scholarly journals MOCAM: A 4k × 4k CCD Mosaic for the Canada-France-Hawaii Telescope Prime Focus

1995 ◽  
Vol 167 ◽  
pp. 213-220
Author(s):  
J. C. Cuillandre ◽  
Y. Melliers ◽  
R. Murowinski ◽  
D. Crampton ◽  
G. Luppino ◽  
...  
Keyword(s):  
Focal Plane ◽  
San Diego ◽  
Ccd Camera ◽  
Astronomical Observatory ◽  
Wide Field ◽  
On Line ◽  
Readout Noise ◽  
The University ◽  
Filter Wheel ◽  
Better Than

MOCAM is a wide field CCD camera, currently nearing completion, which will be offered to the Canada-France-Hawaii Telescope (CFHT) user community in 1995. The project is a collaboration between the CFHT, the Dominion Astronomical Observatory (DAO, Canada), the Institut des Sciences de l'Univers (INSU, France), Laboratoire d'Astrophysique de Toulouse (LAT, France) and the University of Hawaii (UH). In the interests of producing a reliable and effective camera in the shortest time, it was decided to use existing technologies rather than innovative ones. Two-edge buttable 2048 × 2048 15 μm pixel CCDs were obtained from the LORAL aerospace foundry, based on a mask designed by J. Geary at Smithsonian Astrophysical Observatory (SAO). They are mounted in a dewar designed by G. Luppino (UH); the focal plane mounting keeps the mosaic flat to within two pixels and the CCDs are aligned to within two pixels. A mechanical interface designed and fabricated by the DAO holds a 150 mm shutter and a filter wheel which has a positioning repeatability better than five μm.The four CCDs are operated in parallel by a San Diego GenIII controller adapted by LAT. The mosaic is read out in seven minutes and a single 33 Mb FITS file is generated to enable convenient on-line preprocessing. The user will control the system through a single CFHT Pegasus environment session. The camera field is 14′ × 14′ with a 0.″2 pixel sampling and the readout noise is less than seven electrons. The scientific goals of the initiators of the project are studies of distant clusters, deep galaxy counts and quasars surveys.

scholarly journals Solar observations at the Coimbra Astronomical Observatory

2019 ◽  
Vol 28 (1) ◽  
pp. 165-179 ◽  
Author(s):  
Ana Lourenço ◽  
Sara Carvalho ◽  
Teresa Barata ◽  
Adriana Garcia ◽  
Víctor Carrasco ◽  
...  
Keyword(s):  
Ccd Camera ◽  
Astronomical Observatory ◽  
Photographic Emulsion ◽  
Digital Recording ◽  
Solar Observations ◽  
Synoptic Observations ◽  
Data Collections ◽  
The University ◽  
Near Future

Abstract In 2020, the Geophysical and Astronomical Observatory of the University of Coimbra will celebrate the 95th anniversary of its first spectroheliographic observation. Keeping a daily service of solar observations since then, making almost a century, led to one of the largest continuous solar data collections in the world. This long–term solar database is essential for studies where solar activity is involved. This work reviews the development of synoptic observations made at the Observatory of Coimbra since 1925 and presents a summary of some of the principal stages of the Observatory’s history since its founding in 1772. We refer the main technical improvements and present some perspectives for the near future. One of the most significant upgrades was the installation of a CCD camera in 2007. The transition from photographic emulsion to digital recording methods allowed the development of image analysis algorithms to process solar images and improved data sharing with other institutions. This upgrade enabled also to carry–out modern climate and space weather studies. This valuable advancement makes it possible to create a new catalogue of solar observations to be published in the future.

Operational Performance of the University of Minnesota 45kWe High-Flux Solar Simulator

2012 ◽  
Author(s):  
Katherine R. Krueger ◽  
Wojciech Lipiński ◽  
Jane H. Davidson
Keyword(s):  
Heat Flux ◽  
Focal Plane ◽  
Flux Distribution ◽  
Spectral Characteristics ◽  
Ccd Camera ◽  
Optical Filters ◽  
High Flux ◽  
University Of Minnesota ◽  
Solar Simulator ◽  
The University

This paper presents measured performance of the University of Minnesota’s 45 kWe indoor high-flux solar simulator. The simulator consists of seven radiation units, each comprised of a 6.5 kWe xenon short arc lamp coupled to a reflector in the shape of a truncated ellipsoid of revolution. Data include flux distribution at the focal plane for all seven radiation units operating in tandem and for individual radiation units. The flux distribution is measured optically by acquiring the image of radiation reflected from a Lambertian target with a CCD camera equipped with neutral density optical filters. The CCD camera output is calibrated to irradiation using a circular foil heat flux gage. It is shown that accurate calibration of the heat flux gage must account for its response to the spectral characteristics of the radiation source. The simulator delivers radiative power of approximately 9.2 kW over a 60-mm diameter circular area located in the focal plane, corresponding to an average flux of 3.2 MW m−2, with a peak flux of 7.3 MW m−2.

