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A fast method to estimate body capacitance to ground at mid frequencies Cover

A fast method to estimate body capacitance to ground at mid frequencies

Open Access
|Dec 2015

Figures & Tables

Fig.1

Equivalent circuit for impedance measurements based on an auto-balancing bridge.
Equivalent circuit for impedance measurements based on an auto-balancing bridge.

Fig.2

Equivalent circuit when a capacitor C is connected in series with each electrode in bipolar body impedance measurements.
Equivalent circuit when a capacitor C is connected in series with each electrode in bipolar body impedance measurements.

Fig.3

Simplified equivalent circuit when C is small enough for its impedance to predominate over that of the electrodes and the body at the measurement frequency.
Simplified equivalent circuit when C is small enough for its impedance to predominate over that of the electrodes and the body at the measurement frequency.

Capacitance CHL measured with the 4294A impedance analyzer and calculated body capacitance to ground Cg for the four subjects and two feet heights above to ground: 10 cm (u) and direct outsole contact (d)_

SubjectCHLu (pF)Cgu (pF)CHLd (pF)Cgd (pF)
122.595.418.2153.0
223.585.117.8159.7
324.872.920.5119.2
425.566.820.2123.2

Data from the measured subjects_ BMI is the body mass index (kg/m2)_

SubjectHeight (m)Weight (kg)BMIShoes’ outsole and type
11.9013036Rubber, sports shoes
21.809028Leather dress shoes
31.666524Rubber, boots with 4 cm heel
41.504219Leather, boot with 7 cm heel

Capacitance CHL measured with the MT4080 LCR meter and calculated body capacitance to ground Cg for the four subjects and two feet heights above ground: 10 cm (u) and direct outsole contact (d)_

SubjectCHLu (pF)Cgu (pF)CHLd (pF)Cgd (pF)
122.496.518.0156.3
223.486.117.8159.7
325.071.120.2123.2
425.864.319.8128.6
DOI: https://doi.org/10.5617/jeb.2569 | Journal eISSN: 1891-5469
Language: English
Page range: 33 - 36
Submitted on: Nov 28, 2015
Published on: Dec 18, 2015
Published by: University of Oslo
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year

© 2015 Carles Aliau-Bonet, Ramon Pallas-Areny, published by University of Oslo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.