LASeRpapers - recent
papers of the Laser group
Chromatic
modulation technique for in-line surface monitoring and
diagnostic
J.
Cult. Heritage 1 (2000) S311–S316
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Jong-Myoung
Lee, Ken G. Watkins
Department of Engineering, University of Liverpool,
Brownlow Street, Liverpool L69 3GH, UK
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Abstract
– A
fast and reliable surface monitoring and diagnostic
technique is essential to develop a real-time automatic
control system for laser cleaning of artworks. In this
paper, an in-line surface monitoring and diagnostic
system based on chromatic modulation using tristimulus
detectors and fibre optics is presented. The system
produces measurements that are dependent on the spectral
signature of the incident light but are independent
of intensity. In order to demonstrate its usefulness
and versatility, the technique was applied to surface
monitoring in the laser cleaning of metal and stone.
Results show that the spectral parameters derived from
chromatic detection not only provide a clear indication
of the surface cleanliness and surface damage but also
much surface chromatic information from its versatility.
It is also shown in this paper how a chromatic modulation
technique may be utilised as a robust method for monitoring
and diagnosing the surface during laser cleaning.
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