November 10th, 2008
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Abstract This paper introduces a novel ESPRIT-based closed form source localization algorithm applicable to arbitrarily spaced three-dimensional arrays of vector hydrophones, whose locations need not be known. Each vector hydrophone consists of two or three identical but orthogonally oriented velocity hydrophones plus one pressure hydrophone, all spatially co-located in a point-like geometry. A velocity hydrophone [...]
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Abstract A new type of PVDF hydrophone, the multilayer planar PVDF hydrophone, is described in this paper. The hydrophone disturbs measured acoustic fields very little and has a high sensitivity. The noise equivalent pressure of the hydrophone is 45 dB re 1 μ Pa per Hz bandwidth.The working freqency range og hyrophon is 20kHz ~4MHz.In [...]
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Abstract The design of a new wideband, quantitative shock wave hydrophone is presented. The sensor not only has a wideband (>SOMHz) and linear (up to 100MPa) response, but it also operates in a measurement environment in which the hydrophone element’s sensitivity changes as a function of shock wave exposure. Thin films of polyvinylidene difluoride (PVDF) [...]
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Abstract Wireless sensor nodes are autonomous devices incorporating sensing, power, computation, and communication into one system. Applications for large scale networks of these nodes are presented in the context of their impact on the hardware design. The demand for low unit cost and multiyear lifetimes, combined with progress in CMOS and MEMS processing, are driving [...]
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Abstract Smart Dust particles are small smart materials used for generating weather maps. We investigate the open problem posed by Vidal et al. on the optimal number of Smart Dust particles necessary for constructing,precise.,cost effective and accurate 3-D weather map. Keywords: Smart structures,matching ,optimization Download Share and Enjoy:
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Abstract Smart dust has been conceived as millimeter scale autonomous systems that form the basis for massively distributed wireless sensor networks[ 1, 21. Smart dust motes have been demonstrated that pack sensors, interfaces, power sources, digital control communications and processing circuitry into a few cubic millimeters volume. Previously, both the delivery of a mote swarm [...]
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Abstract THE NAME STARTED OUT AS SOMETHING OF A JOKE. “EVERYONE WAS TALKING ABOUT SMART HOUSES, SMART BUILDINGS, SMART BOMBS, AND I THOUGHT THAT IT WAS funny to talk about smart dust,” remembers Kris Pister. Though he might have named his invention partly in jest, “smart dust” is now part of the technical lexicon. The [...]
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Abstract Smart Dust is a set of a vast number of ultra-small fully autonomous computing and communication devices, with very restricted energy and computing capabilities, that co-operate to quickly and efficiently accomplish a large sensing task. Smart Dust can be very useful in practice i.e. in the local detection of a remote crucial event and [...]
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Abstract We have demonstrated a 138mm3 autonomous uni-directional sensing/communication mote that optically transmits a measure of the ambient light level. We have also developed a 6 3 m 3 autonomous bi-directional communication mote that receives an optical signal, generates a pseudorandom sequence based on this signal to emulate sensor data, then optically transmits the result, [...]
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Abstract Decreasing computing device size, increased connectivity, and enhanced interaction with the physical world have characterized computing’s history. Recently, the popularity of small computing devices, such as handheld computers and cell phones, burgeoning Internet growth, and the diminishing size and cost of sensors— especially transistors—have accelerated these trends. The emergence of small computing elements, with [...]
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Abstract In this paper we present a miniature systcm that is being designed for the Smart Dust project to test the communication link and simulate basic functionality. The system includes an optical receiver to process the incoming laser signal, digital circuits to gcnerate a pseudorandom number sequencc, a corner cube reflector (CCR) to passively transmit [...]
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Abstract In this paper, we attempt to develop a reliable speaker verification algorithm that is suitable for use in a home security system. A phoneme-based Hidden Markov Model(HMM) has been adopted for the task of speaker verification with the linear predictive cepstral coefficients (LPCC) as feature vectors for our model. Individual codebooks, designed to enhance [...]
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