.Assessment method of numerical integration used in measuring profile based on ultra-precise thin light beam scanning[J].Optoelectronics Letters,2009,5(6):476-480 |
Assessment method of numerical integration used in measuring profile based on ultra-precise thin light beam scanning |
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Abstract: |
In order to improve the precision of profile measurement based on ultra-precise thin light beam scanning, an assessment method
that compares different numerical integration algorithms in frequency-domain is put forward. The compared numerical integration
methods are regarded as recursive digital filters. Through comparing their functions of frequency response in frequency-domain,
the delivering role of noise with different frequencies can be analyzed directly and clearly in the process of integrating
measured slope data. Analyzing results show that the method of cubic spline is better than trapezoidal, Simpson and 3/8 Simpson
rules. |
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