scholarly journals Astronomical station Vidojevica: In situ test of the ALTA Apogee U42 CCD camera

2012 ◽  
pp. 65-74
Author(s):  
O. Vince
Keyword(s):  
Ccd Camera ◽  
Astronomical Observatory ◽  
In Situ Test ◽  
Readout Noise ◽  
Astronomical Station

Currently, the CCD camera most used by observers of the Astronomical Observatory of Belgrade is the ALTA Apogee U42. It is used for both photometric and astrometric observations. Therefore, it is very important to know different measurable parameters which describe the condition of the camera - linearity, gain, readout noise etc. In this paper, we present a thorough test of this camera.

Preliminary Results from the Automated Patrol Telescope CCD Camera

1990 ◽  
Vol 8 (04) ◽  
pp. 377-380 ◽  
Author(s):  
P. W. Brooks
Keyword(s):  
Dark Current ◽  
Ccd Camera ◽  
Low Noise ◽  
Wide Field ◽  
Unique Combination ◽  
Schmidt Telescope ◽  
Charge Coupled Device ◽  
Analog To Digital ◽  
Correlated Double Sampling ◽  
The University

Abstract The University of NSW Automated Patrol Telescope (APT), a modified 0.5 m Baker-Nunn Schmidt telescope situated at Siding Spring Observatory, Coonabarabran, Australia, was opened in June 1989. It features the unique combination of an extremely fast (f/1) optical system with a CCD (Charge-Coupled Device) camera at the prime focus, capable of both fast (50 Hz TV-rate) imaging and slow-scan integrated readout via a low noise Correlated Double Sampling amplifier. This combination of optics and detector gives a wide field (0.9° × 1.4°) suited to observing extended objects including the LMC, SMC and galaxies in the Sculptor group. First images from the APT are presented along with the results of noise, linearity and dark current measurements made to date with a 12-bit analog-to-digital converter. Results were (ADU = Analog-Digital Unit):

A Combined Infrared/Visible Photoemission Microscope

1999 ◽  
Author(s):  
A.D. Trigg
Keyword(s):  
Integrated Circuit ◽  
Focal Plane ◽  
Mercury Cadmium Telluride ◽  
Forward Bias ◽  
Ccd Camera ◽  
Electronics Packaging ◽  
Charge Coupled Device ◽  
Visible Part ◽  
Intensified Charge Coupled Device ◽  
Filter Wheel

Abstract The photoemission microscope (PEM) is a powerful and widely used tool for location and identification of failure sites on integrated circuit (IC) chip and wafers. A PEM operating in the infrared (IRPEM) offers several advantages over systems operating in the visible part of the spectrum.. A combined PEM/IRPEM has been built having a cooled (77K) mercury cadmium telluride (MCT) focal plane array (FPA) sensitive in the range 800 to 2500 nm, an intensified charge coupled device (CCD) camera sensitive in the range 350 to 900 nm and a conventional, colour CCD camera. A cooled filter wheel enables the user to select the spectral range of the FPA. Direct comparison of photoemission images obtained in the IR and visible parts of the spectrum is straightforward, while the colour camera permits easy navigation around the device and facilitates probing of wafers. Comparing the sensitivity of the IRPEM with a conventional PEM camera (GEN III intensifier) indicates that for forward bias emission and NMOS emission the IRPEM is approximately 500 times more sensitive. Applications of the system to failure analysis in ICs, sensor devices and electronics packaging are described.

scholarly journals Practicum Evaluation of Degrees of Teaching in Primary and Childhood Education in Teruel (Spain) in the face of a coordinated management experience between the university and the educational administration

2019 ◽  
Vol 22 (2) ◽  
Author(s):  
Adrián Ponz Miranda ◽  
Alberto Abarca Sos ◽  
Rosario Marta Ramo Garzarán
Keyword(s):  
Educational Administration ◽  
Childhood Education ◽  
The Face ◽  
On Line ◽  
Management Experience ◽  
Line Survey ◽  
University Lecturers ◽  
The University ◽  
Work Done ◽  
Better Than

El Prácticum es considerado como un proceso esencial en la formación del futuro docente. En este trabajo se muestra la valoración ejercida por los tres agentes participantes, maestros/as, estudiantes y profesorado universitario, tras un acuerdo de mejora organizativa entre la administración educativa y la universidad. Los estudiantes valoran mejor la labor realizada por su maestro/a tutor/a que la ejercida por su profesor/a tutor/a universitario/a. Los/as maestros/as tutores/as y el profesorado universitario solicitan un mayor reconocimiento (incentivos) por parte de las instituciones responsables, administración educativa y universidad, que deben proporcionar más medios si realmente desean mejorar la formación de nuestro profesorado. Practicum is seen as an essential part of the training of future teachers. This paper shows the results of an assessment of the whole module following an on-line survey involving the three participating agents (i.e. school teachers, students and university lecturers). This was inspired by a joint endeavour to enhance and strengthen the communication and cooperation between the educational administrations and the university. Students value the work done by their school mentor better than that of their university mentor. Both school and university mentors ask for greater recognition (incentives) from the responsible institutions, educational administration and university, all of which must provide more means if they really want to improve the training of pre-service teachers.

