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Letteratura scientifica selezionata sul tema "Techniques: photometric"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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Articoli di riviste sul tema "Techniques: photometric"

Tinbergen, Jaap. "New Techniques." International Astronomical Union Colloquium 136 (1993): 130–46. http://dx.doi.org/10.1017/s025292110000748x.

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AbstractRoutine millimagnitude photometry may require a new approach to reduction of photometric errors. Such an approach is outlined in this paper; it stresses elimination of each error as close to its source as possible. The possibilities provided by modern technology are reviewed in this light. An engineering design group dedicated to photometry is a prerequisite and an on-site photometric technician may be necessary. In this concept, observers are mainly remote users of a database. Implied is the idea of accurate photometry necessarily developing into a single but multi-site astronomical f

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Walker, Alistair, Saul Adelman, Eugene Milone, et al. "DIVISION B COMMISSION 25: ASTRONOMICAL PHOTOMETRY AND POLARIMETRY." Proceedings of the International Astronomical Union 11, T29A (2015): 159–70. http://dx.doi.org/10.1017/s1743921316000727.

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Commission 25 (C25) deals with the techniques and issues involved with the measurement of optical and infrared radiation intensities and polarization from astronomical sources. As such, in recent years attention has focused on photometric standard stars, atmospheric extinction, photometric passbands, transformation between systems, nomenclature, and observing and reduction techniques. At the start of the trimester C25 changed its name from Stellar Photometry and Polarization to Astronomical Photometry and Polarization so as to explicitly include in its mandate particular issues arising from th

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Davies, L. J. M., J. E. Thorne, A. S. G. Robotham, et al. "Deep Extragalactic VIsible Legacy Survey (DEVILS): consistent multiwavelength photometry for the DEVILS regions (COSMOS, XMMLSS, and ECDFS)." Monthly Notices of the Royal Astronomical Society 506, no. 1 (2021): 256–87. http://dx.doi.org/10.1093/mnras/stab1601.

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ABSTRACT The Deep Extragalactic VIsible Legacy Survey (DEVILS) is an ongoing high-completeness, deep spectroscopic survey of ∼60 000 galaxies to Y &lt; 21.2 mag, over ∼6 deg2 in three well-studied deep extragalactic fields: D10 (COSMOS), D02 (XMMLSS), and D03 (ECDFS). Numerous DEVILS projects all require consistent, uniformly derived and state-of-the-art photometric data with which to measure galaxy properties. Existing photometric catalogues in these regions either use varied photometric measurement techniques for different facilities/wavelengths leading to inconsistencies, older imaging

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Goodeve, Joshua L. "Light Streak Photometry and Streaktools." Astronomical Journal 169, no. 3 (2025): 151. https://doi.org/10.3847/1538-3881/ada950.

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Abstract The accuracy of photometric calibration has gradually become a limiting factor in various fields of astronomy, limiting the scientific output of a host of research. Calibration using artificial light sources in low Earth orbit remains largely unexplored. Here, we demonstrate that photometric calibration using light sources in low Earth orbit is a viable and competitive alternative/complement to current calibration techniques, and explore the associated ideas and basic theory. We present the publicly available Python code Streaktools as a means to simulate and perform photometric calib

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Cabayol-Garcia, L., M. Eriksen, A. Alarcón, et al. "The PAU Survey: background light estimation with deep learning techniques." Monthly Notices of the Royal Astronomical Society 491, no. 4 (2019): 5392–405. http://dx.doi.org/10.1093/mnras/stz3274.

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ABSTRACT In any imaging survey, measuring accurately the astronomical background light is crucial to obtain good photometry. This paper introduces BKGnet, a deep neural network to predict the background and its associated error. BKGnet has been developed for data from the Physics of the Accelerating Universe Survey (PAUS), an imaging survey using a 40 narrow-band filter camera (PAUCam). The images obtained with PAUCam are affected by scattered light: an optical effect consisting of light multiply reflected that deposits energy in specific detector regions affecting the science measurements. Fo

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Lee, Bomee, and Ranga-Ram Chary. "Improved photometric redshifts with colour-constrained galaxy templates for future wide-area surveys." Monthly Notices of the Royal Astronomical Society 497, no. 2 (2020): 1935–45. http://dx.doi.org/10.1093/mnras/staa2100.

