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High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
Published on: December 3, 2013
Optimization of fringe spacing in a digital flatness test
1National Research Laboratory of Metrology, 1-1-4, Umezono, Sakura-mura, Niihari-gun, Ibaraki 305, Japan.
Applied Optics
|August 1, 1985
Summary
Optimizing fringe spacing in digital fringe analysis using information theory maximizes measurement data. This digital fringe analysis method enhances resolution for flatness testing.
Area of Science:
- Optical metrology
- Information theory applied to image analysis
Background:
- Digital fringe analysis is crucial for flatness testing.
- Maximizing measurement information in fringe images is key to accuracy.
Purpose of the Study:
- To describe the optimum fringe spacing condition for flatness testing using digital fringe analysis.
- To apply information theory to determine this optimum condition.
Main Methods:
- Discussing the relationship between resolution and data sampling number.
- Deriving optimum fringe spacing using average information entropy.
- Performing numerical analysis for Fast Fourier Transform (FFT) fringe analysis.
- Conducting experiments with a liquid level flatness tester.
Main Results:
- The derived condition for optimum fringe spacing was evaluated numerically.
- Experimental results demonstrated superior high space frequency resolution.
- The study confirms the effectiveness of the information theory-based approach.
Conclusions:
- The optimum fringe spacing condition, derived from information theory, significantly enhances measurement information in fringe images.
- This method improves resolution in flatness testing applications, as validated by experimental results.
