Bibliografie tematiche / Calibration

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Letteratura scientifica selezionata sul tema "Calibration"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 agosto 2024

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Articoli di riviste sul tema "Calibration"

Van De Voort, Frederick R., Abdel Aziz Elkashef e Jean-Simon Blais. "Interlaboratory Assessment of Dry Calibration Milk Powders for Calibrating Infrared Milk Analyzers". Journal of AOAC INTERNATIONAL 74, n. 5 (1 settembre 1991): 772–79. http://dx.doi.org/10.1093/jaoac/74.5.772.

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Abstract An interlaboratory study was carried out to assess the performance of preformulated, preanalyzed, dry calibration milk powders designed for calibrating infrared milk analyzers. The calibration powders can be reconstituted to produce consistent calibrations within laboratories. The powders met AOAC specifications In terms of accuracy and repeatability, and provide calibrations with performance characteristics comparable to those produced with conventional calibration milks. The reconstituted solutions were shown to be stable for up to 6 h at 40°C, and can be stored under refrigerated conditions and used for repeated analyses for up to 21 days without apparent deterioration In calibration performance. In general, the calibration powders perform as well as, or better than, the conventional calibrants used by the laboratories participating in the study, and the calibrations could be switched without significantly changing the analytical results. Simulation and cross-calibration analyses indicated that the powdered calibrants produced more consistent results overall than fluid calibration milks. The powdered calibrants, as formulated, are shown to be suitable for any application requiring calibrations that meet AOAC specifications, Including payment applications. The calibration powders have the stability and performance characteristics to serve as a consistent, stable reference standard for monitoring instrument performance, and would be a useful tool for Interlaboratory standardization or accrediting payment and dairy herd analysis laboratories.

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Tsuchida, Satoshi, Hirokazu Yamamoto, Toru Kouyama, Kenta Obata, Fumihiro Sakuma, Tetsushi Tachikawa, Akihide Kamei et al. "Radiometric Degradation Curves for the ASTER VNIR Processing Using Vicarious and Lunar Calibrations". Remote Sensing 12, n. 3 (29 gennaio 2020): 427. http://dx.doi.org/10.3390/rs12030427.

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The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) onboard Terra platform, which was launched in 1999, has three separate subsystems: a visible and near-infrared (VNIR) radiometer, a shortwave-infrared radiometer, and a thermal-infrared radiometer. The ASTER VNIR bands have been radiometrically corrected for approximately 14 years by the sensor degradation curves estimated from the onboard calibrator according to the original calibration plan. However, this calibration by the onboard calibrator encountered a problem; specifically, it is inconsistent with the results of vicarious calibration and cross calibration. Therefore, the ASTER VNIR processing was applied by the radiometric degradation curves calculated from the results of three calibration approaches, i.e., the onboard calibrator, the vicarious calibration, and the cross calibration since February 2014. Even though the current degradation curves were revised, the inter-band and lunar calibrations show some inconsistencies owing to the different traceability in the bands by different calibration approaches. In this study, the current degradation curves and their problems are explained, and the new curves that are derived from the vicarious calibration with lunar calibration are discussed. The new degradation curves that have the same traceability in the bands will be used for future ASTER VNIR processing.

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Ozdemir, Durmus, Matt Mosley e Ron Williams. "Hybrid Calibration Models: An Alternative to Calibration Transfer". Applied Spectroscopy 52, n. 4 (aprile 1998): 599–603. http://dx.doi.org/10.1366/0003702981943932.

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A new procedure for calibrating multiple instruments is presented in which spectra from each are used simultaneously during the construction of multivariate calibration models. The application of partial least-squares (PLS) and genetic regression (GR) to the problem of generating these hybrid calibrations is presented. Spectra of ternary mixtures of methylene chloride, ethyl acetate, and methanol were collected on a dispersive and a Fourier transform spectrometer. Calibration models were generated by using differing numbers of spectra from each instrument simultaneously in the calibration and prediction sets, and then validated by using a set of spectra from each instrument separately. Calibration models were found that perform well on both instruments, even when only a single spectrum from the second instrument was used during the calibration process. As a benchmark, comparison with PLS showed that GR is more effective than PLS in building these hybrid calibration models.

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Chen, Gang, Hua Chen, Yu Bo Guo e Dong Ye. "The Comparison of Two Stereo Vision Sensor Calibration Methods". Advanced Materials Research 317-319 (agosto 2011): 397–400. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.397.

