the WDS number, 14 the discoverer designation and components involved (Col. 2), the star name (Col. 3), the epoch of observation in Besselian years (Col. 4), the seeing measured by the CATS station 15 given at λ = 500nm (Col. 5), the exposure time in ms (Col. 6), the total number of frames (Col. 7), the percentage of frames selected by the algorithm (Col. 8), the angular separation in arcsec with its uncertainty (Col. 9), the position angle (Col. 10) and the H magnitude difference (Col. 11). If an orbit is available, the orbit reference (same designation as in the WDS orbit catalog 19 ) is given in Col. 12 as well as the computed separation and position angle (Cols.…”

Section: Measurements On Binary Starsmentioning

confidence: 99%

The power spectrum extended technique applied to images of binary stars in the infrared

Aristidi

Cottalorda

Carbillet

et al. 2020

Adaptive Optics Systems VII

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A generalized differential image motion monitor

Cited by 30 publications

References 13 publications

Turbulence monitoring at Calern observatory with the generalized differential image motion monitor

Turbulence monitoring at Calern observatory with the generalized differential image motion monitor

First two-way laser ranging to a lunar orbiter: infrared observations from the Grasse station to LRO’s retro-reflector array

The power spectrum extended technique applied to images of binary stars in the infrared

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