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Articoli di riviste sul tema "Measurement"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 5 novembre 2024

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1

Oleniacz, Grzegorz, Izabela Skrzypczak e Tomasz Świętoń. "ACCURACY OF RTN MEASUREMENT IN VARIOUS MEASUREMENT CONDITIONS". Zeszyty Naukowe Uniwersytetu Zielonogórskiego / Inżynieria Środowiska 166, n. 46 (3 luglio 2017): 16–24. http://dx.doi.org/10.5604/01.3001.0010.6029.

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Series of GNSS receiver tests allowed to determine real accuracy of RTN measurements. Repeated measurements allowed to estimate accuracy in function of used navigation satellite system, duration of measurements and field conditions on measurement site which are related to horizon visibility by obstacles (bushes). Research results indicate no dependency between the technology used and the measurement accuracies obtained and significant impact of the conditions on set-up on the measurement's results.

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Łętocha, Aneta, Tatiana Miller e Janusz Kalisz. "Influence of measurement areas selection on roughness parameters in burnished surfaces measurements". Mechanik, n. 5-6 (maggio 2016): 552–53. http://dx.doi.org/10.17814/mechanik.2016.5-6.82.

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3

Oberrecht, Stephen P., James G. Kohl e Duane L. Simonson. "OS7-14 Dynamic Complex Shear Modulus Measurements of Silicone Elastomers Containing Coated Clay Particles Using an Experimental Linear Rheometer(Stress and strain measurement IV,OS7 Stress and strain measurement,MEASUREMENT METHODS)". Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2015.14 (2015): 105. http://dx.doi.org/10.1299/jsmeatem.2015.14.105.

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4

Buchholz, F. I., W. Kessel e F. Melchert. "Noise power measurements and measurement uncertainties". IEEE Transactions on Instrumentation and Measurement 41, n. 4 (1992): 476–81. http://dx.doi.org/10.1109/19.155910.

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5

Judish, R. M. "Quality control of measurements—Measurement assurance". Proceedings of the IEEE 74, n. 1 (1986): 23–25. http://dx.doi.org/10.1109/proc.1986.13394.

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6

Parekh, S. V. "The measurements column (antenna gain measurement)". IEEE Antennas and Propagation Magazine 32, n. 2 (aprile 1990): 41–44. http://dx.doi.org/10.1109/74.80503.

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KIDO, Ryo, e Kozo TAGUCHI. "Cellular Temperature Measurement by Dielectrophoretic Impedance Measurement Method". Journal of the Japan Society of Applied Electromagnetics and Mechanics 23, n. 3 (2015): 601–5. http://dx.doi.org/10.14243/jsaem.23.601.

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8

Kroc, Edward. "Generalized measurement error: Intrinsic and incidental measurement error". PLOS ONE 18, n. 6 (29 giugno 2023): e0286680. http://dx.doi.org/10.1371/journal.pone.0286680.

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In this paper, we generalize the notion of measurement error on deterministic sample datasets to accommodate sample data that are random-variable-valued. This leads to the formulation of two distinct kinds of measurement error: intrinsic measurement error, and incidental measurement error. Incidental measurement error will be recognized as the traditional kind that arises from a set of deterministic sample measurements, and upon which the traditional measurement error modelling literature is based, while intrinsic measurement error reflects some subjective quality of either the measurement tool or the measurand itself. We define calibrating conditions that generalize common and classical types of measurement error models to this broader measurement domain, and explain how the notion of generalized Berkson error in particular mathematicizes what it means to be an expert assessor or rater for a measurement process. We then explore how classical point estimation, inference, and likelihood theory can be generalized to accommodate sample data composed of generic random-variable-valued measurements.

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9

Gowda S.L., Girish, Jayanth Kumar H.V., Anand Kuriyan Mathew, Veeresh G.S. e Cholenahally Nanjappa Manjunath. "Intraoperative Flow Measurement of Saphenous Vein Graft: Transit Time Flowmetry Measurement Versus Free Flow Measurement". Journal of Cardiovascular Medicine and Surgery 5, n. 1 (2019): 11–14. http://dx.doi.org/10.21088/jcms.2454.7123.5119.2.

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10

Su, Fei, e Xiaoxu Pan. "OS7-2 Stress measurement for ferromagnetic specimen using magnetoacoustic emission(Stress and strain measurement I,OS7 Stress and strain measurement,MEASUREMENT METHODS)". Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2015.14 (2015): 93. http://dx.doi.org/10.1299/jsmeatem.2015.14.93.

