Recent years have seen a rise in sensor systems described as "flexible" or "stretchable," often realized as foil-based designs that conform to complex shapes without compromising functionality or movement. This thesis presents a foil-based stretchable 6 x 6 sensor array patch with a sensing area of approximately 30 x 30 mm, capable of measuring local bending deformation at 36 points through integrated sensors. To enhance bending sensitivity and reduce the sensor response to foil stretching, a double-sided design with strain gauges on both sides of a thin polyimide foil is introduced. The primary application focuses on respiratory monitoring for premature infants, with the patch placed on the skin between the chest and abdomen to detect oscillating deformations from breathing. This data aims to trigger an artificial respiration device and facilitate body surface reconstruction, serving as an extended diagnostic tool. Experiments using a mechanical setup mimicking breathing demonstrated that specially developed algorithms could identify trigger points with a delay of less than 80 ms (± 22 ms) relative to the ventilation pressure stimulus peak, resuming detection within 2-3 seconds after external disturbances. Additionally, algorithms for surface reconstruction achieved an almost perfect correlation between forced foil deformation and the reconstructed shape when bending around one axis.
