Dr. David L. Huestis Profile

Dr. David L. Huestis

Associate Director at SRI International

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Publications (5)

Proceedings Article | 5 May 2010 Paper

Laser-based standoff detection of surface-bound explosive chemicals

David Huestis, Gregory Smith, Harald Oser

Proceedings Volume 7679, 76790G (2010) https://doi.org/10.1117/12.849769

KEYWORDS: Explosives, Ultraviolet radiation, Standoff detection, Laser induced fluorescence, NOx, Fourier transforms, Chemical analysis, Raman spectroscopy, Improvised explosive devices, Absorption

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Proceedings Article | 18 August 2003 Paper

Smart Pebble: wireless sensors for structural health monitoring of bridge decks

David Watters, Palitha Jayaweera, Alfred Bahr, David Huestis, Namal Priyantha, Robert Meline, Robert Reis, Douglas Parks

Proceedings Volume 5057, (2003) https://doi.org/10.1117/12.482397

KEYWORDS: Sensors, Electrodes, Bridges, Ions, Calibration, Amplifiers, Cements, Structural health monitoring, Electronics, Chlorine

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Proceedings Article | 28 July 2003 Paper

Shape control of large lightweight mirrors with dielectric elastomer actuation

Roy Kornbluh, David Flamm, Harsha Prahlad, Karen Nashold, Surjit Chhokar, Ron Pelrine, David Huestis, Jeffrey Simons, Thomas Cooper, David Watters

Proceedings Volume 5051, (2003) https://doi.org/10.1117/12.484405

KEYWORDS: Mirrors, Dielectrics, Actuators, Silicon, Polymers, Electrodes, Dielectric elastomer actuators, Shape analysis, Polymer thin films, Space telescopes

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Space-based astronomy and remote sensing systems would benefit from extremely large aperture mirrors that can permit greater-resolution images. To be cost effective and practical, such optical systems must be lightweight and capable of deployment from highly compacted stowed configurations. Such gossamer mirror structures are likely to be very flexible and therefore present challenges in achieving and maintaining the required optically precise shape. Active control based on dielectric elastomers was evaluated in order to address these challenges. Dielectric elastomers offer potential advantages over other candidate actuation technologies including high elastic strain, low power dissipation, tolerance of the space environment, and ease of commercial fabrication into large sheets. The basic functional element of dielectric elastomer actuation is a thin polymer film coated on both sides by a compliant electrode material. When voltage is applied between electrodes, a compressive force squeezes the film, causing it to expand in area. We have explored both material survivability issues and candidate designs of adaptive structures that incorporate dielectric elastomer actuation. Experimental testing has shown the operation of silicone-based actuator layers over a temperature range of -100 °C to 260 °C, suitable for most earth orbits. Analytical (finite element) and experimental methods suggested that dielectric elastomers can produce the necessary shape change when laminated to the back of a flexible mirror or incorporated into an inflatable mirror. Interferometric measurements verified the ability to effect controllable shape changes less than the wavelength of light. In an alternative design, discrete polymer actuators were shown to be able to control the position of a rigid mirror segment with a sensitivity of 1800 nm/V, suggesting that sub-wavelength position control is feasible. While initial results are promising, numerous technical challenges remain to be addressed, including the development of shape control algorithms, the fabrication of optically smooth reflective coatings, consideration of dynamic effects such as vibration, methods of addressing large-numbers of active areas, and stowability and deployment schemes.

Proceedings Article | 24 July 2001 Paper

Wireless subsurface microsensors for health monitoring of thermal protection systems on hypersonic vehicles

Frank Milos, David Watters, Joan Pallix, Alfred Bahr, David Huestis

Proceedings Volume 4335, (2001) https://doi.org/10.1117/12.434159

KEYWORDS: Sensors, Inspection, Reliability, Prototyping, Nondestructive evaluation, Data acquisition, Capacitors, Environmental sensing, Polymers, Microsensors

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Proceedings Article | 1 April 1992 Paper

Random-access stimulated-echo optical cache memory

Ravinder Kachru, Yu Bai, Xiao Shen, David Huestis

Proceedings Volume 1662, (1992) https://doi.org/10.1117/12.58504

KEYWORDS: Crystals, Data storage, Bragg cells, Absorption, Modulation, Fourier transforms, Pulsed laser operation, Ions, Image storage, Chemical species

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