Uncertainty and accuracy in physical measurements by Harry H. Ku

Cover of: Uncertainty and accuracy in physical measurements | Harry H. Ku

Published by U.S. Dept. of Commerce, National Institute of Standards and Technology in Gaithersburg, MD .

Written in English

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Subjects:

  • Physical measurements.

Edition Notes

Book details

StatementHarry H. Ku.
SeriesNIST special publication -- 805
ContributionsNational Institute of Standards and Technology (U.S.)
The Physical Object
Paginationiii, 9 p. ;
ID Numbers
Open LibraryOL17101936M
ISBN 1001603525X

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The book goes in-depth into explaining national and international measurement systems and standards, and includes a complete chapter on calibration and measurement trace ability. Measurement Uncertainty will show how to evaluate various uncertainties in measurements using several approaches including international consensus.

Get this from a library. Uncertainty and accuracy in physical measurements. [Harry H Ku; National Institute of Standards and Technology (U.S.)]. All measurements of physical quantities are affected by uncertainty. Understanding the origin of uncertainty, evaluating its extent and suitably taking it into account in data analysis is essential for assessing the degree of accuracy of phenomenological relationships and physical laws in both scientific research and technological : Springer-Verlag New York.

Kimothi shows how the accuracy of measurements affects all of us in trade, commerce, safety, health care, environmental protection, and more. External and internal customers, along with regulatory agencies, often prescribe measurement accuracy requirements.

This book helps to sort out the current issues surrounding measurement reliability.5/5(1). 4 USES OF UNCERTAINTY ANALYSIS (I) • Assess experimental procedure including identification of potential difficulties – Definition of necessary steps – Gaps • Advise what procedures need to be put in place for measurement • Identify instruments and procedures that control accuracy and precision – Usually one, or at most a small number, out of the large set ofFile Size: KB.

All measurements of physical quantities are affected by uncertainty. Understanding the origin of uncertainty, evaluating its extent and suitably taking it into account in data analysis is essential for assessing the degree of accuracy of phenomenological relationships and physical laws in both scientific research and technological applications.

Accuracy and Precision. Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results.

Measurements are said to be precise if they yield very similar results when repeated in the same manner. All measurements are subject to uncertainty, and a measurement result is complete only when it is accompanied by a statement of the associated uncertainty. It applies to predictions of future events, to physical measurements that have already been made, and to the unknown.

In this context, uncertainty depends on both the accuracy and. A Beginner’s Guide to Uncertainty of Measurement Stephanie Bell Centre for Basic, Thermal and Length Metrology National Physical Laboratory Abstract: The aim of this Beginner’s Guide is to introduce the subject of measurement uncertainty.

Every measurement is subject File Size: KB. Accuracy, Precision, and Uncertainty. The degree of accuracy and precision of a measuring system are related to the uncertainty in the measurements.

Uncertainty is a quantitative measure of how much your measured values deviate from a Uncertainty and accuracy in physical measurements book or expected value. Accuracy, Error, Precision, and Uncertainty. Introduction All measurements of physical quantities are subject to uncertainties in the measurements.

Of course, steps can be taken to limit the amount of uncertainty but it is always there. The book is divided into three parts and a series of appendices. Part I is devoted to a phenomenological introduction to measurement and uncertainty.

In Chap. 1, the direct and indirect procedures for measuring physical quantities are distinguished, and the unavoidability of uncertainty in measurements is established from the Size: 2MB.

Request PDF | On Jan 1,Paolo Fornasini and others published The Uncertainty in Physical Measurements | Find, read and cite all the research you need on ResearchGateAuthor: Paolo Fornasini.

All measurements of physical quantities are affected by uncertainty. Understanding the origin of uncertainty, evaluating its extent and suitably taking it into account in data analysis is essential for assessing the degree of accuracy of phenomenological relationships and physical laws in both scientific research and technological : Paolo Fornasini.

Kimothi shows how the accuracy of measurements affects all of us in trade, commerce, safety, health care, environmental protection, and more. External and internal customers, along with regulatory agencies, often prescribe measurement accuracy requirements. This book helps to sort out the current issues surrounding measurement reliability/5(3).

The uncertainty of measurement results is drawing attention of managers, metrologists and customers. the accuracy of measurements affects all of us in trade, commerce, safety, health care environmental protection and more.

the quality of these measurements are regulated by a variety of government agencies. Measurement also plays an important role in manufacturing and service organizations.

Uncertainty should reflect this, by using the term uncertainty as the sum of the inaccuracies of the instrument and of the reference. Unfortunately, some vendors play "specmanship" with these terms, and the worst ones don't even state the basis of their numbers—they don't state if the percentage they give is based on the full scale (FS) or.

Accuracy and Precision. Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to know both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same : OpenStaxCollege.

measurements of the same quantity; also the reliability or reproducibility of the result. The uncertainty estimate associated with a measurement should account. Uncertainty refers to epistemic situations involving imperfect or unknown applies to predictions of future events, to physical measurements that are already made, or to the unknown.

Uncertainty arises in partially observable and/or stochastic environments, as well as due to ignorance, indolence, or both. It arises in any number of fields, including insurance, philosophy, physics. Quantifying Uncertainty Foreword to the Third Edition QUAMP1 Page 2 level of measurement uncertainty is called the ‘target measurement uncertainty’ [H.7]).

