Abstract
Agitation of two immiscible liquids or solid-liquid suspension is a frequent operation in chemical and metallurgical industries. The sizes of particles, bubbles or droplets can be determined by the Image Analysis Technique. It is known that the quality of captured images depends significantly on the original image background that is mainly affected by the type of the light source. The aim of this contribution is to investigate the effect of light source type on image quality. The four types of light sources were tested: 1) 1000 W halogen lamp, 2) 72 W LED bar panel, 3) 60 W LED chip, and 4) 90 W LED chip. The illumination intensity and image background quality were investigated for each tested light sources. The effect of the shutter speed on evaluated particle sizes was tested using monodisperse spherical calibration particles having diameter of 1.19 mm. The difference observed between particle sizes evaluated by image analysis for given light source and declared calibration particle diameter was used as a measure of light source quality.
Highlights
The in-situ measurement and evaluation of drop sizes via Image Analysis (IA) has been widely used by many researchers 1, 2
When the image analysis is used for investigation of liquid-liquid dispersion the cleaning of the vessel is required before and after every measurement run
The multi-point character of light source is clearly visible for commercial LED bar panel (Fig. 4b)
Summary
The in-situ measurement and evaluation of drop sizes via Image Analysis (IA) has been widely used by many researchers 1, 2. According to Kysela and Formánek 3 the following parameters are important for image capturing and analysis: a) shutter speed, b) frame rate and c) focus depth. Kysela and Formánek 3 estimated shutter speed and minimum frame rate for drops measurement via image analysis technique on the basis of velocity flow analysis in the investigated area. In our previous work 4 we found that the quality of captured images depends significantly on the raw image background that is mainly affected by the type of the light source. The research was focused on quantification of illumination intensity, image background quality and effect of the shutter speed on evaluated particle sizes for tested light sources.
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