Fig. 3
From: Epidermal Differential Impedance Sensor for Conformal Skin Hydration Monitoring
Soft, releasable connectors provide interfaces between epidermal, differential hydration sensors and external data acquisition hardware. Images of a representative connector that uses a serpentine layout and a thin silicone substrate, in an a underformed configuration, and in states of uniaxial deformation parallel b and perpendicular c to its long dimension. The spacings of the traces match those of the bonding pads at the edge of the hydration sensor. The compliant, stretchable nature of the connector and the sensor allows reversible electrical contact between the two by physical lamination d. e Image of data acquisition hardware: an impedance analyzer, an I/O controller, a custom package of data capture software with graphical user interface, and an ACF cable between a printed circuit board and the releasable connector