Impedance-matched impedance spectroscopy measuring system and method
A technology of impedance matching and measurement system, which is applied in measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., and can solve problems such as low measurement accuracy, small measurement range, and reduced measurement accuracy
Active Publication Date: 2018-06-29
HUBEI UNIV OF TECH
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[0005] In short, the conventional impedance spectroscopy measurement method does not consider the impedance matching in the measurement process, either the measurement accuracy is low, or the measurement range is small, or manual shifting is required; , requires data processing of the whole cycle, which is not suitable for the situation where the number of high-frequency sampling points is small; finally, the measurement system impedance is not distinguished from the measured impedance during the measurement process, which reduces the measurement accuracy
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[0059] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit this invention.
[0060] please see Figure 1-Figure 3 , the technical solution adopted by the system of the present invention is: an impedance matching impedance spectroscopy measurement system, characterized in that it includes: an emitter follower module, a DC suppression module, a multi-channel resistance pair module, an impedance module, and a differential amplification module , central processing unit; the described emitter follower module is connected with the described DC suppression module through wires; the described DC suppression module is connected with the descri...
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The invention relates to an impedance-matched impedance spectroscopy measuring system and method. The method comprises the following steps: firstly generating a sinusoidal signal through a central processing unit according to a DDS algorithm; and selecting different resistances through a resistance pair module, and respectively collecting a system proportion amplification coefficient under the conditions of an impedance turn-off module and an impedance turn-on module; calculating a measurement impedance value according to a linear least square fitting algorithm; finally selecting the matched impedances to the different frequencies of the sinusoidal signals through an artificial selection method so as to obtain a matched impedance spectroscopy. Compared with the prior art, the method is capable of overcoming a problem that the measurement accuracy is reduced because the impedance is not matched in the impedance spectroscopy measurement, and further improving the precision of the measuring system.
Description
technical field [0001] The present invention relates to the field of measurement circuit technology and signal processing technology, in particular to an impedance matching impedance spectrum measurement system and method. Background technique [0002] In the research process of electrochemical performance, the method of measuring electrochemical impedance spectroscopy is often used. Electrochemical impedance spectroscopy is an electrochemical measurement method that uses a small-amplitude sine wave current as a disturbance signal. Since the electrochemical system is perturbed by a small-amplitude electrical signal, on the one hand, it can avoid a large impact on the system, and on the other hand, the relationship between the disturbance and the response of the system is approximately linear, which makes the mathematical processing of the measurement results made easy. At the same time, the electrochemical impedance spectroscopy method is a measurement method in the freque...
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IPC IPC(8): G01R27/02G01N27/26
CPCG01N27/26G01R27/02
Inventor王选择方诗雪洪潭翟中生杨练根周向东
OwnerHUBEI UNIV OF TECH