Detection of Internal Quality in Seedless Watermelon by Acoustic Impulse Response
B. Diezma-Iglesias, M. Ruiz-Altisent and P. Barreiro
Biosystems Engineering Volume 88, Issue 2 , June 2004, Pages 221-230
2004
บทคัดย่อ
Recent commercialisation of seedless watermelon varieties relies on the guarantee of a high quality product. Several internal defects may deteriorate greatly this fruit:(a) creases and/or large voids in the flesh, (b) overripeness and (c) bruises due to impact. The objective of this research was to develop a feasiblenon-destructiveprocedure for detecting these defects in individualfruits,based on acoustic impulse response.
A device consisting of a microphone, structural elements and a mechanical impact generator was designed and tested. Good and defective seedless watermelons were tested with the acoustic device. Spectral parameters were examined as potentialnon-destructivepredictors of internal disorders. Waveband magnitude parameters, obtained by summing the magnitude of the spectrum between two frequencies in a specified band width (always including between 40 and 500 Hz), were the acoustic parameters showing the best ability to detect internal disorders.