The performance of the method is then quantified in terms of precision and trueness. Method validation is carried out to ensure. 19 MEASUREMENT UNCERTAINTY Overview This chapter discusses the evaluation and reporting of measurement uncertainty. Laboratory measurements always involve uncertainty, which must be considered when analytical results are used as part of a basis for making decisions.

Every measured result reported by a laboratory. The quality of the measurement result, its accuracy, is characterized by measurement uncertainty (or simply uncertainty), which defines an interval around the measured value C MEASURED, where the true value C TRUE lies with some probability.

The measurement uncertainty U itself is the half-width of that interval and is always non-negative. Accuracy and Precision. Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to know both the precision and the accuracy of their results.

Measurements are said to be precise if they yield very similar results when repeated in the same manner. Uncertainty and accuracy in physical measurements [microform] / Harry H.

Ku U.S. Dept. of Commerce, National Institute of Standards and Technology Gaithersburg, MD Wikipedia Citation Please see Wikipedia's template documentation for further citation fields that may be required. Unit 1 – Physical Quantities and Measurements Last Update: 04/17/ Physical Quantities and Units.

We define a physical quantity either by specifying how it is measured or by stating how it is calculated from other measurements. For example, we define distance and time by specifying methods for measuring them, whereas we define average speed by stating that it is calculated as Author: keramati.

Get this from a library. The uncertainty of measurements: physical and chemical metrology: impact and analysis. [Shri Krishna Kimothi] -- Annotation The uncertainty of measurement results is drawing attention of managers, metrologists and customers.

the accuracy of measurements affects all of us in trade, commerce, safety, health. ACCURACY, PRECISION AND UNCERTAINTY 4 the value of the measurement itself, and then multiply by %.

For example, we can calculate the precision in the measurements made by class 1 and class 2 as follows: Precision of Class 1's value: ( g ÷ g) x % = % Precision of Class 2's value: ( g ÷ g) x % = %File Size: KB.

Accuracy and Precision. Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to know both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same : OpenStax.

measurements have some degree of uncertainty that may come from a variety of sources. The process The process of evaluating this uncertainty associated with a File Size: 95KB. Part IV of the book has a somewhat different character from its three predecessors.

It is rather an olla podrida, a collection of five loosely related sections but bringing together information of value to those beginning to analyse the accuracy of physical measurements. To some extent, it is both supportive and repetitive of some of the main : Ralph H. Thomas. The uncertainty of measurement results is drawing attention of managers, metrologists and customers.

The accuracy of measurements affects all of us in trade, commerce, safety, health care environmental protection and more. The quality of these measurements is regulated by a variety of government agencies.

The uncertainty of measurement results is drawing attention of managers, metrologists and customers. The accuracy of measurements affects all of us in trade, commerce, safety, health care environmental protection and more. The quality of these measurements is regulated by a.

The Olympic sport of biathlon (Figure 1) is a cross-country ski race of 20 km in which the athletes stop on four occasions to shoot cm diameter bullets from a caliber rifle at targets. The sport requires not only great endurance, but exceptional accuracy as the athletes shoot on two occasions from the prone position (lying down) and on.

accuracy: how closely a measurement aligns with a correct value. exact number: number derived by counting or by definition. precision: how closely a measurement matches the same measurement when repeated. rounding: procedure used to ensure that calculated results properly reflect the uncertainty in the measurements used in the calculationAuthor: Shirley Wacowich-Sgarbi.

Accuracy: Accuracy describes the nearness of a measurement to the standard or true value, i.e., a highly accurate measuring device will provide measurements very close to the standard, true or known values.

Example: in target shooting a high score indicates the nearness to the bull's eye and is a measure of the shooter's Size: KB. Measurement accuracy of colour is an important parameter of colour measurement, especially in today’s society.

For instance, the sales of a particular brand of digital televisions (LCDs) are significantly influenced by their colour reproduction accuracy; i.e., which one has ‘better colour’ when viewed and compared in the store. Precision, Accuracy, Uncertainty, and Traceability The four terms in the title are often abused, sometimes confused, and generally not completely understood.

Therefore, the following short descriptive generic descriptions are offered as a first step to clarify this situation. Solving Problems in Physics. The three stages of the process for solving physics problems used in this textmap are as follows: Strategy: Determine which physical principles are involved and develop a strategy for using them to solve the problem.; Solution: Do the math necessary to obtain a numerical solution complete with units.; Significance: Check the solution to make sure it makes sense.

Chemists report as significant all numbers known with absolute certainty, plus one more digit that is understood to contain some uncertainty. The uncertainty in the final digit is usually assumed to be ±1, unless otherwise stated.

The following rules have been developed for counting the number of significant figures in a measurement or. All measured values of physical quantities are, however, a ected by uncertainty. Understanding the origin of uncertainty, evaluating its extent, and suitably taking it into account in data analysis, are fundamental steps for assessing the global accuracy of physical laws Price: $Uncertainty is a consequence of the unknown variables and limits to corrections for systematic effects, and is therefore expressed as a quantity, i.e.

an interval about the result. It is evaluated by combining a number of uncertainty components. The components are quantified either by evaluation of the results of several repeated measurements.

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