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11

Ishikawa, Shigemi, Kazutoshi Furukawa, Sozo Itoh, Tokiko Nakasato, Fumiko Nemoto, Riichiro Sato, Atsushi Yamagishi et al. "Fundamental study in measurement of gingival color. Measurement apparatus and conditions of measurements." Nihon Hotetsu Shika Gakkai Zasshi 32, n. 2 (1988): 462–70. http://dx.doi.org/10.2186/jjps.32.462.

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Lingamdenne, Peter Ericson, e Pavani Marapaka. "MEASUREMENT AND ANALYSIS OF ANTHROPOMETRIC MEASUREMENTS OF THE HUMAN SCAPULA IN TELANGANA REGION, INDIA". International Journal of Anatomy and Research 4, n. 3.2 (31 agosto 2016): 2677–83. http://dx.doi.org/10.16965/ijar.2016.302.

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13

Fuzak, Corey. "Sound level measurement accessories". INTER-NOISE and NOISE-CON Congress and Conference Proceedings 264, n. 1 (24 giugno 2022): 552–59. http://dx.doi.org/10.3397/nc-2022-772.

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Measurement standards provide sound level measurement methods and the information to be recorded. There are also many documents about the best practices utilized for completing the measurements. The current paper provides examples of some useful sound level measurement accessories. Luggage, safety equipment, hand tools, and tripods are some of the accessories covered. The accessories help accomplish the measurements.

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14

Johannsen, K. G. "Measurement of satellite communication parameters-transponder measurements". IEEE Transactions on Instrumentation and Measurement 37, n. 1 (marzo 1988): 121–26. http://dx.doi.org/10.1109/19.2679.

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15

Lopez-Sanchez, Ana, e Lester W. Schmerr. "Ultrasonic Nondestructive Measurement Systems – Models and Measurements". Key Engineering Materials 321-323 (ottobre 2006): 1–5. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.1.

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The electroacoustic measurement model is an explicit model of an entire ultrasonic measurement system, including the pulser/receiver, cabling, and transducers. A summary is given of the measurement procedures needed for characterizing all the system elements contained in this measurement model, including a description of a new pulse-echo method for obtaining the sensitivity and impedance of an ultrasonic transducer. It is demonstrated that these models and measurement procedures can be combined to accurately simulate the measured voltage of a pulseecho immersion system.

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16

Gerhardt, J., e H. J. Schlaak. "Sinusoidal vibration measurements using optimal measurement intervals". Measurement 34, n. 2 (settembre 2003): 133–41. http://dx.doi.org/10.1016/s0263-2241(03)00030-7.

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17

Levin, S. F. "Providing unified measurements in calibrating measurement sensors". Measurement Techniques 49, n. 7 (luglio 2006): 639–47. http://dx.doi.org/10.1007/s11018-006-0162-0.

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18

Emms, Grant, e Tony Walther. "Flanking Transmission Measurements: Part 1- Measurement Techniques". Building Acoustics 17, n. 1 (gennaio 2010): 15–33. http://dx.doi.org/10.1260/1351-010x.17.1.15.

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19

Pohovski, Toni, Vjenceslav Kuprešanin, Filip Razum, Davor Švarc e Matej Dorešić. "Automated Measurement System of High Accuracy for Shunt Reactors". Journal of Energy - Energija 73, n. 2 (4 giugno 2024): 3–7. http://dx.doi.org/10.37798/2024732515.

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System for automated transformer tests (ATT) enables different measurements on power transformers, from simple to the most complex, with a high degree of automation. ATT system is now expanded with modules for measurements on shunt reactors. The measurements related to shunt reactors that are covered with the system are: measurement of losses, impedance measurement, linearity test, zero impedance measurement, winding resistance measurement, temperature rise test and measurement of mutual reactance. Besides the measurement, ATT enables data analysis and report generation, all in accordance with [1,2]. Measurement of shunt reactor losses with satisfactory accuracy is a big challenge due to power factors of the reactors as low as 0,001. A system for loss measurements with high accuracy, consisting of measuring bridge, current comparator and standard capacitor is integrated into ATT. In the paper, a comparison in terms of loss measurement accuracy on shunt reactor is given for two measurement systems – a newly integrated system for shunt reactors and standard system used for transformer measurements.

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Morrison, Malcolm. "Measurement - Which Measurement?" Journal of Orthopaedic Medicine 29, n. 1 (gennaio 2007): 9. http://dx.doi.org/10.1080/1355297x.2007.11736310.