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ABSTRACT Cosmology and galaxy evolution studies with LSST, Euclid, and Roman, will require accurate redshifts for the detected galaxies. In this study, we present improved photometric redshift estimates for galaxies using a template library that populates three-colour space and is constrained by HST/CANDELS photometry. For the training sample, we use a sample of galaxies having photometric redshifts that allows us to train on a large, unbiased galaxy sample having deep, unconfused photometry at optical-to-mid infrared wavelengths. Galaxies in the training sample are assigned to cubes in 3D col

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Rau, M. M., C. B. Morrison, S. J. Schmidt, et al. "A composite likelihood approach for inference under photometric redshift uncertainty." Monthly Notices of the Royal Astronomical Society 509, no. 4 (2021): 4886–907. http://dx.doi.org/10.1093/mnras/stab3290.

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ABSTRACT Obtaining accurately calibrated redshift distributions of photometric samples is one of the great challenges in photometric surveys like LSST, Euclid, HSC, KiDS, and DES. We present an inference methodology that combines the redshift information from the galaxy photometry with constraints from two-point functions, utilizing cross-correlations with spatially overlapping spectroscopic samples, and illustrate the approach on CosmoDC2 simulations. Our likelihood framework is designed to integrate directly into a typical large-scale structure and weak lensing analysis based on two-point fu

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Zhang, Yan-Xia, and Yong-Heng Zhao. "Photometric Redshift Techniques in Big-data Era." Proceedings of the International Astronomical Union 11, S319 (2015): 57. http://dx.doi.org/10.1017/s1743921315009886.

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AbstractPhotometric data increase with large survey projects running. The huge volume of data influences the means and methods to deal with them. As such, the techniques of photometric redshift estimation based on photometric data must be developed and improved.

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Jeong, Hyeon, Soogyum Kim, Euijoon Lee, Hyunmin Ko, and Ho Lee. "Photometric Observations of Open Clusters Using Mobile Phone Camera." Korean Science Education Society for the Gifted 17, no. 1 (2025): 148–55. https://doi.org/10.29306/jseg.2025.17.1.148.

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This study explores the feasibility of conducting photometric observations using mobile phones in combination with small telescopes. For this study photometric observations of the open cluster M45 (Pleiades) were carried out using a mobile phone camera mounted on a small telescope. Due to the limited full well capacity of the mobile sensor, stacking multiple short-exposure images proved more effective than long-exposure imaging for determining the magnitudes of a greater number of stars. To place the data on a standard photometric scale, Bayer filter magnitudes derived from the mobile phone we

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Ackermann, Jens, and Michael Goesele. "A Survey of Photometric Stereo Techniques." Foundations and Trends® in Computer Graphics and Vision 9, no. 3-4 (2015): 149–254. http://dx.doi.org/10.1561/0600000065.

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Tesi sul tema "Techniques: photometric"

Domeniconi, Federico. "Deep Learning Techniques applied to Photometric Stereo." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20031/.

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La tesi si focalizza sullo studio dello stato dell’arte della fotometria stereo con deep learning: Self-calibrating Deep Photometric Stereo Networks. Il modello è composto è composto di due reti, la prima predice la direzione e l’intensità delle luci, la seconda predice le normali della superficie. L’obiettivo della tesi è individuare i limiti del modello e capire se possa essere modifcato per avere buone prestazioni anche in scenari reali. Il progetto di tesi è basato su fine-tuning, una tecnica supervisionata di transfer learning. Per questo scopo un nuovo dataset è stato creato acquisendo i

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Bezanson, Rachel, David A. Wake, Gabriel B. Brammer, et al. "LEVERAGING 3D-HST GRISM REDSHIFTS TO QUANTIFY PHOTOMETRIC REDSHIFT PERFORMANCE." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/621218.

