Development of Foreign Material Detection in Food Sensor Using Electrical Resistance Technique
Nur Farah Intan Suhaila Rizalman, Wan Norhisyam Abd Rashid, Nurhanis Lokmanulhakim, Elmy Johana Mohamad · International Journal of Integrated Engineering · 2019
Electrical Resistance Sensor (ERS) is used as a novel concept of detection of foreign material in food.Resistance idea itself is the measure of opposition to electric current.At the point when an electric current of one ampere passes through a component across which a potential difference voltage of one volt exists, then the resistance of that component is one ohm.The only law that applied to this concept is Ohm's Law.It states that the current is directly proportional to the voltage and inversely proportional to the resistance.For that reason, the measure of voltage is equal to the measure of current multiplied by the measure of resistance, V=IR [1].Electrical resistance is the easiest electrical property to be measured accurately over a wide range at moderate cost.There are many classifications of resistive sensors based on their sensing principle but this project focused on using Abstract: Food inspection has been a serious matter in the food industry as the contamination by foreign materials such as metals, bone, plastics and glass in food plays a major impact on the industry.In spite of a great deal of effort to prevent mixing foreign bodies in food materials, food manufacturers have still not been able to detect them.Electrical Resistance Sensor to detect the foreign material in food detection sensor is constructed and presented in this work.This project focuses on how to design and implement the system to detect and distinguish between food and foreign material using resistance concept.The electrode plate of Electrical Resistance Sensor (ERS) is designed using COMSOL Multiphysics Software to see the electric field and contour of the electric potential of the system.The resistance value from the sensor is measured based on the AC Circuit concept.The alternating current from the sensor flows to the charge detector circuit providing the voltage corresponding to the resistance between the electrode pair.The voltage from the charge detector circuit has been amplified by the amplifier circuit to obtained DC output from an AC input signal.The voltage form circuit has been converted from the analog to digital signal using Bluetooth Electronics Application via Arduino Uno through HC-05 Bluetooth module.The Bluetooth Electronics Application is used as a graphical user interface (GUI) to display the condition of the material tested including food and foreign material to a smartphone.The experiment results show that the electrical resistance sensor are able to detect the foreign material in food by changes of the resistance value.If the food was detected with the foreign material (non-conductive), the value of resistance will decrease due to the flow of electric current.