Advances in imaging SIMS studies of stained and BrdU-labelled human metaphase chromosomes

1995 ◽  
Vol 53 ◽  
pp. 932-933
Author(s):  
R. Levi-Setti ◽  
J. M. Chabala ◽  
R. Espinosa ◽  
M. M. Le Beau
Keyword(s):  
High Performance ◽  
Secondary Ion Mass Spectrometry ◽  
Analytical Sensitivity ◽  
Metaphase Chromosomes ◽  
Banding Patterns ◽  
Sector Mass Spectrometer ◽  
Staining Methods ◽  
The University ◽  
Secondary Ion ◽  
Better Than

We have shown previously that isotope-labelled nucleotides in human metaphase chromosomes can be detected and mapped by imaging secondary ion mass spectrometry (SIMS), using the University of Chicago high resolution scanning ion microprobe (UC SIM). These early studies, conducted with BrdU- and 14C-thymidine-labelled chromosomes via detection of the Br and 28CN- (14C14N-> labelcarrying signals, provided some evidence for the condensation of the label into banding patterns along the chromatids (SIMS bands) reminiscent of the well known Q- and G-bands obtained by conventional staining methods for optical microscopy. The potential of this technique has been greatly enhanced by the recent upgrade of the UC SIM, now coupled to a high performance magnetic sector mass spectrometer in lieu of the previous RF quadrupole mass filter. The high transmission of the new spectrometer improves the SIMS analytical sensitivity of the microprobe better than a hundredfold, overcoming most of the previous imaging limitations resulting from low count statistics.

On-line alignment and astigmatism correction using a TV and personal computer

1993 ◽  
Vol 51 ◽  
pp. 202-203
Author(s):  
F. Hosokawa ◽  
Y. Kondo ◽  
T. Honda ◽  
Y. Ishida ◽  
M. Kersker
Keyword(s):  
High Resolution ◽  
Personal Computer ◽  
Block Diagram ◽  
Incident Beam ◽  
Ccd Camera ◽  
Alignment Procedure ◽  
Astigmatism Correction ◽  
Transmission Electron ◽  
Alignment System ◽  
On Line

High-resolution transmission electron microscopy must attain utmost accuracy in the alignment of incident beam direction and in astigmatism correction, and that, in the shortest possible time. As a method to eliminate this troublesome work, an automatic alignment system using the Slow-Scan CCD camera has been introduced recently. In this method, diffractograms of amorphous images are calculated and analyzed to detect misalignment and astigmatism automatically. In the present study, we also examined diffractogram analysis using a personal computer and digitized TV images, and found that TV images provided enough quality for the on-line alignment procedure of high-resolution work in TEM. Fig. 1 shows a block diagram of our system. The averaged image is digitized by a TV board and is transported to a computer memory, then a diffractogram is calculated using an FFT board, and the feedback parameters which are determined by diffractogram analysis are sent to the microscope(JEM- 2010) through the RS232C interface. The on-line correction system has the following three modes.

A Local Area Network for Medical Research; Planning, Realization and Experience

1991 ◽  
Vol 30 (01) ◽  
pp. 53-64 ◽  
Author(s):  
R. Schosser ◽  
C. Weiss ◽  
K. Messmer
Keyword(s):  
Medical Research ◽  
Word Processing ◽  
Local Area Network ◽  
Local Area ◽  
Area Network ◽  
Test Installation ◽  
Cost Performance ◽  
The Public ◽  
On Line ◽  
The University

This report focusses on the planning and realization of an interdisciplinary local area network (LAN) for medical research at the University of Heidelberg. After a detailed requirements analysis, several networks were evaluated by means of a test installation, and a cost-performance analysis was carried out. At present, the LAN connects 45 (IBM-compatible) PCs, several heterogeneous mainframes (IBM, DEC and Siemens) and provides access to the public X.25 network and to wide-area networks for research (EARN, BITNET). The network supports application software that is frequently needed in medical research (word processing, statistics, graphics, literature databases and services, etc.). Compliance with existing “official” (e.g., IEEE 802.3) and “de facto” standards (e.g., PostScript) was considered to be extremely important for the selection of both hardware and software. Customized programs were developed to improve access control, user interface and on-line help. Wide acceptance of the LAN was achieved through extensive education and maintenance facilities, e.g., teaching courses, customized manuals and a hotline service. Since requirements of clinical routine differ substantially from medical research needs, two separate networks (with a gateway in between) are proposed as a solution to optimally satisfy the users’ demands.

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