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We present a study of photometric redshift accuracy in the 3D-HST photometric catalogs, using 3D-HST grism redshifts to quantify and dissect trends in redshift accuracy for galaxies brighter than JH(IR) > 24 with an unprecedented and representative high-redshift galaxy sample. We find an average scatter of 0.0197 +/- 0.0003(1 + z) in the Skelton et al. photometric redshifts. Photometric redshift accuracy decreases with magnitude and redshift, but does not vary monotonically with color or stellar mass. The 1 sigma scatter lies between 0.01 and 0.03 (1 + z) for galaxies of all masses and colors

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Zou, Hu, Tianmeng Zhang, Zhimin Zhou, et al. "The First Data Release of the Beijing-Arizona Sky Survey." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/624694.

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The Beijing-Arizona Sky Survey (BASS) is a new wide-field legacy imaging survey in the northern Galactic cap using the 2.3 m Bok telescope. The survey will cover about 5400 deg(2) in the g and r bands, and the expected 5 sigma depths (corrected for the Galactic extinction) in these two bands are g = 24.0 and r = 23.4 mag (AB magnitude). BASS started observations in 2015 January. and had. completed about 41% of the. area as of 2016 July. The first data release contains calibrated images obtained in 2015 and 2016 and their corresponding single-epoch. and coadded catalogs. The actual depths of th

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Stritzinger, Maximilian. "Type Ia supernovae bolometric properties and new tools for photometric techniques /." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=979066697.

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Mason, Justin R. "In search of red dwarf stars application of three-color photometric techniques /." Muncie, IN : Ball State University, 2009. http://cardinalscholar.bsu.edu/659.

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Toyozumi, Hiroyuki Physics Faculty of Science UNSW. "The intra-pixel sensitivity variation of a CCD." Awarded by:University of New South Wales. School of Physics, 2005. http://handle.unsw.edu.au/1959.4/25995.

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The effect of Intra-pixel sensitivity variation (IPSV) in charge-coupled devices (CCDs) can be important in astronomical applications. This thesis studies the IPSV in a front-illuminated three-phase EEV05-20 CCD used in the Automated Patrol Telescope (APT), from multiple points of view. To explore the detailed sensitivity variation within pixels, the CCD was scanned using a 4 \mu meter diameter light beam in four colour bands: B, V, R and I. The resulting images clearly show the IPSVs due to the CCD electrode structure, and its dependence on wavelength. Unexpected ghost images appear in the s

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Li, Linlin, Shiyin Shen, Jinliang Hou, et al. "GALACTIC EXTINCTION AND REDDENING FROM THE SOUTH GALACTIC CAP u -BAND SKY SURVEY: u -BAND GALAXY NUMBER COUNTS AND u − r COLOR DISTRIBUTION." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/623264.

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We study the integral Galactic extinction and reddening based on the galaxy catalog of the South Galactic Cap u-band Sky Survey (SCUSS), where u-band galaxy number counts and u - r color distribution are used to derive the Galactic extinction and reddening respectively. We compare these independent statistical measurements with the reddening map of Schlegel et al. (SFD) and find that both the extinction and reddening from the number counts and color distribution are in good agreement with the SFD results at low extinction regions (E(B - V)(SFD) < 0.12 mag). However, for high extinction regions

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Cartwright, Stephen J. "Application of digital image processing techniques to the photometric testing of vehicle headlamps." Thesis, Aston University, 1986. http://publications.aston.ac.uk/14614/.

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The aim of this Interdisciplinary Higher Degrees project was the development of a high-speed method of photometrically testing vehicle headlamps, based on the use of image processing techniques, for Lucas Electrical Limited. Photometric testing involves measuring the illuminance produced by a lamp at certain points in its beam distribution. Headlamp performance is best represented by an iso-lux diagram, showing illuminance contours, produced from a two-dimensional array of data. Conventionally, the tens of thousands of measurements required are made using a single stationary photodetector and

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Christiansen, Jessie L., Andrew Vanderburg, Jennifer Burt, et al. "Three’s Company: An Additional Non-transiting Super-Earth in the Bright HD 3167 System, and Masses for All Three Planets." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/625817.

