The Experts below are selected from a list of 18873 Experts worldwide ranked by ideXlab platform
Motoichi Takahashi - One of the best experts on this subject based on the ideXlab platform.
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IEEE 802.11-Based Wireless Sensor System for Vibration Measurement
Advances in Civil Engineering, 2010Co-Authors: Yutaka Uchimura, Tadashi Nasu, Motoichi TakahashiAbstract:Network-based wireless sensing has become an important area of research and various new applications for remote sensing are expected to emerge. One of the promising applications is structural health monitoring of building or civil engineering structure and it often requires Vibration Measurement. For the Vibration Measurement via wireless network, time synchronization is indispensable. In this paper, we introduce a newly developed time synchronized wireless sensor network system. The system employs IEEE 802.11 standard-based TSF-counter and sends the measured data with the counter value. TSF based synchronization enables consistency on common clock among different wireless nodes. We consider the scale effect on synchronization accuracy and evaluated the effect by taking beacon collisions into account. The scalability issue by numerical simulations is also studied. This paper also introduces a newly developed wireless sensing system and the hardware and software specifications are introduced. The experiments were conducted in a reinforced concrete building to evaluate synchronization accuracy. The developed system was also applied for a Vibration Measurement of a 22-story steel structured high rise building. The experimental results showed that the system performed more than sufficiently.
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IEEE 802.11 timing synchronization based wireless sensor system for Vibration Measurement
2008 SICE Annual Conference, 2008Co-Authors: Yutaka Uchimura, Tadashi Nasu, Motoichi TakahashiAbstract:Network based wireless sensing has become an important area of research and various new applications for remote sensing are expected to emerge. One of the promising applications is structural health monitoring of building or civil engineering structure and it often requires Vibration Measurement. For the Vibration Measurement via wireless network, time synchronization is indispensable. In this paper, we introduce a newly developed time synchronized wireless sensor network system. The system employs IEEE 802.11 standard based TSF counter and sends the measured data with the counter value. TSF based synchronization enables consistency on common clock among different wireless nodes. We consider the scale effect on the synchronization accuracy and the effect is evaluated by stochastic analysis and simulation studies. A new wireless sensing system was developed and the hardware and software specifications are shown. The experiments were conducted in a reinforced concrete building and results showed that the system performed more than sufficiently.
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Time synchronized wireless sensor network for Vibration Measurement
SICE Annual Conference 2007, 2007Co-Authors: Yutaka Uchimura, Tadashi Nasu, Motoichi TakahashiAbstract:Network based wireless sensing has become an important area of research and various new applications for remote sensing are expected to emerge. One of the promising applications is structural health monitoring of building or civil engineering structure and it often requires Vibration Measurement. For the Vibration Measurement via wireless network, time synchronization is indispensable. In this paper, we introduce a newly developed time synchronized wireless sensor network system. The system employs IEEE 802.11 standard based TSF counter and sends the measured data with the counter value. It enables consistency on common clock among different wireless nodes. We describe the accuracy evaluation by simulation studies when the size of nodes increased. The hardware and software specifications of the developed wireless sensing system are shown. The experiments were conducted in a three-story reinforced concrete building and results showed the system performs more than sufficiently.
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Time synchronized wireless sensor network and its application to building Vibration Measurement
IECON 2007 - 33rd Annual Conference of the IEEE Industrial Electronics Society, 2007Co-Authors: Yutaka Uchimura, Tadashi Nasu, Motoichi TakahashiAbstract:Network based wireless sensing has become an important area of research and various new applications for remote sensing are expected to emerge. One of the promising applications is structural health monitoring of building or civil engineering structure and it often requires Vibration Measurement. For the Vibration Measurement via wireless network, time synchronization is indispensable. In this paper, we introduce a newly developed time synchronized wireless sensor network system. The system employs IEEE 802.11 standard based TSF counter and sends the measured data with the counter value. It enables consistency on common clock among different wireless nodes. We describe the accuracy evaluation by simulation studies when the size of nodes increased. The hardware and software specifications of the developed wireless sensing system are shown. The experiments were conducted in a three-story reinforced concrete building and results showed the system performs more than sufficiently.