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21

Angevine, Peter D., e Michael G. Kaiser. "RADIOGRAPHIC MEASUREMENT TECHNIQUES". Neurosurgery 63, suppl_3 (1 settembre 2008): A40—A45. http://dx.doi.org/10.1227/01.neu.0000320425.55569.21.

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ABSTRACT THE EVALUATION AND treatment of spinal deformities begins with the accurate measurement of appropriate spinal parameters. The surgeon must ensure that the patient is positioned properly for all necessary x-ray scans and that the proper studies are completed. The relevant measurements must be identified and recorded for each study. Understanding the proper measurement techniques will increase the accuracy and reliability of the measurements. From these precise measurements the surgeon can begin to determine key characteristics of the deformity and develop an appropriate treatment plan.

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22

Matsuo, Noboru, e Peter Maimon Ross. "Accurate measurement of psoralen-crosslinked DNA: Direct biochemical measurements and indirect measurement by hybridization". Archives of Biochemistry and Biophysics 266, n. 2 (novembre 1988): 351–68. http://dx.doi.org/10.1016/0003-9861(88)90267-6.

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23

Varney, Esther J., Ashley M. Van Drunen, Emily F. Moore, Kristen Carlin e Karen Thomas. "Blood Pressure Measurement Error in Children: Lessons in Measurement Reliability". Journal of Nursing Measurement 27, n. 1 (1 aprile 2019): 114–25. http://dx.doi.org/10.1891/1061-3749.27.1.114.

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Background and PurposeBlood pressure measurement represents the pressure exerted during heart ejection and filling. There are several ways to measure blood pressure and a valid measure is essential. The purpose of this study was to evaluate the approach to noninvasive blood pressure measurement in children.MethodsBlood pressure measurements were taken using the automatic Phillips MP30 monitor and compared against Welch Allyn blood pressure cuffs with Medline manual sphygmomanometers.ResultsA total of 492 measurements were taken on 82 subjects, and they demonstrated comparability between automatic and manual devices.ConclusionsAlthough our study indicated acceptable agreement between automatic and manual blood pressure measurement, it also revealed measurement error remains a concern, with sample size, study protocol, training, and environment all playing a role.

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Unsal, Bulent, Dimosthenis Trimis e Franz Durst. "On-line Instantaneous Mass Flow Rate Measurements Through Injection Nozzles of Internal Combustion Engines(Measurement)". Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2005 (2005): 653–58. http://dx.doi.org/10.1299/jsmeicjwsf.2005.653.

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25

Fischer, Andreas. "Limiting Uncertainty Relations in Laser-Based Measurements of Position and Velocity Due to Quantum Shot Noise". Entropy 21, n. 3 (8 marzo 2019): 264. http://dx.doi.org/10.3390/e21030264.

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With the ongoing progress of optoelectronic components, laser-based measurement systems allow measurements of position as well as displacement, strain and velocity with unbeatable speed and low measurement uncertainty. The performance limit is often studied for a single measurement setup, but a fundamental comparison of different measurement principles with respect to the ultimate limit due to quantum shot noise is rare. For this purpose, the Cramér-Rao bound is described as a universal information theoretic tool to calculate the minimal achievable measurement uncertainty for different measurement techniques, and a review of the respective lower bounds for laser-based measurements of position, displacement, strain and velocity at particles and surfaces is presented. As a result, the calculated Cramér-Rao bounds of different measurement principles have similar forms for each measurand including an indirect proportionality with respect to the number of photons and, in case of the position measurement for instance, the wave number squared. Furthermore, an uncertainty principle between the position uncertainty and the wave vector uncertainty was identified, i.e., the measurement uncertainty is minimized by maximizing the wave vector uncertainty. Additionally, physically complementary measurement approaches such as interferometry and time-of-flight positions measurements as well as time-of-flight and Doppler particle velocity measurements are shown to attain the same fundamental limit. Since most of the laser-based measurements perform similar with respect to the quantum shot noise, the realized measurement systems behave differently only due to the available optoelectronic components for the concrete measurement task.

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26

Li, Guoli, Jinsong Shen, Edward Smith e Chetna Patel. "Development of a Manual Measurement Device for Measuring Hallux Valgus Angle in Patients with Hallux Valgus". International Journal of Environmental Research and Public Health 19, n. 15 (26 luglio 2022): 9108. http://dx.doi.org/10.3390/ijerph19159108.

