Measurement of washboarding of corrugated cardboard using digital image profilometry

Michael H. Reich; Russell Allan

doi:10.1117/12.232235

21 February 1996 Measurement of washboarding of corrugated cardboard using digital image profilometry

Michael H. Reich, Russell Allan

Proceedings Volume 2665, Machine Vision Applications in Industrial Inspection IV; (1996) https://doi.org/10.1117/12.232235
Event: Electronic Imaging: Science and Technology, 1996, San Jose, CA, United States

Abstract

A prototype digital image profilometer has been constructed to measure washboarding of corrugated cardboard. The profilometer consists of a diode laser, collimating optics, a grating and CCD camera. The laser beam is projected through the grating to produce straight bars that illuminate the sample at 90 degrees to the undulations. The deformation of the bars projected onto the sample, tilted at 75 degrees to the camera, is analyzed using Fourier analysis to produce a surface profile of the sample. A series of 1-D Fourier transforms are calculated from the intensity profile for successive scan lines at right angles to the bars projected onto the surface. The average depth profile for each scan line is then derived, after phase unwrapping, from the phase of the dominant frequency of the spatial frequency spectrum. The profilometer can reliably measure washboarding to a depth resolution of less than 10 microns over an area of 20 cm by 20 cm in less than 4 seconds on a 486DX2/66 computer.

Citation Download Citation

Michael H. Reich and Russell Allan "Measurement of washboarding of corrugated cardboard using digital image profilometry", Proc. SPIE 2665, Machine Vision Applications in Industrial Inspection IV, (21 February 1996); https://doi.org/10.1117/12.232235

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