Assessing Multisensor Measurement Accuracy

Uncertainty of measurement is defined in the International Vocabulary of Basic and General Terms in Metrology (VIM) as a parameter, associated with the result of a measurement, that characterizes the dispersion of the values that could reasonably be attributed to the measurand. If everyone uses a di...

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Bibliographic Details
Published inQuality (Wheaton) Vol. 45; no. 3; pp. 28 - 33
Main Author Charlton, Tom
Format Magazine Article
LanguageEnglish
Published Troy BNP Media 01.03.2006
Subjects
Accuracy
Guidelines
Measuring instruments
Sensors
Uncertainty
United States > US
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Summary:Uncertainty of measurement is defined in the International Vocabulary of Basic and General Terms in Metrology (VIM) as a parameter, associated with the result of a measurement, that characterizes the dispersion of the values that could reasonably be attributed to the measurand. If everyone uses a different measurement to evaluate instruments' intrinsic uncertainty, the results cannot be compared. Currently the manufacturers of multisensor machines and plain optical CMMs without multisensor capability, have taken a variety of approaches to presenting the "accuracy" of their machines. These are mostly variations of ISO 10360-2, but they present some real problems for optical systems. In using uncertainty values to assess the performance of a multisensor machine, the following steps are prudent. 1. Assess your real measurement needs for the system. 2. Be sure to get complete specifications for the intended use of the system. 3. Ask for details of the procedures for verifying the specifications. 4. Be a skeptic.
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ISSN:0360-9936
1937-4410