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Background: Hallux valgus (HV) is one of the most common forefoot deformities, and its prevalence increases with age. HV has been associated with poor foot function, difficulty in fitting footwear and poor health-related quality of life. The aims of this study were to design and develop an easy-to-use measurement device for measuring hallux valgus angle (HVA) in patients with HV and to assess the measurement reliability of the newly designed measurement device. Methods: A manual measurement device for measuring HVA was designed and developed to test on patients with HV. Two measuring methods, i.e., test–retest and intra-observer measurements, were used to evaluate the repeatability and reliability of the newly designed measurement device. In the test–retest measurements, a total of 42 feet from 26 patients with HV were repeatedly measured by the same researcher using the manual measurement device every 3 weeks over a period of 12 months. The measurement reliability of the newly designed measurement device was analysed based on the collected HVA data. In the intra-observer measurements, a total of 22 feet from the same group of HV patients were measured by the same researcher using the manual measurement device and by a consultant using X-ray measurement for comparison. The intraclass correlation coefficient (ICC) was used to determine the correlation of measurements between the manual measurement device and X-ray measurement. Results: The mean of the difference between the two repeat measurements of HVA using the newly designed manual device was 0.62°, and the average of ICC was 0.995, which indicates excellent reliability. The ICC between X-ray and the average of twice-repeated manual measurements was 0.868, with 95% CI (0.649, 0.947) (p = 0.000). When the relationship in HVA between X-ray measurement and manual measurement using the new device was regressed as a linear relationship, the regression equation was y = 1.13x − 4.76 (R2 = 0.70). Conclusions: The newly designed measurement device is easy to use, with low-cost and excellent reliability for HVA measurement, with the potential for use in clinical practice.

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Michalkova, Lucia, e Katarina Frajtova Michalikova. "Credit risk measurement". New Trends and Issues Proceedings on Humanities and Social Sciences 3, n. 4 (22 marzo 2017): 168–74. http://dx.doi.org/10.18844/gjhss.v3i4.1562.

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28

Hoogerheide, David P., e Frank Heinrich. "AutoRefl: active learning in neutron reflectometry for fast data acquisition". Journal of Applied Crystallography 57, n. 4 (31 luglio 2024): 1192–204. http://dx.doi.org/10.1107/s1600576724006447.

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Neutron reflectometry (NR) is a powerful technique for interrogating the structure of thin films at interfaces. Because NR measurements are slow and instrument availability is limited, measurement efficiency is paramount. One approach to improving measurement efficiency is active learning (AL), in which the next measurement configurations are selected on the basis of information gained from the partial data collected so far. AutoRefl, a model-based AL algorithm for neutron reflectometry measurements, is presented in this manuscript. AutoRefl uses the existing measurements of a function to choose both the position and the duration of the next measurement. AutoRefl maximizes the information acquisition rate in specific model parameters of interest and uses the well defined signal-to-noise ratio in counting measurements to choose appropriate measurement times. Since continuous measurement is desirable for practical implementation, AutoRefl features forecasting, in which the optimal positions of multiple future measurements are predicted from existing measurements. The performance of AutoRefl is compared with that of well established best practice measurements for supported lipid bilayer samples using realistic digital twins of monochromatic and polychromatic reflectometers. AutoRefl is shown to improve NR measurement speeds in all cases significantly.

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Otrusinová, Lenka, L. Čepová e Lenka Petřkovská. "Measurement of Deviation of Roundnes". Technological Engineering 10, n. 1 (1 dicembre 2013): 21–24. http://dx.doi.org/10.2478/teen-2013-0006.

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Abstract For the measurement of roundness deviations are used different measuring methods and measuring Instruments from universal to high-precision measuring Instruments. Recently, optical measurement Instruments have irreplaceable role and get to the forefront due simpler process of measurement, accelerate measuring and large possibility to storage obtained data. Nowadays more and more successful optical measurements above touch measurement, but touch measurement still has an important role in companies. Therefore, in the experiment were measured the deviations of the roundness on devices measuring by touch method, and by the optical devices. The values of these measurements allowed their comparison and stastical evaluation.

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Norin, Veniamin. "Statistical processing of multiple measurements results". E3S Web of Conferences 389 (2023): 07004. http://dx.doi.org/10.1051/e3sconf/202338907004.

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The product quality is determined by improvements of equipment, technologies, and production arrangement, which directly depends on the accuracy of measurement information. To achieve high measurement accuracy, it is reasonable to automate measurement processes. In case of automation, some functions are performed by equipment computer programs. The processing of direct comprehensive measurements is a complicated process including multiple algorithms of computation and various hypothesis tests. Taking into account the complexity and duration of statistical processing of results of multiple measurements, this paper is intended to develop a software measurement suite to process direct multiple measurements. The software measurement suite is a number of tools and software programs operating together to accomplish the tasks related with acquisition of required parameters and measurement results. To achieve this goal, it was required to address the following issues: implementation of the advanced measurement technologies into the developed software measurement suite; using wireless transmission of observation findings; ensuring compatibility of the developed software with the proprietary software of the used measurement instruments; improving the quality of measurements; improving the quality of processing measurement results by minimising the human factor effects on the processing quality; minimising the time spend for processing of the obtained measurement results.

