| Records |
| Author |
Nievas Rosillo, M. |
| Title |
Absolute photometry and Night Sky Brightness with all-sky cameras |
Type |
Report |
| Year |
2013 |
Publication |
e-prints Complutense |
Abbreviated Journal |
e-prints Complutense |
| Volume |
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Issue |
24626 |
Pages |
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| Keywords |
Instrumentation; skyglow; measurement; modeling |
| Abstract |
All-sky cameras have proven to be powerful tools to continuously monitoring the sky in a wide range of fields in both Astrophysics and Meteorology. In this work, we have developed a complete software pipeline to analyze the night CCD images obtained with one of such systems. This let us to study typical parameters used in Astrophysics to characterize the night sky quality, such as the Sky Brightness, the Cloud Coverage and the Atmospheric Extinction, how they evolve over the time and their variability. Using our software, we analyzed a large set of data from AstMon-OT all-sky camera at Teide Observatory. Results from this work have been applied in the support to the spanish CTA site proposal at Izaña, Tenerife and are being discussed within the CTA consortium. A comparison with data from other devices that have been used in site characterization such as the IAC80 telescope is also presented. This comparison is used to validate the results of the analysis of all-sky images. Finally, we test our software with AstMon-UCM and DSLR cameras. Some general recommendations for the use of DSLR cameras are provided. |
| Address |
Departamento de Astrofísica y Ciencias de la Atmosfera, Universidad Complutense de Madrid, Madrid, Spain |
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Thesis |
Master's thesis |
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Place of Publication |
Madrid |
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| Language |
English |
Summary Language |
English |
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e-prints Complutense |
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IDA @ john @ |
Serial |
1437 |
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| Author |
Femia, N.; Fortunato, M.; Vitelli, M. |
| Title |
Light-to-Light: PV-Fed LED Lighting Systems |
Type |
Journal Article |
| Year |
2013 |
Publication |
IEEE Transactions on Power Electronics |
Abbreviated Journal |
IEEE Trans. Power Electron. |
| Volume |
28 |
Issue |
8 |
Pages |
4063-4073 |
| Keywords |
light-to-light systems; outdoor lighting; lighting technology; LED; LED lighting; photovoltaics; PV |
| Abstract |
This paper discusses the principle of operation, dynamic modeling, and control design for light-to-light (LtL) systems, whose aim is to directly convert the sun irradiation into artificial light. The system discussed in this paper is composed by a photovoltaic (PV) panel, an LED array, a dc-dc converter dedicated to the maximum power point tracking of the PV panel and a dc-dc converter dedicated to drive the LEDs array. A system controller is also included, whose goal is to ensure the matching between the maximum available PV power and the LED power by means of a low-frequency LEDs dimming. An experimental design example is discussed to illustrate the functionalities of the LtL system. |
| Address |
Dipt. di Ing. Elettron. e Ing. Inf., Univ. of Salerno, Salerno, Italy |
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0885-8993 |
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IDA @ john @ |
Serial |
331 |
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| Author |
Schnitt, S.; Ruhtz, T.; Fischer, J.; Hölker, F.; Kyba, C.C.M. |
| Title |
Temperature stability of the sky quality meter |
Type |
Journal Article |
| Year |
2013 |
Publication |
Sensors (Basel, Switzerland) |
Abbreviated Journal |
Sensors (Basel) |
| Volume |
13 |
Issue |
9 |
Pages |
12166-12174 |
| Keywords |
*Artifacts; Atmosphere/*analysis; Environmental Monitoring/*instrumentation; Equipment Design; Equipment Failure Analysis; Photometry/*instrumentation; Reproducibility of Results; Sensitivity and Specificity; Temperature; *Transducers; Sky Quality Meter; SQM |
| Abstract |
The stability of radiance measurements taken by the Sky Quality Meter (SQM)was tested under rapidly changing temperature conditions during exposure to a stable light field in the laboratory. The reported radiance was found to be negatively correlated with temperature, but remained within 7% of the initial reported radiance over a temperature range of -15 degrees C to 35 degrees C, and during temperature changes of -33 degrees C/h and +70 degrees C/h.This is smaller than the manufacturer's quoted unit-to-unit systematic uncertainty of 10%,indicating that the temperature compensation of the SQM is adequate under expected outdoor operating conditions. |
| Address |
Institute for Space Sciences, Freie Universitat Berlin, Carl-Heinrich-Becker-Weg 6-10, Berlin 12165, Germany. christopher.kyba@wew.fu-berlin.de |
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English |
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1424-8220 |
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| Notes |
PMID:24030682; PMCID:PMC3821345 |
Approved |
no |
| Call Number |
IDA @ john @ |
Serial |
194 |
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| Author |
Baugh, K.; Hsu, F.-C.; Elvidge, C.D.; Zhizhin, M. |
| Title |
Nighttime Lights Compositing Using the VIIRS Day-Night Band: Preliminary Results |
Type |
Journal Article |
| Year |
2013 |
Publication |
Proceedings of the Asia-Pacific Advanced Network |
Abbreviated Journal |
APAN Proceedings |
| Volume |
35 |
Issue |
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Pages |
70 |
| Keywords |
remote sensing; light pollution; VIIRS; satellite; radiometry |
| Abstract |
Dramatically improved nighttime lights capabilities are presented by the launch of the National Polar-orbiting Partnership (NPP) Visible Infrared Imaging Radiometer Suite (VIIRS) Day Night Band (DNB) sensor. Building on 18 years of experience compositing nighttime data from the Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS), NOAA’s NGDC Earth Observation Group has started adapting their algorithms to process these new data. The concept of compositing nighttime data comprises combining only high quality data components over a period of time to improve sensitivity and coverage. For this work, flag image are compiled to describe image quality. The flag categories include: daytime, twilight, stray light, lunar illuminance, noisy edge of scan data, clouds, and no data. High quality data is defined as not having any of these attributes present. Two methods of reprojection are necessary due to data collection characteristics. Custom algorithms have been created to terrain-correct and reproject all data to a common 15 arc second grid. Results of compositing over two time periods in 2012 are presented to demonstrate data quality and initial capabilities. These data can be downloaded at http://www.ngdc.noaa.gov/eog/viirs/downloadviirsntl.html. |
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2227-3026 |
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no |
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IDA @ john @ |
Serial |
197 |
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| Author |
Elvidge, C.D.; Baugh, K.E.; Zhizhin, M.; Hsu, F.-C. |
| Title |
Why VIIRS data are superior to DMSP for mapping nighttime lights |
Type |
Journal Article |
| Year |
2013 |
Publication |
Proceedings of the Asia-Pacific Advanced Network |
Abbreviated Journal |
APAN Proceedings |
| Volume |
35 |
Issue |
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Pages |
62 |
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| Abstract |
For more than forty years the U.S. Air Force Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS) has been the only satellite system collecting global low-light imaging data. A series of twenty-four DMSP satellites have collected low-light imaging data. The design of the OLS has not changed significantly since satellite F-4 flew in the late 1970’s and OLS data have relatively coarse spatial resolution, limited dynamic range, and lack in-flight calibration. In 2011 NASA and NOAA launched the Suomi National Polar Partnership (SNPP) satellite carrying the first Visible Infrared Imaging Radiometer Suite (VIIRS) instrument. The VIIRS collects low light imaging data and has several improvements over the OLS’ capabilities. In this paper we contrast the nighttime low light imaging collection capabilities of these two systems and compare their data products. |
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2227-3026 |
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IDA @ john @ |
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198 |
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