An Image Motion Compensation System for the Multi-Object Double Spectrograph

Marshall, J. L.; Atwood, Bruce; Byard, P. L.; DePoy, D. L.; O’Brien, T. P.; Pogge, Richard W.

doi:10.1117/12.459935

Cited by 6 publications

(6 citation statements)

References 3 publications

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“…Without active compensation, image motion deflections could be ∼100 µm in the focal plane. Recent tests of an IMCS prototype suggest that the deflections can be reduced to ∼1 µm rms (Marshall et al 2004). …”

Section: The Multiobject Double Spectrograph (Mods)mentioning

confidence: 97%

“…The baseline plan calls for the installation of one or two buttable 4K × 4K pixel CCDs by the University of Arizona Imaging Technologies Laboratory. In addition, MODS incorporates a close-loop image motion compensation system (IMCS; Marshall et al 2002;Marshall et al 2004) to compensate for flexure due to gravity, temperature fluctuations, and mechanical effects. Without active compensation, image motion deflections could be ∼100 µm in the focal plane.…”

Section: The Multiobject Double Spectrograph (Mods)mentioning

confidence: 99%

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An overview of instrumentation for the Large Binocular Telescope

Wagner

2004

SPIE Proceedings

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An overview of instrumentation for the Large Binocular Telescope is presented. Optical instrumentation includes the Large Binocular Camera (LBC), a pair of wide-field (27 × 27 ) UB/VRI optimized mosaic CCD imagers at the prime focus, and the Multi-Object Double Spectrograph (MODS), a pair of dual-beam blue-red optimized long-slit spectrographs mounted at the straight-through F/15 Gregorian focus incorporating multiple slit masks for multi-object spectroscopy over a 6 field and spectral resolutions of up to 8000. Infrared instrumentation includes the LBT Near-IR Spectroscopic Utility with Camera and Integral Field Unit for Extragalactic Research (LUCIFER), a modular near-infrared (0.9-2.5 µm) imager and spectrograph pair mounted at a bent interior focal station and designed for seeing-limited (FOV: 4 × 4 ) imaging, long-slit spectroscopy, and multi-object spectroscopy utilizing cooled slit masks and diffraction limited (FOV: 0 .5 × 0 .5) imaging and long-slit spectroscopy. Strategic instruments under development for the remaining two combined focal stations include an interferometric cryogenic beam combiner with near-infrared and thermal-infrared instruments for Fizeau imaging and nulling interferometry (LBTI) and an optical bench beam combiner with visible and near-infrared imagers utilizing multi-conjugate adaptive optics for high angular resolution and sensitivity (LINC/NIRVANA). In addition, a fiber-fed bench spectrograph (PEPSI) capable of ultra high resolution spectroscopy and spectropolarimetry (R = 40,000-300,000) will be available as a principal investigator instrument. The availability of all these instruments mounted simultaneously on the LBT permits unique science, flexible scheduling, and improved operational support.

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Section: The Multiobject Double Spectrograph (Mods)mentioning

confidence: 97%

Section: The Multiobject Double Spectrograph (Mods)mentioning

confidence: 99%

An overview of instrumentation for the Large Binocular Telescope

Wagner

2004

SPIE Proceedings

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“…This is the active system that used an infrared laser to control flexure or temperature induced motions of the science beam. The system is described by Marshall et al (2003); results of lab prototype testing are given in this volume by Marshall et al…”

Section: Other Work and Expected Deploymentmentioning

confidence: 99%

A multi-object double spectrograph for the Large Binocular Telescope

et al. 2004

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We are building a Multi-Object Double Spectrograph for the Large Binocular Telescope. The instrument is designed to have high throughput from 320 to 1000 nm, spectral resolutions of 1,000-10,000, and multi-object capability over a 6 arcminute field. The design incorporates a dichroic and splits the science beam into a blue and a red channel, each of which can illuminate an 8,192 pixel long detector (with 15 micron pixels) with good image quality. The highly modular design can hold up to three gratings and an imaging flat and a selection of filters in each channel, all of which are quickly accessible; this allows for substantial observing flexibility. Progress on the construction of the instrument and future plans will be described.

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“…This approach turned out to be too much of a challenge and the instrument was eventually implemented as a conventional fibre-fed instrument mounted off the telescope. [17] Approaches used for dealing with flexure are:…”

Section: Previous Workmentioning

confidence: 99%

Smart instrument technologies to meet extreme instrument stability requirements

Cunningham

Hastings

Kerber³

et al. 2008

Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation

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The performance requirements for the next generation of ground-based instruments for optical and infrared astronomy on current telescopes and future ELTs are generating extreme requirements for stability, for instance to carry out precise radial velocity measurements, imaging and spectroscopy with high contrast, and diffraction-limited performance at a level of tens of milliarcsecond. As it is not always possible to make use of a gravity-invariant focal station, flexure must be accommodated while still minimising thermal loads for cryogenic instruments. Variable thermal loads are another source of dimensional changes. High stability will require the minimising of the effects of vibration sources, either from the telescope systems or mechanical coolers. All this must be done while maintaining mass budgets, an especial challenge for large, wide-field, multi-object spectrographs.

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An Image Motion Compensation System for the Multi-Object Double Spectrograph

Cited by 6 publications

References 3 publications

An overview of instrumentation for the Large Binocular Telescope

An overview of instrumentation for the Large Binocular Telescope

A multi-object double spectrograph for the Large Binocular Telescope

Smart instrument technologies to meet extreme instrument stability requirements

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