Mr. Gregory G. Hahn Profile

Gregory G. Hahn

Graduate Assistant

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Proceedings Article | 15 April 2016 Paper

Experimental validation of a sub-surface model of solar power for distributed marine sensor systems

Gregory Hahn, Heather Cantin, Michael Shafer

Proceedings Volume 9799, 97993S (2016) https://doi.org/10.1117/12.2219438

KEYWORDS: Solar energy, Oceanography, Energy harvesting, Animal model studies, Coastal modeling, Solar cells, Data modeling, Sensors, Water, Phase modulation

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The capabilities of distributed sensor systems such as marine wildlife telemetry tags could be significantly enhanced through the integration of photovoltaic modules. Photovoltaic cells could be used to supplement the primary batteries for wildlife telemetry tags to allow for extended tag deployments, wherein larger amounts of data could be collected and transmitted in near real time. In this article, we present experimental results used to validate and improve key aspects of our original model for sub-surface solar power. We discuss the test methods and results, comparing analytic predictions to experimental results. In a previous work, we introduced a model for sub-surface solar power that used analytic models and empirical data to predict the solar irradiance available for harvest at any depth under the ocean's surface over the course of a year. This model presented underwater photovoltaic transduction as a viable means of supplementing energy for marine wildlife telemetry tags. The additional data provided by improvements in daily energy budgets would enhance the temporal and spatial comprehension of the host's activities and/or environments. Photovoltaic transduction is one method that has not been widely deployed in the sub-surface marine environments despite widespread use on terrestrial and avian species wildlife tag systems. Until now, the use of photovoltaic cells for underwater energy harvesting has generally been disregarded as a viable energy source in this arena. In addition to marine telemetry systems, photovoltaic energy harvesting systems could also serve as a means of energy supply for autonomous underwater vehicles (AUVs), as well as submersible buoys for oceanographic data collection.

Proceedings Article | 2 April 2015 Paper

A hydrostatic pressure-cycle energy harvester

Michael Shafer, Gregory Hahn, Eric Morgan

Proceedings Volume 9431, 94310F (2015) https://doi.org/10.1117/12.2084279

KEYWORDS: Energy harvesting, Oceanography, Solar energy, Water, Sensors, Transducers, Satellites, Electronics, Data acquisition, Hydroelectric energy

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There have been a number of new applications for energy harvesting with the ever-decreasing power consumption of microelectronic devices. In this paper we explore a new area of marine animal energy harvesting for use in powering tags known as bio-loggers. These devices record data about the animal or its surroundings, but have always had limited deployment times due to battery depletion. Reduced solar irradiance below the water's surface provides the impetus to explore other energy harvesting concepts beyond solar power for use on marine animals. We review existing tag technologies in relation to this application, specifically relating to energy consumption. Additionally, we propose a new idea for energy harvesting, using hydrostatic pressure changes as a source for energy production. We present initial testing results of a bench-top model and show that the daily energy harvesting potential from this technology can meet or exceed that consumed by current marine bio-logging tags. The application of this concept in the arena of bio-logging technology could substantially increase bio-logger deployment lifetimes, allowing for longitudinal studies over the course of multiple breeding and/or migration cycles.

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