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Senanayake, Muditha, Amar Raheja e Yuhan Zhang. "Automated human body measurement extraction". International Journal of Clothing Science and Technology 30, n. 2 (16 aprile 2018): 175–94. http://dx.doi.org/10.1108/ijcst-01-2017-0002.

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PurposeThe purpose of this paper is to develop an automated human body measurement extraction system using simple inexpensive equipment with minimum requirement of human assistance. This research further leads to the comparison of extracted measurements to established methods to analyze the error. The extracted measurements can be used to assist the production of custom-fit apparel. This is an effort to reduce the cost of expensive 3-D body scanners and to make the system available to the user at home.Design/methodology/approachA single camera body measurement system is proposed, implemented, and pilot tested. This system involves a personal computer and a webcam operating within a space of controlled lighting. The system will take two images of the user, extract body silhouettes, and perform measurement extraction. The camera is automatically calibrated using the software each time of scanning considering the scanning space. The user will select a front view and a side view among the images captured, and specify the height. In this pilot study, 31 subjects were recruited and the accuracy of 8 human body measurements were compared with the manual measurements and measurements extracted from a commercial 3-D body scanner.FindingsThe system achieved reasonable measurement performance within 10 percent accuracy for seven out of the eight measurements, while four out of eight parameters obtained a performance similar to the commercial scanner. It is proved that human body measurement extraction can be done using inexpensive equipment to obtain reasonable results.Originality/valueThis study is aimed at developing a proof-of-concept for inexpensive body scanning system, with an effort to benchmark measurement accuracy, available to an average user providing the ability to acquire self-body measurements to be used to purchase custom-fit apparel. This system can potentially boost the customization of apparel and revolutionize online shopping of custom-fit apparel.

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Magdziak, Marek. "Selection of the Best Model of Distribution of Measurement Points in Contact Coordinate Measurements of Free-Form Surfaces of Products". Sensors 19, n. 24 (4 dicembre 2019): 5346. http://dx.doi.org/10.3390/s19245346.

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The article presents a new method for determining the distribution of measurement points, which can be used in the case of contact coordinate measurements of curvilinear surfaces of products. The developed method is based on multi-criteria decision analysis. In the case of the new method, the selection of the distribution of measurement points on free-form surfaces is carried out based on the analysis of five different criteria. The selection of the best model of the distribution of measurement points results from the accuracy of coordinate measurements, the time needed to complete measurement tasks, the number of measurement points, the accuracy of the substitute surface representing the measured free-form surface and the area where measurement points are located. The purpose of using the developed method of the distribution of measurement points is to increase the performance of coordinate measurements primarily by increasing the automation of strategy planning of measurements of curvilinear surfaces and improving the accuracy of measurements of free-form surfaces of products. The new method takes into account various aspects of coordinate measurements to determine the final model of the distribution of measurement points on measured surfaces of products, thereby increasing the probability of the proper determination (i.e., identifying the highest deviations of a product) of the location of measurement points on the surfaces of a measured object. The paper presents an example of the application of the created method, which concerns the selection of the best model of the distribution of measurement points on a selected free-form surface. This example is based on, among others, the results of experimental investigations, which were carried out by using the ACCURA II coordinate measuring machine equipped with the VAST XXT measuring probe and the Calypso measurement software. The results of investigations indicate a significant reduction in time of coordinate measurements of products when using the new method for determining the distribution of measurement points. However, shortening the time of coordinate measurements does not reduce their accuracy.

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Bezdíček, Vladimír, Rostislav Dandoš, Miroslav Konečný, Juraj Kotrbanec, Tomáš Král e Andrea Wlochová. "ORIENTATION MEASUREMENT WITH GYROTHEODOLITE". Geodesy and cartography 44, n. 3 (16 ottobre 2018): 100–105. http://dx.doi.org/10.3846/gac.2018.2683.

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The article deals with the principle of using gyrotheodolite in connection and orientation measurements. It describes orientation measurements with gyrotheodolite, provides basic information about the device and explains how it works. The first part describes gyrotheodolite and methods of determining astronomical true north. The workflow for measurement and subsequent data processing is described below. In the second part, two orientation measurements are described and processed. Finally, the accuracy achieved and the possibility to use the device for activities other than mine measurement are assessed.