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HD 3167 is a bright (V = 8.9), nearby KO star observed by the NASA K2 mission (EPIC 220383386), hosting two small, short-period transiting planets. Here we present the results of a multi-site, multi-instrument radial-velocity campaign to characterize the HD 3167 system. The masses of the transiting planets are 5.02 +/- 0.38 M-circle plus for HD 3167 b, a hot super-Earth with a likely rocky composition (rho(b) = 5.6(-1.43)(+2.15) g cm(-3)), and 9.80(-1.24)(+1.30) M-circle plus for HD 3167 c, a warm sub-Neptune with a likely substantial volatile complement (rho(c) = 1.97(-0.59)(+0.94) g cm(-3)).

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Stefansson, Gudmundur, Suvrath Mahadevan, Leslie Hebb, et al. "Toward Space-like Photometric Precision from the Ground with Beam-shaping Diffusers." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/626043.

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We demonstrate a path to hitherto unachievable differential photometric precisions from the ground, both in the optical and near-infrared (NIR), using custom-fabricated beam-shaping diffusers produced using specialized nanofabrication techniques. Such diffusers mold the focal plane image of a star into a broad and stable top-hat shape, minimizing photometric errors due to non-uniform pixel response, atmospheric seeing effects, imperfect guiding, and telescope-induced variable aberrations seen in defocusing. This PSF reshaping significantly increases the achievable dynamic range of our observat

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Libri sul tema "Techniques: photometric"

Cartwright, Stephen John. Application of digital image processing techniques to the photometric testing of vehicle headlamps. Aston University. Department of Vision Sciences, 1986.

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United States. National Aeronautics and Space Administration., ed. Infrared imaging, spectroscopic, & photometric studies of comets: Final report, NASA/NAGW-2324. National Aeronautics and Space Administration, 1997.

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Narayanan, Ramachandran, and George C. Marshall Space Flight Center., eds. A photometric technique for determining fluid concentration using consumer-grade hardware. National Aeronautics and Space Administration, Marshall Space Flight Center, 1999.

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IAU Colloquium (136th 1992 Dublin, Ireland). Stellar photometry: Current techniques and future developments : proceedings of the IAU Colloquium no. 136 held in Dublin, Ireland, 4-7 August 1992. Cambridge University Press, 1993.

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Nicolau, Dan V., Daniel L. Farkas, and Robert C. Leif. Imaging, manipulation, and analysis of biomolecules, cells, and tissues X: 21-23 January 2012, San Francisco, California, United States. SPIE, 2012.

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Parr, A. C. A national measurement system for radiometry, photometry, and pyrometry based upon absolute detectors. U.S. Department of Commerce, Technology Administration, National Institute of Standards and Technology, 1996.

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United States. National Aeronautics and Space Administration., ed. Development of the MAMA detectors for the Hubble Space Telescope imaging spectrograph: Final report for NASA contract NAS5-29389. Center for Space Science and Astrophysics, Stanford University, 1997.

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Gerard, Marriott, and Parker Ian, eds. Methods in enzymology. Academic, 2003.

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J, Butler C., and Elliott I. 1936-, eds. Stellar photometry: Current techniques and future developments : proceedings of the IAU Colloquium no. 136 held in Dublin, Ireland, 4-7 August 1992. Cambridge University Press, 1993.

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Capitoli di libri sul tema "Techniques: photometric"

Schneider, J. "Photometric Search for Extrasolar Planets." In The Search for Extra-Solar Terrestrial Planets: Techniques and Technology. Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-011-5808-4_3.

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Ohmori, Harunori. "Photometric Patch Electrode to Simultaneously Measure Neural Electrical Activity and Optical Signal in the Brain Tissue." In Basic Neurobiology Techniques. Springer US, 2019. http://dx.doi.org/10.1007/978-1-4939-9944-6_6.

