Abstract
With the improvement of living standards, people are more concerned about the quality of edible oil. Compared with ordinary edible oil, recycled cooking oil contains heavy metal elements and other impurities. It means that recycled cooking oil’s conductivity is much higher than ordinary cooking oil. According to this feature, system of heavy metals detection and quality analysis based on conductivity of recycled cooking oil have been developed. Taking MCU as the core, this system has achieved functions of conductivity information acquisition, signal processing and human-computer interaction. Adopting bipolar pulse as excitation power supply, the system is aimed at weakening the capacitance effect and polarization effect effectively. Temperature compensation circuit is designed in order to reduce the influence of temperature change on the conductivity measurement. The experimental results show that the detection system has good effects on testing recycled oil which contains different heavy metal components. This detection system has a certain application and promotion value with advantages of low cost, high reliability, high accuracy.
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