Data analysis for the CHARA Array CLIMB beam combiner

In the same way that every telescope has multiple instruments and cameras, an interferometric array like the CHARA Array will have numerous beam combiners at the back end. And like the instruments of a single telescope, each of these combiners will be optimized for a particular kind of observation or scientific program. In this paper we describe the CLASSIC and CLIMB beam combiners of the CHARA Array. Both are open air, aperture plane, wide bandwidth single spectral channel instruments optimized for sensitivity. CLASSIC is the original two beam combiner used for the first science at CHARA, and it still has the faintest magnitude limit. CLIMB is a three beam expansion of CLASSIC that can also provide closure phase measurements.

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JOUVENCE OF FLUOR: UPGRADES OF A FIBER BEAM COMBINER AT THE CHARA ARRAY

Journal of Astronomical Instrumentation ◽

10.1142/s2251171713400059 ◽

2013 ◽

Vol 02 (02) ◽

pp. 1340005 ◽

Cited By ~ 12

Author(s):

N. J. SCOTT ◽

R. MILLAN-GABET ◽

E. LHOMÉ ◽

T. A. TEN BRUMMELAAR ◽

V. COUDÉ DU FORESTO ◽

...

Keyword(s):

Fourier Transform ◽

Modes Of Operation ◽

Software Upgrades ◽

Remote Operation ◽

Beam Combiner ◽

Control Command ◽

Spectral Dispersion ◽

Chara Array ◽

Software Standards ◽

Pupil Plane

The FLUOR (Fiber Linked Unit for Optical Recombination) interferometric beam combiner located at the CHARA Array on Mt. Wilson, California has recently undergone a program of major upgrades known as Jouvence of FLUOR (JouFLU). These upgrades seek to improve the precision, use, and observing efficiency of FLUOR as well as introduce new modes of operation. A Fourier Transform Spectrograph (FTS) mode and a spectral dispersion mode have been added to improve calibration and data collection. New mechanized stages and new cameras have been added to FLUOR for alignment and pupil plane imaging. Entirely new control/command software has been written for FLUOR which brings it into compliance with CHARA software standards. This allows for continued software upgrades and full remote operation capability. The new JouFLU instrument is now operating on sky and is expected to achieve accurate interferometric visibility amplitude measurements with 0.1 to 0.3% precision.

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Dual three-way infrared beam combiner at the CHARA Array

10.1117/12.857517 ◽

2010 ◽

Cited By ~ 7

Author(s):

Judit Sturmann ◽

Theo ten Brummelaar ◽

Laszlo Sturmann ◽

Harold A. McAlister

Keyword(s):

Beam Combiner ◽

Chara Array

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JouFLU: an upgraded FLUOR beam combiner at the CHARA Array

10.1117/12.925905 ◽

2012 ◽

Cited By ~ 1

Author(s):

E. Lhomé ◽

N. Scott ◽

T. ten Brummelaar ◽

B. Mollier ◽

J. M. Reess ◽

...

Keyword(s):

Beam Combiner ◽

Chara Array

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Prototype single-mode fiber beam combiner for the CHARA array

10.1117/12.317127 ◽

1998 ◽

Author(s):

Nils H. Turner ◽

Theo A. ten Brummelaar

Keyword(s):

Single Mode ◽

Single Mode Fiber ◽

Beam Combiner ◽

Chara Array

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Multi-epoch interferometric observations of the Be star ζ Tau

Proceedings of the International Astronomical Union ◽

10.1017/s1743921311011033 ◽

2010 ◽

Vol 6 (S272) ◽

pp. 424-425

Author(s):

Gail H. Schaefer ◽

Douglas R. Gies ◽

John D. Monnier ◽

Noel D. Richardson ◽

Yamina N. Touhami ◽

...

Keyword(s):

Geometric Model ◽

Position Angle ◽

Brightness Distribution ◽

Be Stars ◽

Monitoring Campaign ◽

Asymmetric Structures ◽

Beam Combiner ◽

Be Star ◽

Outward Motion ◽

Chara Array

AbstractWe present interferometric observations of the Be star ζ Tau obtained using the MIRC beam combiner at the CHARA Array during four epochs in 2007–2009. Fitting a geometric model to the data reveals a nearly edge-on disk with a FWHM of ~1.8 milli-arcsec in the H-band. The non-zero closure phases indicate an asymmetry in the brightness distribution. Interestingly, when combining our results with previously published interferometric observations of ζ Tau, we find a correlation between the position angle of the disk and the spectroscopic V/R ratio, suggesting that the tilt of the disk might be precessing. This work is part of a multi-year monitoring campaign to investigate the development and outward motion of asymmetric structures in the disks of Be stars.

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Microchemical imaging in biomedical research

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100130225 ◽

1992 ◽

Vol 50 (2) ◽

pp. 1118-1119

Author(s):

P. Ingram

Keyword(s):

Data Analysis ◽

Electron Probe ◽

The Other ◽

X Ray ◽

Cell Element ◽

Physiological Information ◽

Functional States ◽

Elemental Maps ◽

Electron Energy Loss ◽

Secondary Ion

It is well established that unique physiological information can be obtained by rapidly freezing cells in various functional states and analyzing the cell element content and distribution by electron probe x-ray microanalysis. (The other techniques of microanalysis that are amenable to imaging, such as electron energy loss spectroscopy, secondary ion mass spectroscopy, particle induced x-ray emission etc., are not addressed in this tutorial.) However, the usual processes of data acquisition are labor intensive and lengthy, requiring that x-ray counts be collected from individually selected regions of each cell in question and that data analysis be performed subsequent to data collection. A judicious combination of quantitative elemental maps and static raster probes adds not only an additional overall perception of what is occurring during a particular biological manipulation or event, but substantially increases data productivity. Recent advances in microcomputer instrumentation and software have made readily feasible the acquisition and processing of digital quantitative x-ray maps of one to several cells.

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Perceptions of a Collaborative Professional Learning Program: Seeing the “Bigger Picture”

Perspectives of the ASHA Special Interest Groups ◽

10.1044/2019_persp-19-00041 ◽

2020 ◽

Vol 5 (1) ◽

pp. 290-303

Author(s):

P. Charlie Buckley ◽

Kimberly A. Murza ◽

Tami Cassel

Keyword(s):

Data Analysis ◽

Professional Learning ◽

Social Communication ◽

Special Educators ◽

Service Providers ◽

Integrative Approach ◽

Theory Approach ◽

Learning Program ◽

Speech Language Pathologists ◽

Related Service

Purpose The purpose of this study was to explore the perceptions of special education practitioners (i.e., speech-language pathologists, special educators, para-educators, and other related service providers) on their role as communication partners after participation in the Social Communication and Engagement Triad (Buckley et al., 2015 ) yearlong professional learning program. Method A qualitative approach using interviews and purposeful sampling was used. A total of 22 participants who completed participation in either Year 1 or Year 2 of the program were interviewed. Participants were speech-language pathologists, special educators, para-educators, and other related service providers. Using a grounded theory approach (Glaser & Strauss, 1967 ) to data analysis, open, axial, and selective coding procedures were followed. Results Three themes emerged from the data analysis and included engagement as the goal, role as a communication partner, and importance of collaboration. Conclusions Findings supported the notion that educators see the value of an integrative approach to service delivery, supporting students' social communication and engagement across the school day but also recognizing the challenges they face in making this a reality.

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