30.09.2021

Force measurement of electrodes on a human head model.

Automatic Segmentation of Skin Cells in Multiphoton Data using Multi-Stage Merging

Left: Schematic of the measurement setup with the drilling hole in the head model (left) and photo of the mechanical setup (right). 1 motor, 2 linear guide, 3 force sensor, 4 aluminium profile for mounting all components and 5 the head model surface with hole on the upper position. Right: Three measurements of the force displacement curves of the same TES-cap.

Electroencephalography (EEG) and transcranial electric stimulation (TES) require caps for holding the respective electrodes in place. To support the optimal design of such caps, knowledge of the force-displacement curves for each electrode position is desirable. We propose a calibrated setup to traceably measure force-displacement curves which consists of a human head model, a force sensor, a linear guide, a stepper motor, and a multiplexing multimeter. Repeated measures of a textile EEG-cap and a TES-cap show significant non-linearity and hysteresis effects for the force-displacement curves. Our setup will allow for the assessment of the fit of EEG and TES-caps for various head shapes and sizes.

Fröhlich, Thomas, Sindram, Johannes, Haueisen, Jens and Hunold, Alexander:

"Force measurement of electrodes on a human head model"
tm - Technisches Messen, 2021, pp. 000010151520210082.

https://doi.org/10.1515/teme-2021-0082

Contact:   Alexander Hunold, Prof. Dr.‐Ing. Jens Haueisen