Yutaka Uchimura - One of the best experts on this subject based on the ideXlab platform.
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IEEE 802.11-Based Wireless Sensor System for Vibration Measurement
Advances in Civil Engineering, 2010Co-Authors: Yutaka Uchimura, Tadashi Nasu, Motoichi TakahashiAbstract:Network-based wireless sensing has become an important area of research and various new applications for remote sensing are expected to emerge. One of the promising applications is structural health monitoring of building or civil engineering structure and it often requires Vibration Measurement. For the Vibration Measurement via wireless network, time synchronization is indispensable. In this paper, we introduce a newly developed time synchronized wireless sensor network system. The system employs IEEE 802.11 standard-based TSF-counter and sends the measured data with the counter value. TSF based synchronization enables consistency on common clock among different wireless nodes. We consider the scale effect on synchronization accuracy and evaluated the effect by taking beacon collisions into account. The scalability issue by numerical simulations is also studied. This paper also introduces a newly developed wireless sensing system and the hardware and software specifications are introduced. The experiments were conducted in a reinforced concrete building to evaluate synchronization accuracy. The developed system was also applied for a Vibration Measurement of a 22-story steel structured high rise building. The experimental results showed that the system performed more than sufficiently.
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Time synchronized wireless sensor system for building Vibration Measurement
2008 5th International Conference on Networked Sensing Systems, 2008Co-Authors: Yutaka UchimuraAbstract:Network based wireless sensing has become an important area of research and various new applications for remote sensing are expected to emerge. One of the promising applications is structural health monitoring of building or civil engineering structure and it often requires Vibration Measurement. For the Vibration Measurement via wireless network, time synchronization is indispensable. In this paper, we introduce a newly developed time synchronized wireless sensor network system. The system employs IEEE 802.11 standard based TSF counter and sends the measured data with the counter value. It enables consistency on common clock among different wireless nodes. We describe the accuracy evaluation by both mathematical analysis and simulation studies when the size of nodes increased. The hardware and software specifications of the developed wireless sensing system are shown. The experiments were conducted in a three-story reinforced concrete building and results showed the system performs more than sufficiently.
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IEEE 802.11 timing synchronization based wireless sensor system for Vibration Measurement
2008 SICE Annual Conference, 2008Co-Authors: Yutaka Uchimura, Tadashi Nasu, Motoichi TakahashiAbstract:Network based wireless sensing has become an important area of research and various new applications for remote sensing are expected to emerge. One of the promising applications is structural health monitoring of building or civil engineering structure and it often requires Vibration Measurement. For the Vibration Measurement via wireless network, time synchronization is indispensable. In this paper, we introduce a newly developed time synchronized wireless sensor network system. The system employs IEEE 802.11 standard based TSF counter and sends the measured data with the counter value. TSF based synchronization enables consistency on common clock among different wireless nodes. We consider the scale effect on the synchronization accuracy and the effect is evaluated by stochastic analysis and simulation studies. A new wireless sensing system was developed and the hardware and software specifications are shown. The experiments were conducted in a reinforced concrete building and results showed that the system performed more than sufficiently.
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Time synchronized wireless sensor network for Vibration Measurement
SICE Annual Conference 2007, 2007Co-Authors: Yutaka Uchimura, Tadashi Nasu, Motoichi TakahashiAbstract:Network based wireless sensing has become an important area of research and various new applications for remote sensing are expected to emerge. One of the promising applications is structural health monitoring of building or civil engineering structure and it often requires Vibration Measurement. For the Vibration Measurement via wireless network, time synchronization is indispensable. In this paper, we introduce a newly developed time synchronized wireless sensor network system. The system employs IEEE 802.11 standard based TSF counter and sends the measured data with the counter value. It enables consistency on common clock among different wireless nodes. We describe the accuracy evaluation by simulation studies when the size of nodes increased. The hardware and software specifications of the developed wireless sensing system are shown. The experiments were conducted in a three-story reinforced concrete building and results showed the system performs more than sufficiently.