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This paper presents and comparison two stereo vision sensor calibration methods: Volume template based calibration method and the calibration based on virtual stereo pattern. First method use a premade volume template. Second method use a group of random spatial points that are formed by an infrared LED moved with the probe of CMM. Two methods adopt an ideal pin-hole model that ignores the nonlinear distortion of the cameras. Through compare two calibratioin methods, we can draw conclusion that the first method can be applide to stereo sensor calibration in measurement field and the second method could gain higher calibrating precision.

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Harris, Richard W., e Robert C. Chanaud. "A Simplified Method for Calibrating a Sound-Level Meter for Use With a Brüel & Kjær Artificial Mastoid". American Journal of Audiology 7, n. 2 (ottobre 1998): 61–72. http://dx.doi.org/10.1044/1059-0889(1998/011).

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The standard method for calibrating a sound-level meter for use with the Brüel & Kjær Artificial Mastoid for bone vibrator tests entails the use of a signal generator, a precision voltmeter, and possibly a frequency counter. This equipment should be certified annually and traceable to the National Institute of Standards and Technology (NIST), and its use generally restricts calibration to a laboratory environment and requires a considerable amount of time. We have developed a simplified method for calibrating the sound-level meter by using a sound-level calibrator and microphone. Using the known sensitivities of the microphone and the artificial mastoid, the sound-level calibrator used for calibration of the microphone may also be used for calibration of the sound-level meter to measure force levels with the artificial mastoid.

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Peiman, Reihaneh, e Keith Clarke. "The Impact of Data Time Span on Forecast Accuracy through Calibrating the SLEUTH Urban Growth Model". International Journal of Applied Geospatial Research 5, n. 3 (luglio 2014): 21–35. http://dx.doi.org/10.4018/ijagr.2014070102.

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Does the spacing of time intervals used for model input data have an impact on the model's subsequent calibration and so projections of land use change and urban growth? This study evaluated the performance of the SLEUTH urban growth and land use change model through two independent model calibrations with different temporal extents (1972 to 2006 vs. 2000 to 2006) for the historical Italian cities of Pisa Province and their surroundings. The goal in performing two calibrations was to investigate the sensitivity of SLEUTH forecasts to longer or shorter calibration timelines, that is does calibrating the model over a longer time period produce better model fits and therefore forecasts? The best fit parameters from each calibration were then used in forecasting urban growth in the area up to the year 2027. The authors findings show that the spatial growth estimated by the model was strongly influenced by the physical landscape and road networks. The forecast outputs over 100 Monte Carlo trials reflect the start of newly formed detached settlements towards and along existing roads, i.e., classic urban sprawl. The authors conclude that the short term calibration was a better model fit compared to the long term calibration. Nevertheless, the absolute preference for the short-term calibration over long-term implies that time-sensitivity in calibration remains a challenge for SLEUTH applications.

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Zhang, Bao Long, Shao Jing Zhang, Wei Qi Ding e Hui Shuang Shi. "Fisheye Lens Distortion Calibration Based on the Lens Charactetic Curves". Applied Mechanics and Materials 519-520 (febbraio 2014): 636–39. http://dx.doi.org/10.4028/www.scientific.net/amm.519-520.636.

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The fisheye lens is a kind of ultra wide angle lens, which can produce a big super-wide-angle lens distortion. In order to cover a large scope of light, barrel distortion is artificially added to the optical system. However, in some cases this distortion is not allowed, then it requires calibrations of those distortions. Most of the traditional distortion calibration method uses target plane calibration to do it. This paper discusses the way of design fisheye lens, through which we can know the forming process of distortion clearly. Based on this paper, a simple and effective calibration method can be understood. Different from common camera calibration method, the proposed calibration method can avoid the error occurring in the process of calibrating test, that directly use the lens’ characteristic curve. Through multiple sets of experimental verifications, this method is effective and feasible.

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Senn, J. A., J. P. Mills, P. E. Miller, C. Walsh, S. Addy, E. Loerke e M. V. Peppa. "ON-SITE GEOMETRIC CALIBRATION OF THERMAL AND OPTICAL SENSORS FOR UAS PHOTOGRAMMETRY". ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B1-2020 (6 agosto 2020): 355–61. http://dx.doi.org/10.5194/isprs-archives-xliii-b1-2020-355-2020.

