Determination of Melting Point of Chemical Substances Using Image Differencing Method

Abstract

Melting point apparatus mainly used in pharmaceutical and chemical industries for determining melting point of chemical substances. Some melting point apparatus are based on manual process in which users have to keep continuously focus on capillary tube till melting point achieved. While some melting point apparatus are digitally or automatically operated and there is no need of operator’s attention. In this paper novel algorithm is proposed for melting point detection of any chemical substance. proposed algorithm is based on change detection technique, it computes pixel value differencing at particular coordinate of two consecutive frames generated by real time video. Difference is compared with threshold value, when pixel value difference crosses the threshold the temperature at that instant recorded as melting point of chemical substance, Proposed algorithm determined melting point of Sodium bicarbonate, D-glucose, Sodium Nitrate, Potassium nitrate and magnesium nitrate with maximum accuracy 98.8% for Potassium nitrate.