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Koga, Harumichi, Katsuhiko Taki e Ayano Masugi. "Efficient Measurement Method: Development of a System Using Measurement Templates for an Orthodontic Measurement Project". Software 2, n. 2 (12 maggio 2023): 276–91. http://dx.doi.org/10.3390/software2020013.

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We have developed a new system for measuring dental, gnathic, and facial areas with cephalogram-equivalent images created from computed tomographic imaging data. An advantage of this collaborative system is that a measurement template and automated processing are used. First, experienced orthodontists were provided with the measurement templates; they then moved the measurement markers to the specified landmarks on the cephalogram in the template. Subsequently, the program automatically detected the coordinates of the markers and calculated the distance between those coordinates. The appropriate use of this system leads to highly accurate results in large quantities of measurements in a short time by means of both manual and automatic processing. The system was developed to contribute to worldwide research into dental and craniofacial measurements; the research involved 500 patients, and the system worked successfully.

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ONO, Yuichi. "OS7-17 Stress Measurement Using EBSD Analysis of Grown Grains in Electrodeposited Nickel Foil(Stress and strain measurement V,OS7 Stress and strain measurement,MEASUREMENT METHODS)". Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2015.14 (2015): 108. http://dx.doi.org/10.1299/jsmeatem.2015.14.108.

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Pillarz, Marc, Axel von Freyberg, Dirk Stöbener e Andreas Fischer. "Gear Shape Measurement Potential of Laser Triangulation and Confocal-Chromatic Distance Sensors". Sensors 21, n. 3 (30 gennaio 2021): 937. http://dx.doi.org/10.3390/s21030937.

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The demand for extensive gear shape measurements with single-digit µm uncertainty is growing. Tactile standard gear tests are precise but limited in speed. Recently, faster optical gear shape measurement systems have been examined. Optical gear shape measurements are challenging due to potential deviation sources such as the tilt angles between the surface normal and the sensor axis, the varying surface curvature, and the surface properties. Currently, the full potential of optical gear shape measurement systems is not known. Therefore, laser triangulation and confocal-chromatic gear shape measurements using a lateral scanning position measurement approach are studied. As a result of tooth flank standard measurements, random effects due to surface properties are identified to primarily dominate the achievable gear shape measurement uncertainty. The standard measurement uncertainty with the studied triangulation sensor amounts to >10 µm, which does not meet the requirements. The standard measurement uncertainty with the confocal-chromatic sensor is <6.5 µm. Furthermore, measurements on a spur gear show that multiple reflections do not influence the measurement uncertainty when measuring with the lateral scanning position measurement approach. Although commercial optical sensors are not designed for optical gear shape measurements, standard uncertainties of <10 µm are achievable for example with the applied confocal-chromatic sensor, which indicates the further potential for optical gear shape measurements.

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Schroeder, Stefan, Sebastian Jaeger, Jonas Schwer, Andreas Martin Seitz, Isabell Hamann, Michael Werner, Christoph Thorwaechter et al. "Accuracy measurement of different marker based motion analysis systems for biomechanical applications: A round robin study". PLOS ONE 17, n. 7 (11 luglio 2022): e0271349. http://dx.doi.org/10.1371/journal.pone.0271349.

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Introduction Multiple camera systems are widely used for 3D-motion analysis. Due to increasing accuracies these camera systems gained interest in biomechanical research areas, where high precision measurements are desirable. In the current study different measurement systems were compared regarding their measurement accuracy. Materials and methods Translational and rotational accuracy measurements as well as the zero offset measurements of seven different measurement systems were performed using two reference devices and two different evaluation algorithms. All measurements were performed in the same room with constant temperature at the same laboratory. Equal positions were measured with the systems according to a standardized protocol. Measurement errors were determined and compared. Results The highest measurement errors were seen for a measurement system using active ultrasonic markers, followed by another active marker measurement system (infrared) having measurement errors up to several hundred micrometers. The highest accuracies were achieved by three stereo camera systems, using passive 2D marker points having errors typically below 20 μm. Conclusions This study can help to better assess the results obtained with different measurement systems. With the focus on the measurement accuracy, only one aspect in the selection of a system was considered. Depending on the requirements of the user, other factors like measurement frequency, the maximum analyzable volume, the marker type or the costs are important factors as well.

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Puzovic, Slavisa, Branko Koprivica, Alenka Milovanovic e Milic Djekic. "Analysis of measurement error in direct and transformer-operated measurement systems for electric energy and maximum power measurement". Facta universitatis - series: Electronics and Energetics 27, n. 3 (2014): 389–98. http://dx.doi.org/10.2298/fuee1403389p.

