High-accuracy optical measurement of flatness for large objects

Pavageau, S.; Dallier, R.; Servagent, Noël; Bosch, Thierry

doi:10.1088/0957-0233/14/12/011

Cited by 8 publications

(1 citation statement)

References 11 publications

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“…The flatness of a flat surface can be measured traditionally by a coordinate measuring machine or by an electronic level. Some non-contact flatness measurement systems with the help of an image processing system, have been developed by projecting a parallel beam or the structured fringes on to the test specimen, and then analyzed by the developed software based on the triangulation principle or the phase shifting methodology [2][3][4]. The stylus instrument and the light scattering method are mainly used to measure the surface roughness.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Flatness and Surface Roughness Measurement of a Plastic Sheet Using a Fan-Shaped Laser Beam Scanning System

Shiou

Deng

2008

KEM

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A fan-shaped laser beam scanning measuring system based on the triangulation principle, was newly developed in this study to measure simultaneously the flatness and the surface roughness of a surface plate with good reflectivity after a suitable calibration. The developed system mainly consists of a micro-focus fan-shaped line laser, an image processing system, a PC-based 3-axis machine, and a PC. The height value of the object can be calculated, based on the offset between the position projected onto the object and the position projected onto the platform, after carrying out the height calibration with gauge blocks. According to the scattering theorem, a correlation between the surface roughness of the test object measured with a precision stylus instrument and the average fringe width projected onto the test object surface, has been constructed.

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Section: Introductionmentioning

confidence: 99%

Simultaneous Flatness and Surface Roughness Measurement of a Plastic Sheet Using a Fan-Shaped Laser Beam Scanning System

Shiou

Deng

2008

KEM

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A new algorithm for large surfaces profiling by fringe projection

Pavageau

Dallier

Servagent

et al. 2004

Sensors and Actuators A: Physical

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7 pagesA method for profiling surface objects based on the fringe projection method and a phase shifting algorithm is described. The application of this method to large surfaces is problematic since the calibration step requires the use of a reference plane as large as the object. A new algorithm based on least-squares method has also been developed to bypass this calibration step, and so the use of a reference plane. First experimental results on a carbon panel and on a parabolic aerial are presented to show the validity of the proposed algorithm. Accuracy of 1mm has been obtained for an object of 1m and 20 cm long, while sensitivity has been proved to be of the order of 100 m

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