Assessing measurement control: experiences with nondestructive assay methods

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Demonstration of stability or control of a measurement process over time is often required for critical processes. Measurement control is monitored by calculating measurement errors for a collection of comparison standards over time and producing a Shewhart control chart. However, measurement errors inherently occur one-at-a-time and not in batches. Additionally there is often a non-deterministic drift in the mean measurement error. These facts make it challenging to develop warning and alarm limits for a control chart. Previous studies have suggested using the mean squared successive difference to estimate the variance of one-at-a-time data. This technique can also reduce or eliminate ... continued below

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13 pages; Other: FDE: PDF

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Glosup, J., LLNL August 11, 1997.

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Description

Demonstration of stability or control of a measurement process over time is often required for critical processes. Measurement control is monitored by calculating measurement errors for a collection of comparison standards over time and producing a Shewhart control chart. However, measurement errors inherently occur one-at-a-time and not in batches. Additionally there is often a non-deterministic drift in the mean measurement error. These facts make it challenging to develop warning and alarm limits for a control chart. Previous studies have suggested using the mean squared successive difference to estimate the variance of one-at-a-time data. This technique can also reduce or eliminate estimation bias due to a fluctuating mean. Application of a control charting methodology based on the mean squared successive difference is demonstrated using data from the nondestructive assay of nuclear materials, and the performance and potential limitations of the method are explored.

Physical Description

13 pages; Other: FDE: PDF

Notes

OSTI as DE00016408

Source

  • American Statistical Association's 1997 Joint Statistical Meeting, Anaheim, CA (US), 08/10/1997--08/13/1997; Other Information: Supercedes report DE98051027; PBD: 11 Aug 97

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  • Other: DE98051027
  • Report No.: UCRL-JC-128387
  • Report No.: CONF-9708110*--
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 16408
  • Archival Resource Key: ark:/67531/metadc619619

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  • August 11, 1997

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  • June 16, 2015, 7:43 a.m.

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  • Jan. 3, 2017, 6:25 p.m.

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Glosup, J., LLNL. Assessing measurement control: experiences with nondestructive assay methods, article, August 11, 1997; (digital.library.unt.edu/ark:/67531/metadc619619/: accessed January 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.