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Lapasset, E., M. Gomez, and R. Fariñas. "Test of the Optimization Techniques for the Photometric Analysis of Contact Binaries." In Evolutionary Processes in Interacting Binary Stars. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2542-0_55.

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Vetrekar, N. T., R. Raghavendra, R. S. Gad, and G. M. Naik. "Photometric Normalization Techniques for Extended Multi-spectral Face Recognition: A Comparative Analysis." In Computer Vision, Graphics, and Image Processing. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68124-5_3.

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Kitchin, C. R. "Photometry." In Astrophysical Techniques. CRC Press, 2020. http://dx.doi.org/10.1201/9780429491139-3.

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Kitchin, Christopher Robert. "Photometry." In Telescopes and Techniques. Springer London, 1995. http://dx.doi.org/10.1007/978-1-4471-3370-4_11.

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Kitchin, Chris. "Photometry." In Telescopes and Techniques. Springer London, 2003. http://dx.doi.org/10.1007/978-1-4471-0023-2_11.

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Kitchin, C. R. "Photometry." In Telescopes and Techniques. Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-4891-4_11.

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Høg, E. "Tycho Astrometry and Photometry." In Astrometric Techniques. Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4676-7_78.

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Dymock, Roger. "Lightcurve Photometry Tools and Techniques." In Astronomers' Observing Guides. Springer New York, 2010. http://dx.doi.org/10.1007/978-1-4419-6439-7_12.

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Atti di convegni sul tema "Techniques: photometric"

Al-Qallaf, Mohammed S., and Said S. Al-Jaroudi. "Corrosion Related Gas Compressor Vibration (Case Study)." In CORROSION 2011. NACE International, 2011. https://doi.org/10.5006/c2011-11355.

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Abstract This paper presents a case study of corrosion related gas compressor vibration problem observed at one of Saudi Aramco gas compression plants. Investigation revealed that the high vibration was mainly due to corrosion product deposition on the compressor internals. Accumulation of the solids on the compressor rotor caused high vibration and consequently tripped the compressor. The corrosion products were characterized by photometric and potentiometric analyses, Inductive Couple Plasma (ICP), X-ray Diffraction (XRD) and their morphology was observed by Scanning Electron Microscopy (SEM

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Hartley, Kathryn E., James Osborn, Domenico Bonaccini Calia, et al. "Using LGS to calibrate scintillation for time resolved photometry." In Propagation Through and Characterization of Atmospheric and Oceanic Phenomena. Optica Publishing Group, 2024. http://dx.doi.org/10.1364/pcaop.2024.pf4e.2.

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We present a new technique to correct photometric noise produced by atmospheric effects by using a laser guide star, projected along the same line of sight as the astronomical target, as a comparison star.

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Kearns, J. R., L. R. Barkowski, M. J. Johnson, and P. J. Pavlik. "The Corrosion and Appearance of Stainless Steels in the Atmosphere." In CORROSION 1987. NACE International, 1987. https://doi.org/10.5006/c1987-87418.

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Abstract The resistance of 38 types of stainless steel to degradation in the atmosphere was directly related to alloy chromium and molybdenum contents by spectrocol-ormetric measurements and a visual rating system. Only AISI Type 410 showed any signs of corrosion in a semirural environment. Significant corrosion product staining occurred on all non-molybdenum-bearing stainless grades that had been exposed for 2 to 15 years at the 250-m lot on Kure Beach, N.C. Stainless grades that had been sensitized by an autogenous welding operation were susceptible to preferential corrosion at weld and heat

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Broussard, Zach, Timothy J. Tidwell, Renato De Paula, and Victor Keasler. "Determining Biocide Selection and Dosage Recommendation via Planktonic and Sessile Kill Studies and Subsequent Biofilm Regrowth: a Case Study." In CORROSION 2017. NACE International, 2017. https://doi.org/10.5006/c2017-09802.

