The Use of an Inductive Coil System for the Description of Damages in Apple Tissue with Electrical Parameters

The main objective of this work was to determine if it is possible to distinguish between intact and destroyed apple tissue with an inductively working coil system. With conductive measurement, it is possible to measure the amount of destroyed cell in plant tissues. Destroyed cells in plant tissue can mean bad quality for the particular product. The advantage of the inductive measuring technique is the possibility to measure the complete product contactless and non-destructively during the production process. Hence, an inline measurement system could be developed.In order to destroy cells in apples, a freeze-thaw cycle was subjected to three different apples varieties (Braeburn, Jonagold and Idared). The changes of the electrical parameters were observed before and after the thermal treatment.It could be demonstrated that the inductive measuring leads to similar statements as conductive measuring methods. The electrical parameters showed mass dependent. Hence, the electrical parameters had to be normalized to the sample mass. The mass normalized voltage UB,normalized is well suited to describe the cell destruction. It could be shown that the cell destruction provides higher UB,normalized-values.

Inductive Sensor for Weighing of Mass

Inductive Sensor for Weighing of Mass A new method measuring of mass in electronic system of scales has been described. The main element of this system is inductive measuring load cell, which was compared with strain gauge load cell. The aim of the paper is described advantages of the inductive measuring system of mass and explain some main problems of this system. Digital correction of the mechanical errors of the beam like: hysteresis, creep material of the beam under constant load, influence of ambient temperature was described.