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Abstract. UAS imagery has become a widely used source of information in geomorphic research. When photogrammetric methods are applied to quantify geomorphic change, camera calibration is essential to ensure accuracy of the image measurements. Insufficient self-calibration based on survey data can induce systematic errors that can cause DEM deformations. The typically low geometric stability of consumer grade sensors necessitates in-situ calibration, as the reliability of a lab based calibration can be affected by transport. In this research a robust on-site workflow is proposed that allows the time-efficient and repeatable calibration of thermal and optical sensors at the same time. A stone building was utilised as calibration object with TLS scans for reference. The approach was applied to calculate eight separate camera calibrations using two sensors (DJI Phantom 4 Pro and Workswell WIRIS pro), two software solutions (Vision Measurement System (VMS) and Agisoft Metashape) and two different subsets of images per sensor. The presented results demonstrate that the approach is suitable to determine camera parameters for pre-calibrating photogrammetric surveys.

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Elmore, David F. "Polarization calibration techniques and scheduling for the Daniel K. Inouye Solar Telescope". Proceedings of the International Astronomical Union 10, S305 (dicembre 2014): 102–7. http://dx.doi.org/10.1017/s1743921315004603.

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AbstractThe Daniel K. Inouye Solar Telescope (DKIST), formerly Advanced Technology Solar Telescope when it begins operation in 2019 will be by a significant margin Earth's largest solar research telescope. Science priorities dictate an initial suite of instruments that includes four spectro-polarimeters. Accurate polarization calibration of the individual instruments and of the telescope optics shared by those instruments is of critical importance. The telescope and instruments have been examined end-to-end for sources of polarization calibration error, allowable contributions from each of the sources quantified, and techniques identified for calibrating each of the contributors. Efficient use of telescope observing time leads to a requirement of sharing polarization calibrations of common path telescope components among the spectro-polarimeters and for those calibrations to be repeated only as often as dictated by degradation of optical coatings and instrument reconfigurations. As a consequence the polarization calibration of the DKIST is a facility function that requires facility wide techniques.

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Mlcek, Jiri, Lukas Dvorak, Kvetoslava Sustova e Katarzyna Szwedziak. "Accuracy of the FT-NIR Method in Evaluating the Fat Content of Milk Using Calibration Models Developed for the Reference Methods According to Röse-Gottlieb and Gerber". Journal of AOAC INTERNATIONAL 99, n. 5 (1 settembre 2016): 1305–9. http://dx.doi.org/10.5740/jaoacint.16-0107.

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Abstract The study examined the effect of the choice of reference method on the functionality and reliability of calibrations in near-IR (NIR) spectroscopy intended for measuring the fat content in raw cow's milk. The fat content in the milk samples was evaluated using methods according to either Röse-Gottlieb or Gerber. The same samples were then subjected to analysis on an Antaris FT-NIR spectrometer. Using a partial least-squares algorithm, calibration models were created for both methods from the values measured. The calibration models show very good values of standard error of calibration: 0.133 for the Gerber method and 0.095 for the Röse-Gottlieb method. These calibrations were subsequently used to analyze 30 new samples of cow's milk of undefined fat content, and the differences in the values were evaluated using statistical paired t-test to a median value at a probability level of α = 0.05. No statistically significant differences were found. It was revealed that the reference method used for calibrating the device evaluating the fat content in raw cow's milk has no effect on the functionality and reliability of the calibration model.

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Tesi sul tema "Calibration"

Elkashef, Abdelaziz A. "Dry calibration milks for calibrating infrared milk analyzers". Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59816.

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Calibration powders were developed using combinations of milk ingredients for the purpose of calibration of infrared milk analyzers. They were shown to be capable of producing calibrations very similar to conventional calibration milks available commercially. A subsequent collaborative study was carried out involving nine laboratories to assess the performance of the preformulated powders in industrial quality control, payment and dairy herd analysis laboratories. The calibration powders were shown to produce consistent calibrations within laboratories and between laboratories and met AOAC specifications in terms of accuracy and repeatability. The reconstituted solutions were shown to be stable for up to 6 h at 40$ sp circ$C and could be stored under refrigerated conditions and used for repeated analyses for up to 21 days without apparent deterioration in calibration performance. It was concluded that the calibration powders perform as well as conventional calibrants, were more consistent overall and suitable for any calibration application. The calibration powders have the stability and performance characteristics to serve as reference standards for monitoring instrument performance and would be a useful tool for accrediting payment and dairy herd analysis laboratories.

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Williams, Braydon J. "Uncertainty of Stereo PIV Calibration and Self-Calibration". DigitalCommons@USU, 2017. https://digitalcommons.usu.edu/etd/5263.

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Particle image velocimetry (PIV) is a widely used fluid measurement technique. Three dimensional PIV data or stereo PIV is acquired using two cameras. Stereo cameras are calibrated from camera coordinates, pixels, to real world units such as millimeters using calibration models. Stereo calibration is fundamental to the accuracy of a PIV measurement. In this thesis, the accuracy of the stereo calibration is assessed. The mean error of stereo calibration was found to be 0.23%.

