Performance analysis and characterization of bio-inspired whisker sensors for underwater applications

Pinnipeds (seals, sea lions, etc.) use their whiskers to find and track hydrodynamic trails left by potential prey. Our group recently developed new underwater sensors based on pinniped whiskers, which not only exploit their characteristic geometries but also the dynamics of whisker follicles to improve and tailor sensing capabilities. The sensors are simple, robust, and a straightforward methodology can be used to tailor their sensitivity to different target signals. A lumped parameter model is used to predict sensor performance. The model predictions for static scenarios are compared to experimental results for constant speed measurements. Scalings for static and dynamic measurement scenarios are also given. In both cases the sensors show a strong sensitivity to follicle material properties and whisker length. The results show the sensors can be used for flow sensing and are a promising feedback source for navigation based on near field hydrodynamic features.