Low-SWaP-C colorimetric detection of vapor-phase chemical threats

Abstract

Colorimetric chemical sensors are some of the simplest and low-cost sensors available today. Advancements in small, chip-based optical readout packages, coupled with low-power electronics and wireless communications modules, have allowed for the development of a hands-free colorimetry-based chemical sensor that effectively acts as self-reading M8 paper that responds to vapor-phase chemical threats. We have designed a prototype that can be worn by the user and operate autonomously to provide individual-level chemical threat early notice. By integrating these sensors into a communications network, opportunities exist to create team-scale mesh chemical sensor networks. These prototypes have been tested against toxic industrial chemical (TIC) vapors in the lab and have undergone surety testing against select chemical agent threats. In an effort to extend the utility of these chemical sensors, we have recently started a new effort to integrate the sensor package into new form factors for new tasks. Examples of these include a throwable ball sensor for proximal remote point sensing (in the field or probing an enclosed space) and an unobtrusive sensor placed around a fixed site to monitor for upwind chemical releases.