Application of the continuous wavelet transform in periodic error compensation

Chao Lu, John R. Troutman, Tony L. Schmitz, Jonathan D. Ellis, Joshua A. Tarbutton

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

This paper introduces a new discrete time continuous wavelet transform (DTCWT)-based algorithm, which can be implemented in real time to quantify and compensate periodic error for constant and non-constant velocity motion in heterodyne displacement measuring interferometry. It identifies the periodic error by measuring the phase and amplitude information at different orders (the periodic error is modeled as a summation of pure sine signals), reconstructs the periodic error by combining the magnitudes for all orders, and compensates the periodic error by subtracting the reconstructed error from the displacement signal measured by the interferometer. The algorithm is validated by comparing the compensated results with a traditional frequency domain approach for constant velocity motion. The algorithm demonstrates successful reduction of the first order periodic error amplitude from 4 nm to 0.24 nm (a 94% decrease) and a reduction of the second order periodic error from 2.5 nm to 0.3 nm (an 88% decrease). The algorithm also reduces periodic errors for non-constant velocity motion overcoming limitations of existing methods.

Original languageEnglish (US)
Pages (from-to)245-251
Number of pages7
JournalPrecision Engineering
Volume44
DOIs
StatePublished - Apr 1 2016
Externally publishedYes

Keywords

  • Heterodyne
  • Interferometry
  • Periodic error
  • Signal processing
  • Wavelet transform

ASJC Scopus subject areas

  • Engineering(all)

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