Research on impedance detection device of glucose solution / 中国医学装备

ABSTRACT

Objective:To analyze the relationship between the concentration of glucose and the impedance of human blood, and study the relationship between human blood glucose detection and human blood impedance.Methods:The system adopts the AD5933 digital frequency synthesizer (DDS) in the excitation signal is produced, imposed on the impedance under test, the ADC acquisition signal and sent to the corresponding chip DFT digital processing module, measurement results through the I2C sent to the microcontroller, again by the single-chip microcomputer and PC computer communication, the computer shows that the impedance values. Results:The instrument can realize the resistor, capacitor, inductance, glucose solution impedance measuring rapidly and accurately, through experimental verify that resistive impedance deviation from the mean is 0.04, phase deviation from the mean is 0.15°.Conclusion:The glucose concentration of aqueous solution was linearly correlated with the impedance, the correlation coefficient greater than 0.99.