Implementation and performance of the metrology system for the multi-object optical and near-infrared spectrograph MOONS

2016 ◽  
Author(s):  
Holger Drass ◽  
Leonardo Vanzi ◽  
Miguel Torres-Torriti ◽  
Rolando Dünner ◽  
Tzu-Chiang Shen ◽  
...  
Keyword(s):  
Near Infrared ◽  
And Performance ◽  
Metrology System

scholarly journals Final design and on-sky testing of the iLocater SX acquisition camera: broad-band single-mode fibre coupling

2020 ◽  
Vol 501 (2) ◽  
pp. 2250-2267
Author(s):  
J Crass ◽  
A Bechter ◽  
B Sands ◽  
D King ◽  
R Ketterer ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Near Infrared ◽  
Broad Band ◽  
Single Mode ◽  
Injection System ◽  
Single Mode Fibre ◽  
Astronomical Instruments ◽  
Final Design ◽  
Camera Design ◽  
And Performance

ABSTRACT Enabling efficient injection of light into single-mode fibres (SMFs) is a key requirement in realizing diffraction-limited astronomical spectroscopy on ground-based telescopes. SMF-fed spectrographs, facilitated by the use of adaptive optics (AO), offer distinct advantages over comparable seeing-limited designs, including higher spectral resolution within a compact and stable instrument volume, and a telescope independent spectrograph design. iLocater is an extremely precise radial velocity (EPRV) spectrograph being built for the Large Binocular Telescope (LBT). We have designed and built the front-end fibre injection system, or acquisition camera, for the SX (left) primary mirror of the LBT. The instrument was installed in 2019 and underwent on-sky commissioning and performance assessment. In this paper, we present the instrument requirements, acquisition camera design, as well as results from first-light measurements. Broad-band SMF coupling in excess of 35 per cent (absolute) in the near-infrared (0.97–1.31 ${\mu {\rm m}}$) was achieved across a range of target magnitudes, spectral types, and observing conditions. Successful demonstration of on-sky performance represents both a major milestone in the development of iLocater and in making efficient ground-based SMF-fed astronomical instruments a reality.

scholarly journals Temperature effects on characteristics and performance of near-infrared wide bandwidth for different avalanche photodiodes structures

2019 ◽  
Vol 14 ◽  
pp. 102399 ◽  
Author(s):  
I.S. Amiri ◽  
Fatma Mohammed Aref Mahmoud Houssien ◽  
Ahmed Nabih Zaki Rashed ◽  
Abd El-Naser A. Mohammed
Keyword(s):  
Temperature Effects ◽  
Near Infrared ◽  
Avalanche Photodiodes ◽  
Wide Bandwidth ◽  
And Performance

Optimization and performance of the Robert Stobie Spectrograph Near-InfraRed detector system

2018 ◽  
Vol 4 (01) ◽  
pp. 1
Author(s):  
Gregory Mosby ◽  
Briana Indahl ◽  
Nathan Eggen ◽  
Marsha Wolf ◽  
Eric Hooper ◽  
...  
Keyword(s):  
Near Infrared ◽  
Infrared Detector ◽  
Detector System ◽  
And Performance ◽  
Optimization And Performance

Near-Infrared Absorbing Squaraine Dyes for Solar Cells: Relationship between Architecture and Performance

2012 ◽  
Vol 116 (16) ◽  
pp. 8894-8900 ◽  
Author(s):  
Zhengquan Yan ◽  
Shanyi Guang ◽  
Xinyan Su ◽  
Hongyao Xu
Keyword(s):  
Solar Cells ◽  
Near Infrared ◽  
Squaraine Dyes ◽  
And Performance

Design and performance of a wide-bandwidth and sensitive instrument for near-infrared spectroscopic measurements on human tissue

2004 ◽  
Vol 75 (12) ◽  
pp. 5315-5325 ◽  
Author(s):  
Luigi Rovati ◽  
Andrea Bandera ◽  
Maurizio Donini ◽  
Giorgia Salvatori ◽  
Luca Pollonini
Keyword(s):  
Human Tissue ◽  
Near Infrared ◽  
Wide Bandwidth ◽  
Spectroscopic Measurements ◽  
Infrared Spectroscopic ◽  
And Performance

Near infrared spectroscopy for rapid determination of solids content of amino resins

2020 ◽  
Vol 28 (5-6) ◽  
pp. 344-350
Author(s):  
M Gonçalves ◽  
NT Paiva ◽  
JM Ferra ◽  
J Martins ◽  
F Magalhães ◽  
...  
Keyword(s):  
Near Infrared ◽  
Rapid Determination ◽  
Nir Spectroscopy ◽  
Coefficient Of Determination ◽  
Water Addition ◽  
Reliable Technique ◽  
Standard Normal Variate ◽  
And Performance ◽  
Solids Content

Near infrared (NIR) spectroscopy is a fast and reliable technique for assessing properties of amino resins. One important property that defines the cost and performance of these resins is the solids content (SC). This work studied the prediction of SC of amino resins by combining NIR spectroscopy with partial least squares (PLS) regression. A total of 990 industrial NIR spectra of amino resins were obtained and split randomly by a ratio of 2/3 for calibration and 1/3 for validation. The best model achieved a root mean-square error of prediction (RMSEP) of 0.32% (m/m) and a coefficient of determination of prediction ([Formula: see text]) of 81%. standard normal variate (SNV) was found to be the NIR pre-processing that provided the best results for model construction. Addition of water to two amino resins showed that the NIR model does not respond to the water addition, despite water making great contribution to the SC value. An inference that can be obtained from this is that the NIR model of amino resins uses NIR properties of amino resins that relate to the SC and from there predict the most probable SC, instead of looking at all the components that affect the SC of amino resins.

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