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Schopp, Patrick [Verfasser], e Yiannos [Akademischer Betreuer] Manoli. "State estimation, calibration, and self-calibration for accelerometer arrays". Freiburg : Universität, 2018. http://d-nb.info/1166053725/34.

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Esquivel, Sandro [Verfasser]. "Eye-to-Eye Calibration - Extrinsic Calibration of Multi-Camera Systems Using Hand-Eye Calibration Methods / Sandro Esquivel". Kiel : Universitätsbibliothek Kiel, 2015. http://d-nb.info/1073150615/34.

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Zhang, Guoqiang. "Camera network calibration". Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B37011844.

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Wan, Shuang. "Parametric array calibration". Thesis, University of Edinburgh, 2011. http://hdl.handle.net/1842/4902.

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The subject of this thesis is the development of parametric methods for the calibration of array shape errors. Two physical scenarios are considered, the online calibration (self-calibration) using far-field sources and the offline calibration using near-field sources. The maximum likelihood (ML) estimators are employed to estimate the errors. However, the well-known computational complexity in objective function optimization for the ML estimators demands effective and efficient optimization algorithms. A novel space-alternating generalized expectation-maximization (SAGE)-based algorithm is developed to optimize the objective function of the conditional maximum likelihood (CML) estimator for the far-field online calibration. Through data augmentation, joint direction of arrival (DOA) estimation and array calibration can be carried out by a computationally simple search procedure. Numerical experiments show that the proposed method outperforms the existing method for closely located signal sources and is robust to large shape errors. In addition, the accuracy of the proposed procedure attains the Cram´er-Rao bound (CRB). A global optimization algorithm, particle swarm optimization (PSO) is employed to optimize the objective function of the unconditional maximum likelihood (UML) estimator for the farfield online calibration and the near-field offline calibration. A new technique, decaying diagonal loading (DDL) is proposed to enhance the performance of PSO at high signal-to-noise ratio (SNR) by dynamically lowering it, based on the counter-intuitive observation that the global optimum of the UML objective function is more prominent at lower SNR. Numerical simulations demonstrate that the UML estimator optimized by PSO with DDL is optimally accurate, robust to large shape errors, and free of the initialization problem. In addition, the DDL technique is applicable to a wide range of array processing problems where the UML estimator is employed and can be coupled with different global optimization algorithms.

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Alsam, Ali. "Optimising spectral calibration". Thesis, University of East Anglia, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.405716.

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Spectral calibration is the problem of recovering colour device sensitivities (e. g. of a digital camera or scanner) given measured spectral data and the corresponding RGBs recorded by the device. Spectral calibration is useful because if we know how a color device responds to light then we can colourimetrically calibrate (map RGBs to perceptually relevant coordinates) using mathematical means. Unfortunately, spectral calibration is a hard problem. Device sensitivities are continuous functions of wavelength and so there are many degrees of freedom to be recover. This intrinsic high dimensional recovery problem is confounded by the fact that typical spectra colour signals are low dimensional. Specifically, though they are continuous functions of wavelength, the spectra can be parameterised by say 5 or 6 numbers. Spectral calibration then is an ill posed problem where we try to recover more parameters than we have degrees of freedom. One way to work with this ill posedness is to regularise the recovery (for example we might impose a constraint on the smoothness of the recovered sensor). This thesis makes 4 main contributions to spectral calibration. First, we undertake an in depth analysis of spectral calibration in general and regularisation techniques in particular. We show that existing approaches can be usefully combined to improve recovery performance. Second, we present a new and radically different approach to ill posedness. Rather than applying a constraint such as smoothness, we set forth methods to solve for all spectral sensitivities consistent with a given set of data (color signal spectra and corresponding RGBs). Given this feasible set, we show how we can calculate the most representative sensor and quantify its uncertainty. We can now evaluate the feasibility of regularised solutions and estimate their uncertainty. In the third part of this thesis we consider the practical hardness of spectral calibration. Measuring many colour signal spectra is a time consuming task and so we wondered how many colour signal spectra we had to measure to arrive at a good solution. Mathematical and experimental results show that spectral calibration, which previously involved 100s of measurements, can be replicated with just 6 or 7 spectra. Finally, we present a new method for estimating the support of a sensor (the part of the visible spectrum over which a sensor is sensitive) and incorporate this into our spectral calibration methods. This is shown to be a surprisingly powerful constrain for spectral calibration.

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Zhang, Guoqiang, e 張國強. "Camera network calibration". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B37011844.

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O'Kennedy, Brian James. "Stereo camera calibration". Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/53063.