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Abstract A three-phase production system in the North Sea was experiencing multiple leaks in the topside separation facilities. A root cause analysis, using a combination of ATP photometry and DNA-based techniques, was performed and the underlying source responsible for the failures was determined to be microbially influenced corrosion. To control the microbial contamination in the system, an initial planktonic kill study was performed to select the best possible biocides to provide immediate microbial mitigation to the field. Upon implementation, resulting field data indicated effective initi

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Zheng, Hongwen, and Yanxia Zhang. "Review of techniques for photometric redshift estimation." In SPIE Astronomical Telescopes + Instrumentation, edited by Nicole M. Radziwill and Gianluca Chiozzi. SPIE, 2012. http://dx.doi.org/10.1117/12.925314.

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Hashimoto, Naoki, and Koki Kosaka. "Continuous photometric compensation for deformable objects." In SIGGRAPH '17: Special Interest Group on Computer Graphics and Interactive Techniques Conference. ACM, 2017. http://dx.doi.org/10.1145/3102163.3102167.

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Turri, Paolo, Alan W. McConnachie, Peter B. Stetson, et al. "Photometric techniques, performance and PSF characterization of GeMS." In SPIE Astronomical Telescopes + Instrumentation, edited by Enrico Marchetti, Laird M. Close, and Jean-Pierre Véran. SPIE, 2016. http://dx.doi.org/10.1117/12.2233109.

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Vo, Quang Nhat, Anh Khoa Tran, and Gueesang Lee. "Illumination Invariant L1 Tracker Using Photometric Normalization Techniques." In 2013 2nd IAPR Asian Conference on Pattern Recognition (ACPR). IEEE, 2013. http://dx.doi.org/10.1109/acpr.2013.104.

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Zwinkels, Joanne C. "Issues and Strategies for Improving Measurement Uncertainties for Solid-State Lighting." In NCSL International Workshop & Symposium. NCSL International, 2016. http://dx.doi.org/10.51843/wsproceedings.2016.23.

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The use of solid-state lighting (SSL), such as light-emitting-diode (LED) products for general lighting and display applications, has increased dramatically over the past decade. However, there are significant photometric and radiometric metrological challenges with this new lighting technology. The photometric procedures and standards that have been developed for traditional lighting products, such as incandescent and compact fluorescent (CFL) lamps, do not work well for LEDs because they exhibit significantly different characteristics. This paper will discuss these differences in the spectra

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Hashimoto, Naoki, and Koki Kosaka. "Photometric compensation for practical and complex textures." In SIGGRAPH '15: Special Interest Group on Computer Graphics and Interactive Techniques Conference. ACM, 2015. http://dx.doi.org/10.1145/2787626.2787647.

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Rapporti di organizzazioni sul tema "Techniques: photometric"

Jackson, Bernard V., Andrew Buffington, and P. P. Hick. Development of Data Analysis Techniques to Provide Photometric Images for a Heliospheric Imager. Defense Technical Information Center, 2008. http://dx.doi.org/10.21236/ada519141.

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Stubbs, Christopher. Developing the Optimal Technique for Cluster Photometric Redshift Determination: An Essential Ingredient in Measuring Dark Energy with Cluster Abundances. Office of Scientific and Technical Information (OSTI), 2009. http://dx.doi.org/10.2172/951183.

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Delwiche, Michael, Boaz Zion, Robert BonDurant, Judith Rishpon, Ephraim Maltz, and Miriam Rosenberg. Biosensors for On-Line Measurement of Reproductive Hormones and Milk Proteins to Improve Dairy Herd Management. United States Department of Agriculture, 2001. http://dx.doi.org/10.32747/2001.7573998.bard.

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The original objectives of this research project were to: (1) develop immunoassays, photometric sensors, and electrochemical sensors for real-time measurement of progesterone and estradiol in milk, (2) develop biosensors for measurement of caseins in milk, and (3) integrate and adapt these sensor technologies to create an automated electronic sensing system for operation in dairy parlors during milking. The overall direction of research was not changed, although the work was expanded to include other milk components such as urea and lactose. A second generation biosensor for on-line measuremen

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