Lori Adornato, Eric A. Kaltenbacher, Robert H. Byrne, Xuewu Liu, and Regina Easley “High-resolution chemical sensor for unattended underwater networks”, Proc. SPIE 7112, Unmanned/Unattended Sensors and Sensor Networks V, 71120R (16 October 2008); https://doi.org/10.1117/12.802616
Autonomous underwater sensors are the best solution for continuous detection of chemical species in aquatic systems. The Spectrophotometric Elemental Analysis System (SEAS), an in situ instrument that incorporates both fluorescence and colorimetric techniques, provides high-resolution time-series measurements of a wide variety of analytes. The use of Teflon AF2400 long-pathlength optical cells allows for sub-parts-per-billion detection limits. User-defined sampling frequencies up to 1 Hz facilitate measurements of chemical concentrations on highly resolved temporal and spatial scales. Due to its modular construction, SEAS can be adapted for operation in littoral or open ocean regions. We present a high-level overview of the instrument’s design along with data from moored deployments and deep water casts.