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Thesis (MScEng)--Stellenbosch University, 2002.
ENGLISH ABSTRACT: We present all the components needed for a fully-fledged stereo vision system, ranging from object detection through camera calibration to depth perception. We propose an efficient, automatic and practical method to calibrate cameras for use in 3D machine vision metrology. We develop an automated stereo calibration system that only requires a series of views of a manufactured calibration object in unknown positions. The system is tested against real and synthetic data, and we investigate the robustness of the proposed method compared to standard calibration practice. All the aspects of 3D stereo reconstruction is dealt with and we present the necessary algorithms to perform epipolar rectification on images as well as solving the correspondence and triangulation problems. It was found that the system performs well even in the presence of noise, and calibration is easy and requires no specialist knowledge.
AFRIKAANSE OPSOMMING: Ons beskryf al die komponente van 'n omvattende stereo visie sisteem. Die kern van die sisteem is 'n effektiewe, ge-outomatiseerde en praktiese metode om kameras te kalibreer vir gebruik in 3D rekenaarvisie. Ons ontwikkel 'n outomatiese, stereo kamerakalibrasie sisteem wat slegs 'n reeks beelde van 'n kalibrasie voorwerp in onbekende posisies vereis. Die sisteem word getoets met reële en sintetiese data, en ons vergelyk die robuustheid van die metode met die standaard algoritmes. Al die aspekte van die 3D stereo rekonstruksie word behandel en ons beskryf die nodige algoritmes om epipolêre rektifikasie op beelde te doen sowel as metodes om die korrespondensie- en diepte probleme op te los. Ons wys dat die sisteem goeie resultate lewer in die aanwesigheid van ruis en dat kamerakalibrasie outomaties kan geskied sonder dat enige spesialis kennis benodig word.

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Willerton, Marc. "Array auto-calibration". Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/11684.

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In this thesis, efficient methods are presented to calibrate large or small aperture array systems containing different types of uncertainties. specifically the challenge of reducing the number of external sources required to calibrate an array is addressed and array calibration methods suitable for use when sources may be operating in the "near-far" field of the array are developed. Together, this can ease the overheads involved in calibrating and recalibrating an array system. In addition to presenting novel array calibration algorithms, this thesis also presents a novel transformation allowing a planar array to be expressed as a virtual uniform linear array of a much larger number of elements. This allows the array manifold of a planar array, which in general consists of non-hyperhelical curves, to be expressed using a number of hyperhelices which each correspond to the array manifold of a linear array. This hyperhelical structure has the potential to ease calibration overheads as well as having many other potential applications in array processing. This thesis presents novel pilot and auto array calibration schemes for estimating different types of array uncertainties. A novel pilot calibration algorithm is proposed whereby a single source transmitting from a known location (i.e. a pilot) at two carrier frequencies is used to estimate geometrical uncertainties in a planar array. This is achieved by exploiting the frequency dependence on the boundary between the "near-far" and "far" field of the array. In addition, an auto-calibration method is presented which doesn't require any external sources to estimate array uncertainties. Here, geometrical, complex gain and local oscillator (i.e. frequency and phase) uncertainties associated with the array elements are considered. In this approach, array elements transmit in turn to the others which operate as an array receiver. Large and small array apertures are investigated. Throughout the thesis, extensive computer simulations are presented to analyse the performance of the algorithms developed.

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Libri sul tema "Calibration"

Tormod, Naes, a cura di. Multivariate calibration. Chichester: Wiley, 1991.

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1934-, Bernhardt Rolf, e Albright S. L, a cura di. Robot calibration. London: Chapman & Hall, 1993.

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Center, Lewis Research, a cura di. Calibration Laboratory. [Cleveland, Ohio]: Lewis Research Center, 1992.

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Tormod, Næs, a cura di. Multivariate calibration. Chichester [England]: Wiley, 1989.

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Wise, Jacquelyn A. Thermometer calibration: A model for state calibration laboratories. Gaithersburg, MD: U.S. Dept. of Commerce, National Bureau of Standards, 1986.

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Wise, Jacquelyn A. Thermometer calibration: A model for state calibration laboratories. Washington: U.S. Dept. of Commerce, National Bureau of Standards, 1986.

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Gregory, Allan W. Calibration in macroeconomics. Kingston, Ont: Institute for Economic Research, Queen's University, 1991.

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M, Hall J., e Chemical Science and Technology Laboratory (U.S.). Fluid Metrology Group, a cura di. Airspeed calibration service. Gaithersburg, MD: Fluid Metrology Group, Process Measurements Division, Chemical Science and Technology Laboratory, National Institute of Standards and Technology, 2007.

