Results 181 to 190 of about 4,455,887 (219)
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Self-demodulation of acoustic pulses in partially water-saturated river sand
Acoustical Physics, 2006Laboratory experiments on self-demodulation of high-frequency acoustic pulses in partially water-saturated river sand are reported. Based on experimentally revealed dependences of demodulated pulse parameters (propagation velocity, amplitude, and duration) on the static pressure and on the amplitude of the primary pulses, an equation of state for this ...
V. E. Nazarov +2 more
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Self-demodulated receiver at MM-wave range using SiGe technology
2011 International Symposium on Integrated Circuits, 2011In this paper, a new self-demodulated receiver at MM-wave range is proposed. In difference with the conventional local oscillator down-conversion, the OOK modulated data is recovered by mixing two paths of amplified RF signals. Thanks to the simplified architecture, the system is able to work at a significantly wider range with a lower power ...
X. P. Yu +7 more
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A novel multi-functional fiber grating sensor with self-demodulation and discrimination capabilities
PICALO 2008: 3rd Pacific International Conference on Laser Materials Processing, Micro, Nano and Ultrafast Fabrication, 2008A low-cost but multi-functional fiber grating sensor with self-demodulation and discrimination capabilities is presented. The sensor can measure strain, vibration, normal temperature (-10-100°C), high temperature (100-800°C) and pressure. There are three fiber Bragg gratings (FBGs) and one fiber long period grating (LPG) in the sensor system.
Yage Zhan +4 more
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Fourier formalism for describing nonlinear self-demodulation of a primary narrow ultrasonic beam
The Journal of the Acoustical Society of America, 1990Presented here is the derivation of nonlinear interactions that occur within a primary narrow beam for which the temporal spectrum is continuous and narrow. This follows the bases of the Fourier formalism. Acoustics levels are presumed weak enough so that second-order equations may be used.
Pierre Cervenka, Pierre Alais
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Novel tilt measurement method based on self-demodulated FBG sensor and pendulum clinometer
SPIE Proceedings, 2005A novel tilt measurement method is proposed based on self-demodulated fiber Bragg grating (FBG) sensor system, which consists of a couple of matched FBGs and a cantilever-based pendulum clinometer. With a cantilever structure, the tilt angle is measured by means of a differential form of Bragg wavelength shifting, with which the cross-sensitivity of ...
Jian Yang +4 more
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Temperature-compensated high pressure FBG sensor with a bulk-modulus and self-demodulation method
Sensors and Actuators A: Physical, 2005A free active element bulk-modulus based fiber Bragg grating (FBG) high pressure sensor and self-demodulation method for FBG wavelength shift signals are presented. With a simple isosceles triangle cantilever structure, problems of cross-sensitivity and chirped-signal in FBG sensor and are solved.
Jian Yang +3 more
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Sensor Letters, 2007
A micro-vibration measurement method is proposed based on isostrain cantilever structure and cascade self-demodulated fiber Bragg grating (FBG) pair. The micro-vibration is measured with a cantilever structure which can induce a differential shift of FBG pair's Bragg wavelengths.
Jian Yang +4 more
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A micro-vibration measurement method is proposed based on isostrain cantilever structure and cascade self-demodulated fiber Bragg grating (FBG) pair. The micro-vibration is measured with a cantilever structure which can induce a differential shift of FBG pair's Bragg wavelengths.
Jian Yang +4 more
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Japanese Journal of Applied Physics, 2020
Abstract Bone-conducted ultrasound (BCU) can be clearly perceived and can transmit speech information using amplitude-modulation (AM). BCU can also be perceived when presented to body parts like the neck, trunk and arms. When AM-BCUs propagate in the biological tissues with nonlinearity, like the cartilage, modulator signals may be ...
Koichiro Doi +3 more
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Abstract Bone-conducted ultrasound (BCU) can be clearly perceived and can transmit speech information using amplitude-modulation (AM). BCU can also be perceived when presented to body parts like the neck, trunk and arms. When AM-BCUs propagate in the biological tissues with nonlinearity, like the cartilage, modulator signals may be ...
Koichiro Doi +3 more
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Japanese Journal of Applied Physics, 2015
A novel hearing aid system utilizing amplitude-modulated bone-conducted ultrasound (AM-BCU) is being developed for use by profoundly deaf people. However, there is a lack of research on the acoustic aspects of AM-BCU hearing. In this study, acoustic fields in the ear canal under AM-BCU stimulation were examined with respect to the self-demodulation ...
Kazuhito Ito, Seiji Nakagawa
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A novel hearing aid system utilizing amplitude-modulated bone-conducted ultrasound (AM-BCU) is being developed for use by profoundly deaf people. However, there is a lack of research on the acoustic aspects of AM-BCU hearing. In this study, acoustic fields in the ear canal under AM-BCU stimulation were examined with respect to the self-demodulation ...
Kazuhito Ito, Seiji Nakagawa
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A 60-GHz injection locked oscillator for self-demodulation ultra-low power radio in 65-nm CMOS
2014 IEEE 21st Symposium on Communications and Vehicular Technology in the Benelux (SCVT), 2014This paper present a 60 GHz injection locked oscillator in 65-nm CMOS technology. The injection locked oscillator is a key component to realize an ultra-low power self-mixing architecture wake-up radio. In this paper, different methods of injecting a signal into the oscillator are discussed and the current re-use method is implemented to increase the ...
Hao Gao 0001 +5 more
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