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Interpolation characteristics and noise sensitivity of neural network based inspection of machined surfaces

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2 Author(s)
Villalobos, L. ; Dept. of Electr. Eng., Case Western Reserve Univ., Cleveland, OH, USA ; Gruber, Sheldon

Determining the quality of surfaces by utilizing scattered laser light that is examined with a neural network is discussed. Features are extracted from the scattered angular spectrum and then used as inputs to a hierarchical neural net. The net is trained by a selected set of machined surfaces whose quality has been independently established. These samples are repeatedly presented to the sensors, and the network will, each time, make a decision about the surface roughness which is then compared to the correct answer. The error is used to modify the connection weights. Following this training period, the net is able to identify the quality of surfaces presented to it, even in the presence of noise caused by poor illumination. Experimental results from a set of lapped surfaces are discussed with regard to the fusion of different features in order to obtain an adequate measure of surface roughness using the neural network. It is shown that the system is able to interpolate between the surfaces of different preparation and estimate the roughness parameter in the micron age

Published in:

Robotics and Automation, 1990. Proceedings., 1990 IEEE International Conference on

Date of Conference:

13-18 May 1990

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