การตรวจสอบสิ่งปลอมปนในน้ำยางจากค่าสภาพยอมไฟฟ้าเชิงซ้อน

Abstract

This thesis proposes a mathematical model for detecting contaminated latex using complex permittivity. The pure serum samples were prepared by centrifuging field fresh latex samples while the contaminated samples were prepared by adding certain amount of cassava and CaCo, into the pure samples. Complex permittivity measurements in frequencies range 0.5-6 GHz at 25 °C were performed with Agilent 8510E dielectric probe kit equipped with an automatic network analyzer. From the measured complex permittivity of pure and contaminated serum samples at 1 GHz, their conductivity, static permittivity, high-frequency permittivity, and relaxation time can be calculated. These parameters are crucial for formulating a mathematical model for the pure and the contaminated samples which can be used for developing an algorithm to classify pure and contaminated samples. The model for detecting pure and contaminated samples was tested with complex permittivity of latex. The model achieve 92% of accuracy for detecting.