Piezoresistive Foam Sensor Arrays for Marine Applications

TL;DR

This paper introduces a waterproof, flexible foam sensor array for marine flow measurement, offering high sensitivity, broad dynamic range, and low cost, inspired by fish lateral line sensing.

Contribution

Development of a novel waterproof, conformal foam sensor array for marine flow sensing with calibration and performance characterization.

Findings

Sensitivity around 5 Pascal

Dynamic range of 50-500 Pascal

Cost less than $10 per sensor

Abstract

Spatially-dense pressure measurements are needed on curved surfaces in marine environments to provide marine vehicles with the detailed, real-time measurements of the near-field flow necessary to improve performance through flow control. To address this challenge, a waterproof and conformal pressure sensor array comprising carbon black-doped-silicone closed-cell foam (CBPDMS foam) was developed for use in marine applications. The response of the CBPDMS foam sensor arrays was characterized using periodic hydrodynamic pressure stimuli from vertical plunging, from which a piecewise polynomial calibration was developed to describe the sensor response. Inspired by the distributed pressure and velocity sensing capabilities of the fish lateral line, the CBPDMS foam sensor arrays have significant advantages over existing commercial sensors for distributed flow reconstruction and control. Experimental results have shown the sensor arrays to have sensitivity on the order of 5 Pascal, dynamic range of 50-500 Pascal; are contained in a waterproof and completely flexible package, and have material cost less than $10 per sensor.