Optical EngineeringExperimental prototype of a system to measure size and distribution of droplets in organic compound fogging on glass substrates
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We propose an alternative test for the characterization of fogging by organic compound of interior automotive materials and develop a semiautomated experimental prototype of a system for the acquisition and digital processing of images of droplets on glass substrates. We found optimal conditions of illumination of samples of fogging for the acquisition of images, achieving the resolution of 2 μm that is basically the limitation of the microscope used in the experiment. The list of parameters that characterize fogging was extended; in addition to size, we measure the shape, orientation, and distribution of droplets over the substrate. The shape of droplets on a substrate is given by equivalent ellipses. The following processes of the fogging characterization were automated: substrate positioning and image sampling at points selected randomly or on a regular lattice; acquisition, storage, and binarization of digital images; histograms of shape features, orientation, size, and deposition density of drops. As an example, we report the statistical analysis of drops of organic compounds. Two methods for the shape description of drops are evaluated and compared also.