Application of correlation curve fitting to improve the absolute displacement measurement using speckle correlation

2016 ◽  
Vol 46 ◽  
pp. 129-134 ◽  
Author(s):  
Mahsa Farsad ◽  
Gert Goch ◽  
Chris Evans
Keyword(s):  
Curve Fitting ◽  
Displacement Measurement ◽  
Correlation Curve ◽  
Absolute Displacement ◽  
Speckle Correlation ◽  
The Absolute

scholarly journals Integrated, Speckle-Based Displacement Measurement for Lateral Scanning White Light Interferometry

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2486
Author(s):  
Gert Behrends ◽  
Dirk Stöbener ◽  
Andreas Fischer
Keyword(s):  
White Light ◽  
Lateral Displacement ◽  
Displacement Measurement ◽  
Accurate Information ◽  
White Light Interferometry ◽  
Fully Integrated ◽  
Speckle Correlation ◽  
Dsc Measurements ◽  
Scanning White Light Interferometry ◽  
The Impact

Lateral scanning white light interferometry (LSWLI) is a promising technique for high-resolution topography measurements on moving surfaces. To achieve resolutions typically associated with white light interferometry, accurate information on the lateral displacement of the measured surface is essential. Since the uncertainty requirement for a respective displacement measurement is currently not known, Monte Carlo simulations of LSWLI measurements are carried out at first to assess the impact of the displacement uncertainty on the topography measurement. The simulation shows that the uncertainty of the displacement measurement has a larger influence on the total height uncertainty than the uncertainty of the displacing motion itself. Secondly, a sufficiently precise displacement measurement by means of digital speckle correlation (DSC) is proposed that is fully integrated into the field of view of the interferometer. In contrast to externally applied displacement measurement systems, the integrated combination of DSC with LSWLI needs no synchronization and calibration, and it is applicable for translatory as well as rotatory scans. To demonstrate the findings, an LSWLI setup with integrated DSC measurements is realized and tested on a rotating cylindrical object with a surface made of a linear encoder strip.

scholarly journals Robust sub-micrometer displacement measurement using dual wavelength speckle correlation

2015 ◽  
Vol 23 (11) ◽  
pp. 14960 ◽  
Author(s):  
Mahsa Farsad ◽  
Chris Evans ◽  
Faramarz Farahi
Keyword(s):  
Displacement Measurement ◽  
Dual Wavelength ◽  
Speckle Correlation

Measurement and Calibration of the Displacement and Pressure in Automatic Wheelset Assembly Machine

2012 ◽  
Vol 184-185 ◽  
pp. 296-300
Author(s):  
Jun Xiao ◽  
Rong Fang ◽  
Xin Cheng ◽  
Jian Bin Han
Keyword(s):  
Error Analysis ◽  
Measurement System ◽  
Curve Fitting ◽  
Pressure Sensor ◽  
Displacement Measurement ◽  
Zero Drift ◽  
Measurement Systems ◽  
System Pressure

This paper introduces the measurement systems of the oil cylinder in automatic wheelset assembly machine, theoretically analyzes the error of the displacement measurement system by curve fitting, and gets verification the error analysis in practice. This paper also calibrates pressure sensor from zero drift, slope of the output of the pressure sensor to guarantee the system pressure, and compensated pressure sensor value consistent.

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