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Evaluation of the measuring errors of the surface properties of substances with an optical-digital diagnostic system

The capabilities of the hybrid optical/digital system for nondestructive testing of high- temperature melts, liquid metals, and liquids by sessile drop method were studied. The spatial- temporal noises and spatial (geometric) noises of the system were analyzed and measured. The spatial-temporal noise caused by sessile drop's lateral oscillation were marked and measured. The experimental dependencies between noises variances and relative illumination of sessile drop images are obtained. The functional connection between the maximum variance of the sessile drop's random lateral oscillation noise and the surface tensions of studied substances was found.