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Kroon, Cornelius W. Liquid calibration handbook. 2^a ed. Fresno, Calif: Thomson Publications, 1987.

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Organisation Internationale de Métrologie Légale. Guide to calibration. Paris: OIML, 1989.

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Capitoli di libri sul tema "Calibration"

Franceschini, Fiorenzo, Maurizio Galetto, Domenico Maisano, Luca Mastrogiacomo e Barbara Pralio. "System Calibration calibration". In Distributed Large-Scale Dimensional Metrology, 117–39. London: Springer London, 2011. http://dx.doi.org/10.1007/978-0-85729-543-9_5.

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Chevez, Agustin. "Let’s Go!" In The Pilgrim’s Guide to the Workplace, 113–14. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-4759-9_31.

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Duffy, Frank H., Vasudeva G. Iyer e Walter W. Surwillo. "Calibration and Calibration Methods". In Clinical Electroencephalography and Topographic Brain Mapping, 42–45. New York, NY: Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4613-8826-5_6.

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Kunze, Hans-Joachim. "Calibration". In Introduction to Plasma Spectroscopy, 75–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02233-3_5.

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Li, Weitao, Fule Li e Zhihua Wang. "Calibration". In Analog Circuits and Signal Processing, 109–50. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-62012-1_6.

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Weirich, Paul. "Calibration". In EPSA Philosophy of Science: Amsterdam 2009, 415–25. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-2404-4_34.

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Bulska, Ewa. "Calibration". In Lecture Notes in Chemistry, 53–64. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99206-8_5.

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Beyna, Ingo. "Calibration". In Lecture Notes in Economics and Mathematical Systems, 27–46. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-34925-6_4.

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Carmignato, Simone. "Calibration". In CIRP Encyclopedia of Production Engineering, 1–5. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-35950-7_16754-1.

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Sandau, Rainer. "Calibration". In Digital Airborne Camera, 261–72. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-8878-0_5.

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Atti di convegni sul tema "Calibration"

Kliment, P., M. Šmíd e G. Porrovecchio. "UNFILTERED TRAP-BASED PHOTOMETER CALIBRATION". In CIE 2021 Conference. International Commission on Illumination, CIE, 2021. http://dx.doi.org/10.25039/x48.2021.po19.

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LED-based light sources have replaced massively traditional sources. The metrology traceability chains realised in leading European NMIs utilise the absolutely calibrated broadband radiometers (three-element silicon trap detectors) for calibrating primary photometers. Specific spectral properties of white LED allow to apply the trap detectors directly as new primary photometers. The unfiltered technique (Dӧnsberg at al., 2014) is used and the calibration of spectral irradiance responsivity is needed. We have a long experience in detector-based spectral irradiance responsivity calibrations declared by particular CMC’s published in BIPM KCDB. The aim of this work was to revise the uncertainty budget in order to reduce the measurement uncertainties for specific application of calibration of the trap-based unfiltered primary photometers UPP. The two calibration methods were used to analyse the occasional back-reflection effect of the UPP front aperture. The measurement was performed using our reference spectral responsivity facility in spectral range 350 nm – 900 nm.

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Gust, Jeff, Steven Haynes, Bill Britz, Randy Lemon, Neil Faulkner e Greg Tarolli. "Updated Evaluation of Calibration Test Point Selection for Fluke 57XX products". In NCSL International Workshop & Symposium. NCSL International, 2013. http://dx.doi.org/10.51843/wsproceedings.2013.30.

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The first Fluke 5700 series calibrator was manufactured in the late 1980’s. The metrology and associated test point selection for calibrating the product was rigorous by any standards, then or now. However, the calibration procedure that has been in place essentially since its initial release pre-dates significant advances in hardware, such as the Fluke Calibration 792A and 5790A, as well as ISO 17025, and the popularization of voluntary calibration laboratory accreditation. Fluke Calibration has re-visited the selection of test points in the calibration procedure to ensure that the result of any 5700 series calibrator would clearly demonstrate that all specifications have been verified, and that traceability for all functions is ensured. This was accomplished by an event that brought together representatives from Design Engineering, Test Engineering, Service Engineering, Service Metrology and Corporate Metrology. The group evaluated each specification, considered the internal architecture of the product, and reviewed and improved upon the test points. This paper presents the test points for the 5700 series calibrators and the technical information as to why they were chosen.

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Gamatham, Romeo, Johan Burger, Renier Siebrits e Geomarr Van Tonder. "GNSS Traveling Calibrator Calibration Verification using a Dual Calibration Method". In 4th URSI Atlantic RadioScience Conference. Gent, Belgium: URSI – International Union of Radio Science, 2024. http://dx.doi.org/10.46620/ursiatrasc24/cgju1435.

