Results 191 to 200 of about 4,455,887 (219)

A self-demodulated fiber Bragg grating for investigating impact-induced transient responses of phononic crystal beams

Journal of Sound and Vibration, 2018
Abstract This work presents a fiber Bragg grating (FBG) displacement sensing system to experimentally investigate the dynamic behaviors of phononic crystal (PC) beams through impact-induced early short time or long time transient responses. Based on the couple-mode theory and the optical transfer matrix (T-matrix) formulation, we first show that it ...
Kuo-Chih Chuang, Zhi-Wen Yuan, Y.Q. Guo, Xu-Feng Lv   +3 more
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Self demodulation of a pulse of finite amplitude: Does a double hump really exist?

The Journal of the Acoustical Society of America, 1983
During the last meeting of the ASA, some results were presented using a line and cone transducer excited by a pulse modulator [G. L. Sackman, R. L. Eyman, P. J. Lastrange, and A. H. Seeman, J. Acoust. Soc. Am. Suppl. 1, 72, S98 (1982)]. This transducer employs the theory of a parametric transient effect presented by O. R. Berk tay [J. Sound Vib.
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Comparative analysis of different distortion reduction techniques for parametric loudspeaker based on self-demodulation of amplitude modulated ultrasound waves

2008 Second International Conference on Electrical Engineering, 2008
A highly focused sound beam can be created from the nonlinear interaction of ultrasound waves by using a parametric loudspeaker. An audio signal is produced by the self-demodulation of amplitude modulated sound waves in air. Several preprocessing techniques have been discussed in previous literature to reduce distortion. A comparative analysis of these
J. Munir, U. Imtiaz
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A 12-mW 40–60-GHz 0.18-$\mu {\hbox {m}}$ BiCMOS Oscillator-Less Self-Demodulator for Short-Range Software-Defined Transceivers

IEEE Journal on Emerging and Selected Topics in Circuits and Systems, 2013
In this paper, key design considerations in self-demodulators at millimeter wave range for short-range software-defined transceivers are presented. Oscillator-less demodulators are used to achieve a wide operating range with low power consumption. The proposed demodulator, featured with a new single-input differential-output low noise amplifier and ...
Xiaopeng Yu 0002, Zhenghao Lu, Bo Yu Hu, Wei Meng Lim, Er Tai Duo, Kiat Seng Yeo   +5 more
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Self-demodulation of amplitude- and frequency-modulated pulses in a thermoviscous fluid

1993
2876
Averkiou, Michalakis A., Lee, Yang-Sub, Hamilton, Mark F., Averkiou, Michalakis A., Lee, Yang-Sub, Hamilton, Mark F.   +5 more
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Theory of Energy Flux and Polarisation Changes of a Radio Wave with Two Magnetoionic Components Undergoing Self Demodulation in the Ionosphere

Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences, 1974
Abstract The absorption of a powerful plane radio wave vertically incident on the lower ionosphere is studied. If it contains the two magnetoionic components with roughly equal amplitudes, the power absorbed per unit volume can be either greater or less than the sum of the powers for the separate components, depending on their phase ...
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Self-demodulation effects in nonlinear focused beams

2011 IEEE International Ultrasonics Symposium, 2011
Petr Konicek, Michal Bednarik, Milan Cervenka   +2 more
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Demodulation of fiber-optic Fabry-Perot sensors through a double-frequency self-correlation method

Optical Fiber Technology, 2021
Haibin Chen, Zilong Guo
exaly  

Self-compensation three-wavelength demodulation method for the large phase extraction of extrinsic Fabry–Pérot interferometric sensors

Optics and Lasers in Engineering, 2023
Guowen An, Wenyi Liu, Pinggang Jia
exaly  

Some remarks on the theory of self-demodulation

Il Nuovo Cimento, 1956
openaire   +1 more source