Biomathematical analysis on impedance measurement during COVID-19 pandemic
Bin Zhao, Xia Jiang,
School of Science, Hubei University of Technology, Wuhan, Hubei, China.
Hospital, Hubei University of Technology, Wuhan, Hubei, China.
Correspondng Author: Bin Zhao
Citation: Bin Zhao, Xia Jiang, (2022). Biomathematical analysis on impedance measurement during COVID-19 pandemic. Research of Gastric Management and Hepatology. 1(1). DOI:10.58489/2836-6204/003
In the industrial field, impedance is an important parameter, and the measurement and analysis of impedance helps us to understand the changes of morphological characteristics of the object under test [1]. For example, in the oil and gas pipeline transmission system, the impedance of the pipeline corrosion protection layer needs to be measured to grasp its service life [2]; in the field of biomedicine, the clinical
application of bioimpedance technology has a great front [3]; in the field of corrosion monitoring, the monitoring of aircraft coatings, which is an effective means to prevent corrosion of the base metal [4], these belong to the category of high impedance measurement, with an impedance of up to 108Ω. Therefore, in the processing of these weak signals processing, the idea of sinusoidal fitting is used to process to obtain more information during COVID-19 pandemic.
1 Differential amplifier circuit mathematical model
The excitation signal is formed by bucking the sine signal generated by filtering, assuming that the bucking scale factor is
2 Understanding of sine fitting
Simple moving average method
First, we use the simple moving average method to feel the meaning of "moving".
There is a sequence as follows
Table.1.Sequence table
Sequence
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Value
3
5
3
7
7
10
9
6
8
5
2
1
3
6
7
If a moving average with a window of 5 is used, the element with a sequence of 11 and a value of 2 should be replaced with
3. Results
In large impedance measurements, the signal is extremely weak, so a differential circuit is introduced to change it into complex impedance form, and the simplicity of sine fitting in amplitude and phase calculation is used to assist in calculating the impedance magnitude, which plays an important role in subsequent large impedance measurements.
Conflict of interest
We have no conflict of interests to disclose and the manuscript has been read and approved by all named authors.
Acknowledgments
This work was supported by the Philosophical and Social Sciences Research Project of Hubei Education Department (19Y049), and the Staring Research Foundation for the Ph.D. of Hubei University of Technology (BSQD2019054), Hubei Province, China.
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