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Guangwei, Daniel Teo, Boxin Shi, Yinqiang Zheng e Sai-Kit Yeung. "Self-Calibrating Polarising Radiometric Calibration". In 2018 IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR). IEEE, 2018. http://dx.doi.org/10.1109/cvpr.2018.00299.

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Barden, William, Gabriel Soto, Yongsheng Gao e Minerba Betancourt. "Calibration of ICARUS Detector Walls". In Calibration of ICARUS Detector Walls. US DOE, 2021. http://dx.doi.org/10.2172/1825326.

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Abdelhamid, Maan. "NuMI Hadron Monitor – Calibration Stand". In NuMI Hadron Monitor – Calibration Stand. US DOE, 2023. http://dx.doi.org/10.2172/1998902.

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Yang, Joshua. "Promote our Quality of Life By Accurate Measurment through Traceable Calibration". In NCSL International Workshop & Symposium. NCSL International, 2015. http://dx.doi.org/10.51843/wsproceedings.2015.51.

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Good quality of product increases quality of life. Accurate measurement data increases good quality of products, such as foods, electrical devices, construction materials, etc. Many factors determine the correctness and reliability of the measurement. Measurement traceability is one of great significance. In order to make sure the competence of testing and calibration laboratories, ILAC implements its policy on the traceability of measurement results (ILAC P10:01/2013) [1]. TAF (Taiwan Accreditation Foundation) adopts ILAC P10 to construct its own policy on the traceability of measurement results (TAF-CNLA-R04) [4]. In order to establish metrological traceability for their own activities, some of the accredited laboratories perform internal calibrations or "In-house" calibrations. How to make sure the correctness and reliability of the internal calibration? TAF has a requirement for internal calibrations, that is, "Technical Criteria for internal Calibrations" (TAF-CNLA-T18) [5]. The laboratories performing internal calibration shall establish calibration procedures for the calibration operation performed and shall meet the same technical criteria for accredited calibration laboratories. The estimation and expression of measurement uncertainty of these laboratories shall follow "ISO/IEC 98-3:2008 Uncertainty of measurement - Part 3: Guide to the expression of uncertainty in measurement (GUM: 1995))[2]". The results of uncertainty shall be provided to TAF for assessment. The internal calibration laboratories must have records of proficiency testing, at least one record every three years, for monitoring the validity of internal calibrations undertaken.

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Legrand, B., e R. Labayrade. "COLORIMETRIC CALIBRATION BETWEEN RGB AND LMSR SPACES". In CIE 2023 Conference. International Commission on Illumination, CIE, 2023. http://dx.doi.org/10.25039/x50.2023.po060.

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In this paper colorimetric calibrations between RGB (camera or screen space) and LMSR (biological eye color-space with cones ‘LMS’ and rods ‘R’) spaces are purposed. Both acquisition (RGB → LMSR) and restitution (LMSR → RGB) are investigated. The method described in this paper is based on four colorimetric calibrations RGB → LMS, RGB → LMR, RGB → LSR and → MSR. First, a new way to ensure colorimetric calibration is described. This new colorimetric calibration is named tetraedric-based calibration and consist to a trilinear interpolation. Secondly, an SVD-based and a tetraedric-based colorimetric calibration between RGB and LMSR spaces are performed for 8 different light sources (acquisition) and for one screen (restitution). For both acquisition and restitution, the tetraedric-based method provides better relative errors per channel than the SVD one, acquisition: 5.5% (SVD) against 2.3% (tetraedric) and restitution: 4.8% (SVD) against 1.44% (tetraedric).

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Kunitz, Logan. "Is Instrument Interchangeability in Calibration Just A Dream?" In NCSL International Workshop & Symposium. NCSL International, 2015. http://dx.doi.org/10.51843/wsproceedings.2015.40.

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As instruments steadily get more complicated, manual calibrations become less feasible. Many laboratories are too small to write full, automated solutions for calibration, so it is common for solutions for automated calibration to be used by many laboratories. However, each laboratory has a different set of standards that they can use for calibrations, so these automated solutions should be able to handle different instruments that can be used interchangeably. In other words, they should support ´instrument interchangeability’. This paper will examine some of the use cases that should be handled by these calibration solutions along with the difficulties that arise in attempts to solve them.

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Krouse, Charles R., Grant O. Musgrove, Taewoan Kim, Seungmin Lee, Muhyoung Lee e Seongyong Jeong. "Method and Verification for Material Calibration of the Chaboche Plasticity Model for Multiple Material Directions". In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-04132.