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Time synchronized wireless sensor network and its application to building Vibration Measurement
IECON 2007 - 33rd Annual Conference of the IEEE Industrial Electronics Society, 2007Co-Authors: Yutaka Uchimura, Tadashi Nasu, Motoichi TakahashiAbstract:Network based wireless sensing has become an important area of research and various new applications for remote sensing are expected to emerge. One of the promising applications is structural health monitoring of building or civil engineering structure and it often requires Vibration Measurement. For the Vibration Measurement via wireless network, time synchronization is indispensable. In this paper, we introduce a newly developed time synchronized wireless sensor network system. The system employs IEEE 802.11 standard based TSF counter and sends the measured data with the counter value. It enables consistency on common clock among different wireless nodes. We describe the accuracy evaluation by simulation studies when the size of nodes increased. The hardware and software specifications of the developed wireless sensing system are shown. The experiments were conducted in a three-story reinforced concrete building and results showed the system performs more than sufficiently.
Hans J. Tiziani - One of the best experts on this subject based on the ideXlab platform.
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Time-resolved Vibration Measurement with temporal speckle pattern interferometry.
Applied optics, 2006Co-Authors: Jochen Kauffmann, Hans J. TizianiAbstract:Temporal speckle pattern interferometry (TSPI) is an optical Measurement procedurefor measuring the displacement of rough technical surfaces. The time-dependent speckle modulation due to optical path difference changes is tracked during the whole displacement of the surface and then evaluated pointwise without referring to neighboring pixels. This feature allows for its use as independent point sensors. This aspect of incremental phase tracking enables TSPI to be used to measure time-resolved mechanical Vibrations. It also reduces the deteriorating effect of the decorrelation. Therefore large displacements can be measured. A concept for an inexpensive fiber-optical point sensor was developed and the theoretical accuracy for Vibration Measurement was investigated. The TSPI Measurement of a loudspeaker membrane is compared with a high-precision vibrometer Measurement. The first results show good agreement.
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Temporal Speckle Pattern Interferometry for Vibration Measurement
Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 2002Co-Authors: Jochen Kauffmann, Hans J. TizianiAbstract:The evaluation of the time dependent speckle modulation [2-3] due to optical path difference changes can be extendedto Vibration Measurement. For a sinusoidal signal evaluation with varying frequency: from zero at its reversal point, tomaximum frequency at its medium position with maximum speed. For both cases we assume a harmonic Vibration. Forevaluation, the distance of two adjacent zero frequency points is determined, giving half the mechanical time base, andthe maximum frequency, giving the maximum mechanical speed, or, assuming a harmonic Vibration, the mechanicalamplitude.For a single point sensor very good results were obtained with a fast (40 Mhz) AID
Tadashi Nasu - One of the best experts on this subject based on the ideXlab platform.
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IEEE 802.11-Based Wireless Sensor System for Vibration Measurement
Advances in Civil Engineering, 2010Co-Authors: Yutaka Uchimura, Tadashi Nasu, Motoichi TakahashiAbstract:Network-based wireless sensing has become an important area of research and various new applications for remote sensing are expected to emerge. One of the promising applications is structural health monitoring of building or civil engineering structure and it often requires Vibration Measurement. For the Vibration Measurement via wireless network, time synchronization is indispensable. In this paper, we introduce a newly developed time synchronized wireless sensor network system. The system employs IEEE 802.11 standard-based TSF-counter and sends the measured data with the counter value. TSF based synchronization enables consistency on common clock among different wireless nodes. We consider the scale effect on synchronization accuracy and evaluated the effect by taking beacon collisions into account. The scalability issue by numerical simulations is also studied. This paper also introduces a newly developed wireless sensing system and the hardware and software specifications are introduced. The experiments were conducted in a reinforced concrete building to evaluate synchronization accuracy. The developed system was also applied for a Vibration Measurement of a 22-story steel structured high rise building. The experimental results showed that the system performed more than sufficiently.
