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Practical in-situ calibration method for the non-linear output from a low cost eddy current sensor

Clough, David A, Fletcher, Simon, Longstaff, Andrew P. and Willoughby, Peter (2012) Practical in-situ calibration method for the non-linear output from a low cost eddy current sensor. In: 37th International Matador Conference, 25th-27th July 2012, Manchester, England. (In Press)

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      Increasing demand on manufacturing industry to produce tighter tolerance parts at a consistent rate means it is necessary to gain a greater understanding of machine tool capabilities, error sources and factors affecting asset availability. The machine tool spindle can be a significant contributor to both machine tool errors and failures resulting in a requirement for spindle error measurement.
      The use of eddy current non-contact displacement transducers is currently a popular method for measuring spindle error in a manufacturing environment. This is due to their resistance to harsh conditions where dust and coolant may be present. Unfortunately, many eddy current sensors have non-linear outputs that vary with target material and dimension. Typically, adjustments in the signal conditioning are provided to linearise the output, and calibrate the sensors for a specific target material.
      It is the purpose of this paper to assess current sensor calibration methods and highlight the potential for error in practical situations. To solve the problem, a method of in-situ calibration is presented, which uses the short range positional accuracy of the machine as a reference and least squares best fit of a low order polynomial. Validation is provided through the use of calibration test results and a practical example.

      Item Type: Conference or Workshop Item (Poster)
      Subjects: Q Science > Q Science (General)
      T Technology > TJ Mechanical engineering and machinery
      T Technology > TK Electrical engineering. Electronics Nuclear engineering
      Schools: School of Computing and Engineering
      School of Computing and Engineering > Centre for Precision Technologies > Engineering Control and Machine Performance Research Group
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      Depositing User: Naeem Mian
      Date Deposited: 09 Aug 2012 11:18
      Last Modified: 09 Aug 2012 11:24


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