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Abstract The Chaboche model is a well-validated non-linear kinematic hardening material model. This material model, like many models, depends on a set of material constants that must be calibrated for it to match the experimental data. Due to the challenge of calibrating these constants, the Chaboche model is often disregarded. The challenge with calibrating the Chaboche constants is that the most reliable method for doing the calibration is a brute force approach, which tests thousands of combinations of constants. Different sampling techniques and optimization schemes can be used to select different combinations of these constants, but ultimately, they all rely on iteratively selecting values and running simulations for each selected set. In the experience of the authors, such brute force methods require roughly 2,500 combinations to be evaluated in order to have confidence that a reasonable solution is found. This process is not efficient. It is time-intensive and labor-intensive. It requires long simulation times, and it requires significant effort to develop the accompanying scripts and algorithms that are used to iterate through combinations of constants and to calculate agreement. A better, more automated method exists for calibrating the Chaboche material constants. In this paper, the authors describe a more efficient, automated method for calibrating Chaboche constants. The method is validated by using it to calibrate Chaboche constants for an IN792 single-crystal material and a CM247 directionally-solidified material. The calibration results using the automated approach were compared to calibration results obtained using a brute force approach. It was determined that the automated method achieves agreeable results that are equivalent to, or supersede, results obtained using the conventional brute force method. After validating the method for cases that only consider a single material orientation, the automated method was extended to multiple off-axis calibrations. The Chaboche model that is available in commercial software, such as ANSYS, will only accept a single set of Chaboche constants for a given temperature. There is no published method for calibrating Chaboche constants that considers multiple material orientations. Therefore, the approach outlined in this paper was extended to include multiple material orientations in a single calibration scheme. The authors concluded that the automated approach can be used to successfully, accurately, and efficiently calibrate multiple material directions. The approach is especially well-suited when off-axis calibration must be considered concomitantly with longitudinal calibration. Overall, the automated Chaboche calibration method yielded results that agreed well with experimental data. Thus, the method can be used with confidence to efficiently and accurately calibrate the Chaboche non-linear kinematic hardening material model.

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Rapporti di organizzazioni sul tema "Calibration"

Berg, Robert F., e James A. Fedchak. NIST Calibration Services for Spinning Rotor Gauge Calibrations. National Institute of Standards and Technology, maggio 2015. http://dx.doi.org/10.6028/nist.sp.250-93.

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Wise, Jacquelyn A., e Robert J, Jr Soulen. Thermometer calibration :. Gaithersburg, MD: National Bureau of Standards, 1986. http://dx.doi.org/10.6028/nbs.mono.174.

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Graham, Emmelyn. PR-363-18605-R01 High Pressure Calibration of Turbines with an Inert Gas. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), giugno 2020. http://dx.doi.org/10.55274/r0011683.

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More cost-effective high-pressure calibrations could be provided by using inert gas instead of natural gas. However, the impact of the different gas properties must be investigated to reduce any bias that could result in substantial financial risks for trading large volumes of gases. The research objective was to develop and test a transfer model for turbine flowmeters that could be used to translate a calibration in an inert gas to be suitable for use in natural gas applications. This report covers the turbine flow meter modelling and verification data for the transfer of turbine flow meter calibrations between natural gas and an inert gas.

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John F. Schabron, Joseph F. Rovani e Susan S. Sorini. Mercury CEM Calibration. Office of Scientific and Technical Information (OSTI), marzo 2007. http://dx.doi.org/10.2172/910141.

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Gardner C., L. Ratner e T. Roser. Foil Position Calibration. Office of Scientific and Technical Information (OSTI), marzo 1993. http://dx.doi.org/10.2172/1131609.

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Swiler, Laura, e Timothy Trucano. Calibration Under Uncertainty. Office of Scientific and Technical Information (OSTI), marzo 2005. http://dx.doi.org/10.2172/1143309.

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Welch, J. BXS Re-calibration. Office of Scientific and Technical Information (OSTI), novembre 2010. http://dx.doi.org/10.2172/993414.

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John Schabron, Eric Kalberer, Joseph Rovani, Mark Sanderson, Ryan Boysen e William Schuster. Mercury Calibration System. Office of Scientific and Technical Information (OSTI), marzo 2009. http://dx.doi.org/10.2172/993816.

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John Schabron, Joseph Rovani e Mark Sanderson. Mercury CEM Calibration. Office of Scientific and Technical Information (OSTI), febbraio 2008. http://dx.doi.org/10.2172/993831.

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