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IEEE 802.11 timing synchronization based wireless sensor system for Vibration Measurement
2008 SICE Annual Conference, 2008Co-Authors: Yutaka Uchimura, Tadashi Nasu, Motoichi TakahashiAbstract:Network based wireless sensing has become an important area of research and various new applications for remote sensing are expected to emerge. One of the promising applications is structural health monitoring of building or civil engineering structure and it often requires Vibration Measurement. For the Vibration Measurement via wireless network, time synchronization is indispensable. In this paper, we introduce a newly developed time synchronized wireless sensor network system. The system employs IEEE 802.11 standard based TSF counter and sends the measured data with the counter value. TSF based synchronization enables consistency on common clock among different wireless nodes. We consider the scale effect on the synchronization accuracy and the effect is evaluated by stochastic analysis and simulation studies. A new wireless sensing system was developed and the hardware and software specifications are shown. The experiments were conducted in a reinforced concrete building and results showed that the system performed more than sufficiently.
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Time synchronized wireless sensor network for Vibration Measurement
SICE Annual Conference 2007, 2007Co-Authors: Yutaka Uchimura, Tadashi Nasu, Motoichi TakahashiAbstract:Network based wireless sensing has become an important area of research and various new applications for remote sensing are expected to emerge. One of the promising applications is structural health monitoring of building or civil engineering structure and it often requires Vibration Measurement. For the Vibration Measurement via wireless network, time synchronization is indispensable. In this paper, we introduce a newly developed time synchronized wireless sensor network system. The system employs IEEE 802.11 standard based TSF counter and sends the measured data with the counter value. It enables consistency on common clock among different wireless nodes. We describe the accuracy evaluation by simulation studies when the size of nodes increased. The hardware and software specifications of the developed wireless sensing system are shown. The experiments were conducted in a three-story reinforced concrete building and results showed the system performs more than sufficiently.
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Time synchronized wireless sensor network and its application to building Vibration Measurement
IECON 2007 - 33rd Annual Conference of the IEEE Industrial Electronics Society, 2007Co-Authors: Yutaka Uchimura, Tadashi Nasu, Motoichi TakahashiAbstract:Network based wireless sensing has become an important area of research and various new applications for remote sensing are expected to emerge. One of the promising applications is structural health monitoring of building or civil engineering structure and it often requires Vibration Measurement. For the Vibration Measurement via wireless network, time synchronization is indispensable. In this paper, we introduce a newly developed time synchronized wireless sensor network system. The system employs IEEE 802.11 standard based TSF counter and sends the measured data with the counter value. It enables consistency on common clock among different wireless nodes. We describe the accuracy evaluation by simulation studies when the size of nodes increased. The hardware and software specifications of the developed wireless sensing system are shown. The experiments were conducted in a three-story reinforced concrete building and results showed the system performs more than sufficiently.
Jingyuan Ko - One of the best experts on this subject based on the ideXlab platform.
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real time nanometer Vibration Measurement with a self mixing microchip solid state laser
Optics Letters, 2002Co-Authors: Kenju Otsuka, Jingyuan KoAbstract:Nanometer Vibration analysis of a target has been demonstrated by a self-aligned optical feedback vibrometry technique that uses a laser-diode-pumped microchip solid-state laser. The laser output waveform, which was modulated through interference between a lasing field and an extremely weak <-100‐dB frequency-modulated (FM) feedback field, was analyzed by the Hilbert transformation to yield the Vibration waveform of the target. Experimental signal characteristics have been reproduced by numerical simulations. Real-time Vibration Measurement has also been achieved with a simple FM demodulation circuit.
