Ms. Julie A. LaComb Profile

Julie A. LaComb

Engineer at Naval Undersea Warfare Ctr

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Proceedings Article | 20 April 2010 Paper

Electro-active material (EAM) based bend sensors

Ronald LaComb, Julie LaComb

Proceedings Volume 7678, 76780T (2010) https://doi.org/10.1117/12.848061

KEYWORDS: Sensors, Polymers, Epoxies, Polymeric sensors, Carbon, Metals, Electrodes, Composites, Resistance, Actuators

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The capability to accurately estimate strain and orientation of cables in an undersea environment is important for a multitude of applications. One way to estimate the positional location of a submersed cable is to utilize a network of distributed bend sensors providing inputs to a curve fitting algorithm. In this work commercially available bend sensors are characterized for small deflections. In addition proto-type devices are presented which can potentially improve device sensitivity. Commercially available bend sensors are based upon electro-active materials and variable resistance materials. Electro-active materials (EAM) are known for their actuator functionality but certain EAMs are capable of sensing as well. New advances in materials such as Ionic Polymer Metal Composites (IPMC) are proving suitable for quasi-static sensor applications. These sensors are low power, conformal and produce directionally dependent output voltages which are linearly proportional to deflection, with voltage polarity representative of the deflection direction. IPMCs are capable of being morphed for increased sensitivity. Variable resistivity sensors are based on smart epoxy polymer and carbon loaded inks. These sensors are inexpensive and conformal and unlike EAMs provide static measurements.

Proceedings Article | 2 May 2006 Paper

Ultra-wide band ground wave communication for a distributed sensor network

Julie LaComb, Paul Mileski

Proceedings Volume 6231, 62310F (2006) https://doi.org/10.1117/12.673006

KEYWORDS: Sensors, Antennas, Telecommunications, Satellite communications, Satellites, Receivers, Sensor networks, Transmitters, Relays, Modulation

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Ultra-wide band (UWB) ground wave (GW) is a novel means of communications for use with distributed networked sensors at sea. Although multiple distributed sensor systems are in development, the communications method for these systems has yet to be fully realized. The buoys that relay the sensor information have several key features: they must be small enough so they are not highly noticeable and do not pose a navigation hazard; they must be cheap enough to be expendable; they must be able to run on limited battery power; the communications link must be at a great enough distance so that fewer buoys are needed; and they must deal with multipath from the sea surface. Ultra-wide band ground wave will address many of these issues. UWB is being developed commercially at 3-10 GHz. UWB requires low power and the transmitters are extremely easy to implement making the system inexpensive and small. UWB provides low probability of detection and interception. However commercial UWB operates at very short distances. Implementing UWB Ground Wave instead of commercial-band UWB will extend the communication range between buoys up to 10 miles. The distributed sensors will transmit to a central buoy for data relay via satellite or communicate directly to a submarine, UUV or surface ship antenna. This project is currently being funded by Office of Naval Research (ONR) 313. The project commenced in October 2005.

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