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Analysis of error in measuring electric energy and maximum power within direct and half-indirect measurement system at the voltage of 0.4kV is presented in the paper. The analysis involved all the elements of the measurement system, i.e. calibration and testing of the transformer-operated and direct digital energy meters and measuring current transformers. This equipment was also used for measurements in the transformer substation aiming at error analysis at measurements made under the real conditions. The results obtained show significant negative measurement error introduced by the energy meters under overload conditions. Energy meters have lower values of both the consumed electric energy and maximum power in this operating mode, which can be interpreted as a loss.

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Müller, Andreas Michael, Lorenz Butzhammer, Florian Wohlgemuth e Tino Hausotte. "Automated evaluation of the surface point quality in dimensional X-ray computed tomography". tm - Technisches Messen 87, n. 2 (25 febbraio 2020): 111–21. http://dx.doi.org/10.1515/teme-2019-0116.

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AbstractX-ray computed tomography (CT) enables dimensional measurements of numerous measurands with a single scan, including the measurement of inner structures. However, measurement artefacts complicate the applicability of the technology in some cases. This paper presents a methodology to assess the surface point quality of computed tomography measurements without the requirement of a CAD model. Measurement artefacts lowering the surface point quality can therefore automatically be detected. The correlation of quality values with the random measurement error is demonstrated. The presented method can in principle be used to weight single fit points to reduce the measurement uncertainty of CT measurements.

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Prokopchina, Svetlana V. "ECOSYSTEM MEASUREMENTS BASED ON BAYESIAN INTELLIGENT TECHNOLOGIES". SOFT MEASUREMENTS AND COMPUTING 1/2, n. 74 (2024): 5–13. http://dx.doi.org/10.36871/2618-9976.2024.01-2.001.

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The article proposes a methodological justification and principles of the organization of ecosystem measurements as a new trend in measurement theory. It is shown that ecosystem measurements are always implemented in conditions of significant uncertainty of models and data. In this regard, a regularizing Bayesian approach (RBP) and technologies based on it, which are focused on uncertainty conditions, are proposed for their organization. It is shown that the methods and principles of ecosystem measurements, as branches of the Bayesian intelligent measurement (BII) direction, meet all the criteria of classical multiparametric measurements: compatibility, repeatability (stability), traceability of measurement solutions. The specific properties of all components of ecosystem measurement processes are determined: models of ecosystem measurement objects, models of reference objects and methodologies for implementing comparison schemes. It is established that the main difference from the measuring schemes of the classical type is the presence of components due to the influence of the subjects of the meters in all the above components of the global measurement scheme. Analytical dependencies describing global measurements are obtained in the form of measurement equations in conceptual and optimization forms. The article provides examples of conceptual models of ecosystem measurement objects based on BII in problems of geopolitics, macroeconomics, interethnic systems and relations.

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Shi, Zhao Yao, Jia Chun Lin e Michael Paul Krystek. "Uncertainty Analysis of Helical Deviation Measurements". Key Engineering Materials 437 (maggio 2010): 212–16. http://dx.doi.org/10.4028/www.scientific.net/kem.437.212.

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The helix is a complex geometrical element. During the process of a dynamical measurement of the helical deviations, many factors, including the machine and the environment, lead to measurement errors. Although ISO as well as national standards stipulate the tolerances and assessment methods for helical deviations, these standards contribute little to the uncertainty calculations concerning such measurements. According to the Guide to the Expression of Uncertainty in Measurement (GUM), all measurement results must have a stated uncertainty associated to them. But in most cases of helical deviation measurements, no uncertainty value is given, simply because no measurement uncertainty calculation procedure exists. For the case of helical deviation measurements on a Computer Numeric Control (CNC) polar coordinate machine, this paper analyses in detail all kinds of factors contributing to the measurement uncertainty, and gives the calculation procedure of the measurement uncertainty of helical deviation. As an example, the calculation of the measurement uncertainty of the helical deviations of a worm is presented.

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Krug, F., S. Braun e P. Russer. "A novel quasi-peak-detector for time-domain EMI-measurements". Advances in Radio Science 2 (27 maggio 2005): 27–32. http://dx.doi.org/10.5194/ars-2-27-2004.

