Method and system for monitoring quality of phosphate coating

Details Method and system for monitoring quality of phosphate coating Method and system for monitoring quality of phosphate coating

G - Physics

01

N

G01N 27/00 (2006.01) G01N 27/416 (2006.01) G01N 27/49 (2006.01)

Patent

CA 2093704

A method and system for monitoring the quality of a phosphate coating on a metal surface having a large surface area. The method comprises applying a current or potential between the metal surface and one or more counter electrodes while they are in the phosphating solution and superimposing a constant ac signal thereon. An ac impedance spectra is obtained by measuring the ac potential between the metal substrate and one or more reference electrodes located between the counter electrode and the substrate. The ac impedance spectra provide an indication of defects in the phosphate coating even when the defects are located within a relatively small region of the total surface area of the metal surface.

L'invention est une méthode de dissipation passive de la chaleur produite dans un élément optique de laser, cette méthode utilisant les faces transmissives optiques de l'élément en question. La chaleur est dissipée au moyen de dissipateurs de chaleur transmettant la lumière, ou d'autres matériaux conducteurs de chaleur placés près des surfaces transmissives de l'élément optique. La chaleur est extraite de l'élément optique dans une direction parallèle à la direction de propagation de l'énergie, ce qui minimise les problèmes reliés aux gradients de température. Les dispositifs utilisant des éléments optiques tels que des cristaux de conversion de fréquence non linéaires et des cristaux de laser peuvent utiliser la méthode de dissipation de chaleur de la présente invention pour améliorer leur performance. La chaleur est transférée au milieu conducteur de chaleur par contact direct, ou par l'intermédiaire d'espaces étroits remplis de gaz placés entre l'élément optique et le matériau conducteur de chaleur.

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