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Journal of Applied Sciences

Year: 2011 | Volume: 11 | Issue: 15 | Page No.: 2823-2829
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Authors

A. Khorramnazari

H. Golnabi

Keywords

Research Article

Object Surface Characteristics Monitoring using Light Reflection Measurements

A. Khorramnazari and H. Golnabi
Design and operation of a light reflection system for surface profiling is reported in this article. This system consists of a double-fiber optical probe and a mechanical scanning system. In this arrangement one fiber transmits the source light to the object surface and the second one transmits the light reflected off the surface to a photodetector. By scanning the double-fiber probe assembly in one direction the reflection properties of different plane surfaces are investigated. The reported system can be used to monitor the surface profile of target surfaces made from metallic and non-metallic materials. Obtained results show that the reported method can be utilized to obtain structural information from the object surface with different materials and coatings. The variation of the background light for about 160 m sec scanning time is from 4.35 mV to about 4.75 mV that shows a very good time stability of the detection system. Considering a typical signal value of 30 mV an average signal-to-noise ratio of approximately 7 is obtained for this experiment. The reproducibility error is approximately 0.82% for the full scale measurements which is a good figure of merit. The reported opto-mechanical system provides a simple method for the object shape study and determination of different surface structures through the optical reflection monitoring.
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