Research on apple impedance monitoring system under low frequency current-source
Jiang Gu-chuan · Journal of Hefei University of Technology · 2010
This paper introduces the principle of operation,hardware and software designs of the biology's impedance measuring system in which the apple is taken as the object.In the experimental hardware system design,pre-amplification and the middle filtering of the signals are considered,then the the signals are displayed,analyzed and processed on the digital storage oscilloscope,,and finally electrical signals are transmitted into the computer through the USB connection line and stored there.research into the impedance value of apples is conducted according to the biological impedance principle.The result proves the electrical impedance information of biological tissue gradually reduces along with increasing of the stimulation of frequency.Red Fuji apples are taken as an example.After they are separately laid aside for two days,10 days and one month,the impedance value increases as time goes by,which reflects the relation between fruit freshness and its impedance.This conclusion provides reference value and the theoretic basis for on-line examination of fruit′s quality to some degree.