README File For ‘Dataset supporting ”A comparative evaluation of
equivalent circuit and finite element electrical skin modelling
techniques”’

Dataset DOI: https://doi.org/10.5258/SOTON/D2487

Created: Dec 2022

Authors: Tom Greig *, Kai Yang †, Russel Torah ‡
* tg8g16@soton.ac.uk https://orcid.org/0000-0003-2745-235X
† ky2e09@soton.ac.uk https://orcid.org/0000-0001-7497-3911
‡ rnt@ecs.soton.ac.uk https://orcid.org/0000-0002-5598-2860

License: CC-BY, I guess...

This dataset supports: A comparative evaluation of equivalent circuit
		and finite element electrical skin modelling techniques
	Authors: Tom Greig, Kai Yang, Russel Torah
	Journal: Biomedical physics and engineering express.
	DOI: https://doi.org/10.1088/2057-1976/acfb04

Contents:
.
├── README.txt - What you're looking at.
├── Makefile - Generates all the graphs from the R scripts and .csvs
├── analysis - R scripts for plotting graphs and such
│   ├── comparison.r - Plots the comparison of comsol and equiv. circuit
│   ├── comsol.r - Plot plain comsol results
│   ├── comsol_wobble.r - Plots wobbly comsol results
│   ├── copper.r - Derives parameters for electrodes on copper
│   ├── meter_error.r - Plots meter error graphs
│   ├── tissue.r - Derives parameters for electrodes on tissue
│   └── tissue_params.r - Plots tissue parameters.
├── data - Lots of csv files.
│   ├── comsol.csv - Exported output from `skin.mph'
│   ├── comsol_wobble.csv - Exported output  from `skin-wobbly.mph'
│   ├── copper
│   │   └── <electrode>-<weight>g-<w|d>-<n>.csv
│   │           Impedance data for <electrode> (a or b) under <weight>
│   │           grams of mass, `w'et or `d'ry, repeat <n>.
│   ├── meter_error - Measurements of known impedances
│   │   ├── 100-10n-100k.csv - 100Ω + ( 100kΩ || 1nF )
│   │   ├── 10k-1n.csv - 10kΩ || 1nF
│   │   └── 10k.csv - 10kΩ
│   └── tissue
│       ├── <dist>mm-<weight>g-<w|d>-<n>.csv
│       │       Impedance between electrodes on tissue, <dist>mm apart,
│       │       with <wight>g of mass, `w'et or `d'ry, repeat <n>.
│       └── README - Some details
├── skin.mph - Comsol model
└── skin-wobbly.mph - Wobbly Comsol model

5 directories, 146 files

R scripts tested with R 4.2.2, but should be pretty relaxed about what
version you're using.
Comsol models created with comsol 5.5.0.359 and it will scream blue
murder if you try to open them with a different version.

All the data from the impedance meter (data/*/*.csv) has three columns:
frequency / Hz, Impedance magnitude / Ω and Phase / °.

The columns in data/comsol.csv are electrode distance / m, muscle
thickness / m, hypodermis thickness / m, dermis thickness / m, epidermis
thickness / m, stratum corneum thickness / m, frequency / Hz and complex
impedance / Ω.

The columns in data/comsol_wobble.csv are wobbliness (see model or
paper for an explanation), frequency / Hz, complex impedance / Ω.
