Citation:
GONG Ying-Zhong, GUAN Liang, FENG Xin-Lu, WANG Li-Guang, LIU Han-Cheng, ZHU Li-Ye. Research on Two-channel and Differential Impedance Spectroscopy Measurement Technology and Instrument[J]. Chinese Journal of Analytical Chemistry,
;2016, 44(1): 160-166.
doi:
10.11895/j.issn.0253-3820.150546
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Dielectric difference analysis is important for impedance spectroscopy, which is the basis of dielectric materials composition, structure and performance characteristics analysis. As for normal single channel impedance spectroscopy measurement technique, substrate signals resulting from sensor substrate and so on will weaken the dielectric difference dramatically. In this work, a new impedance spectroscopic technique has been proposed, which is characterized by two-channel and differential detection methods and based on AD5933 impedance converter chip. In the frequency range of 1-91 kHz, experiments have been performed with the excitation signal differences from 0 mV to 100 mV under the substrate signal of 200, 400 and 1000 mV for new two-channel and differential and normal single channel impedance spectroscopic methods. Seven oil samples including gasoline, diesel fuel, jet fuel and lubricating oils have also been tested by the methods of single channel detection, differential detection with the references of air and jet fuel under the excitation voltage of 18 Vpp. The results showed that the impedance response sensitivity of two-channel and differential detection was 1-2 orders of magnitude of the normal single channel detection and free from the influence of substrate signal. For the oil samples, the impedance response sensitivity of differential detection with reference by jet fuel was 5-10 times of differential detection reference by air and 9-12 times of single channel detection, respectively, which proved that the differential detection could improve impedance detection sensitivity and eliminate the effect of substrate signal significantly.
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