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Abstract. In this paper, an advanced ultra-fast, broadband time domain EMI measurement system is described. Measurements were performed in the 30–1000MHz range. The digital signal processing of EMI measurements allows to emulate in real-time the modes of conventional analogous equipment, e.g. Peak-, Average-, RMS- and Quasi-Peak- Detector. With the presented time domain measurement system the measurement time can be reduced by a factor of 10. A novel signal recording routine for time-domain EMI (TDEMI) measurements and Quasi-Peak-Detection is described. Measurement results obtained from the investigation of a drillmachine, monitor and laptop obtained with the timedomain electromagnetic interference (TDEMI) measurement system are discussed. The results obtained with the described system have been compared with measurements performed with a conventional EMI receiver.

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Brenner, Alex, Tobias Hirsch, Marc Röger e Robert Pitz-Paal. "State-of-the-Art Measurement Instrumentation and Most Recent Measurement Techniques for Parabolic Trough Collector Fields". Energies 14, n. 21 (1 novembre 2021): 7166. http://dx.doi.org/10.3390/en14217166.

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The presented review gives reliable information about the currently used measurement instrumentation in parabolic trough fields and recent monitoring approaches. The usually built-in measurement equipment in the solar field, clamp-on systems for flexible measurements of temperature and flow, solar irradiance measurements, standard meteorological equipment, laboratory devices for heat transfer fluid analyses and instruments related to the tracking of solar collector assemblies are presented in detail. The measurement systems are reported with their measurement uncertainty, approximate costs and usual installation location for the built-in instrumentation. Specific findings related to the installation and operation of the measurement devices are presented. The usually installed instrumentation delivers a lot of measurements all over the field at the expense of measurement accuracy, compared to special test facility equipment. Recently introduced measurement approaches can improve the standard instrumentation in terms of accuracy, frequency, spatial distribution or can even extend the amount of measurands. The information about available measurands is the basis for future operation and maintenance solutions based on data-driven approaches.

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Moffat, R. J. "The measurement chain and validation of experimental measurements". ACTA IMEKO 3, n. 1 (7 maggio 2014): 16. http://dx.doi.org/10.21014/acta_imeko.v3i1.196.

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<p>This is a reissue of a paper which appeared in ACTA IMEKO 1973, Proceedings of the 6th Congress of the International Measurement Confederation, "Measurement and instrumentation", 17.-23.6.1973, Dresden, vol. 1, pp. 45-53.</p><p>The paper witnesses the sophisticated discussion that, well before the publication of the Guide to the Expression of Uncertainty in Measurement (GUM), was active in the measurement science community around the subject of error and uncertainty, and its consequences on the structure of the measuring process and the way it is performed.</p>

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Nonaka, Kyoya, Tadashi Koshizuka e Kunihiko Hidaka. "Current Measurement at Prospective Transient Recovery Voltage Measurements". IEEJ Transactions on Power and Energy 140, n. 9 (1 settembre 2020): 700–704. http://dx.doi.org/10.1541/ieejpes.140.700.

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Vulevic, Branislav, Cedomir Belic e Luka Perazic. "Measurement uncertainty in broadband radiofrequency radiation level measurements". Nuclear Technology and Radiation Protection 29, n. 1 (2014): 53–57. http://dx.doi.org/10.2298/ntrp1401053v.

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For the evaluation of measurement uncertainty in the measurement of broadband radio frequency radiation, in this paper we propose a new approach based on the experience of the authors of the paper with measurements of radiofrequency electric field levels conducted in residential areas of Belgrade and over 35 municipalities in Serbia. The main objective of the paper is to present practical solutions in the evaluation of broadband measurement uncertainty for the in-situ RF radiation levels.

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Gustavsen, Bjorn. "Eliminating Measurement Cable Effects From Transformer Admittance Measurements". IEEE Transactions on Power Delivery 31, n. 4 (agosto 2016): 1609–17. http://dx.doi.org/10.1109/tpwrd.2016.2536704.

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Johannsen, K. G. "Measurement of satellite communication parameters: satellite antenna measurements". IEEE Transactions on Instrumentation and Measurement 37, n. 2 (giugno 1988): 285–91. http://dx.doi.org/10.1109/19.6068.

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Okamoto, T., e T. Tanaka. "Novel Partial Discharge Measurement Computer-Aided Measuremnet Systems". IEEE Transactions on Electrical Insulation EI-21, n. 6 (dicembre 1986): 1015–19. http://dx.doi.org/10.1109/tei.1986.349017.

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Zheng, Huaixiu, Arpit Dua e Liang Jiang. "Measurement-only topological quantum computation without forced measurements". New Journal of Physics 18, n. 12 (31 luglio 2017): 123027. http://dx.doi.org/10.1088/1367-2630/aa50bb.

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