1989 Volume 51 Issue 5 Pages 55-61
It is necessary that the shape, size and electrical properties of peels of fruits have very litte effect on the inspection results for the practical application of the nondestructive electrical inspection of the internal quality of fruits and vegetables.
To investigate the influence of peels in nondestructive measurement, we measured the electrical properties of peeled fruits (whole sarcocarps), and compared with those of whole fruits. Our experiments revealed that, although at lower measuring frequencies the impedance of peels is so high that their influence is too large, at higher frequency over 1MHz, the differences between electrical properties of peels and those of sarcocarps are reduced to such low levels that the influence of peels is small.
Next, we tried to calculate the impedance of sarcocarps from the impedance of the layer near the surface and the impedance of whole fruit. The calculated values of sarcocarps by this nondestructive correction method agree well with the values of sarcocarps measured after removing peels.
