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Ultrafast Detection Of Weak Signals
SPIE Proceedings, 1988ABSTRACT Femtosecond nonlinear detection techniques for weak signals are discussed. New methods for the characterization of femtosecond sig nals, in amplitude and phase, are presented. 1. INTRODUCTION Several nonlinear detection techniques have been developed with the passively mode- locked dye laser as a source, using the com bination of Rh6G as ...
J. C. Diels, N. Jamasbi, C. Yan, M. Lai
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Weak Signal Detection Based on Signal-Correlation Principle
2009 5th International Conference on Wireless Communications, Networking and Mobile Computing, 2009The weak signal embedded in various noises is the subject of weak signal detection, while the noises much stronger than the valuable signal, and must take measures to improve the S/N during measuring the signal. So based on the signal-correlation principle, separates the useful signal from the noises by the measured-method of signal-correlation ...
Daowen Liu, Lin Yao
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Frequency sensitivity in weak signal detection
Physical Review E, 1999The phenomenon of frequency sensitivity in weak signal detection has been studied via numerical simulation in the cases of a single neuron and a neuronal network, respectively. The membrane potential undergoes a damping oscillation to the quiescent state with a frequency of 11--33 Hz under a subthreshold bias.
Feng Liu, JiaFu Wang, Wei Wang
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Current progress on weak signal detection
2013 International Conference on Quality, Reliability, Risk, Maintenance, and Safety Engineering (QR2MSE), 2013In machinery condition monitoring, weak signal is a type of signal that has very low signal-to-noise ratio (SNR). Therefore, it is necessary to develop effective methods so as to enhance or extract useful information from the noisy signal. These methods aim to solve the problem of de-noising and separation of mixed-signal.
Jie Wang, Lu Yang, Long Gao, Qiang Miao
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Scenario Model for Weak Signal Detection
2011 Seventh International Conference on Signal Image Technology & Internet-Based Systems, 2011Due to multiplication of information sources as blogs or social networks, watchers have to deal with data in different formats and structures. Consequently, an adapted system, helpful for business intelligence activities, able to retrieve and process data from the Web, is required.
Emilien Bondu +4 more
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Weak signal detection using coherent control
Physical Review A, 2007We describe a technique based upon the principles of two-pathway coherent control that allows one to amplify the magnitude of a weak atomic or molecular transition. In our initial demonstrations, we amplify a weak Stark-induced transition (the 6s {sup 2}S{sub 1/2}{yields}8s {sup 2}S{sub 1/2} transition in atomic cesium) by coherently beating it with a ...
Mevan Gunawardena, D. S. Elliott
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Weak signal detection using suboptimum quantization
[1991] IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings, 2002A suboptimum quantization-detection system in which the locally optimum nonlinearity is replaced by a uniform quantizer and a coder for the uniform quantizer output levels is proposed. The proposed detection system does not require iterations to obtain the parameters of the quantizer and is easily implementable in practice.
null Taek Sang Oh +2 more
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Applied Stochastic Models in Business and Industry, 2019
AbstractChanges in the behavior of dynamic systems are detected based on changes in the monitored quantities or their characteristics. This detection usually takes place by monitoring the time evolution of a variable and detecting the change at the time when a predetermined threshold is exceeded.
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AbstractChanges in the behavior of dynamic systems are detected based on changes in the monitored quantities or their characteristics. This detection usually takes place by monitoring the time evolution of a variable and detecting the change at the time when a predetermined threshold is exceeded.
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Methods for Detecting Weak Light Signals
Journal of the Optical Society of America, 1968Theoretical and experimental evaluation of three low-level photodetection techniques, namely, lock-in, noise-voltage, and electron-pulse counting are presented. The 992 cm−1 Raman band of benzene excited by a 4.2-mW He–Ne laser operating at 6328 A provided a weak light signal which was detected by an EMI 9558 A, cooled photomultiplier.
R. R. Alfano, N. Ockman
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Weak signal detection: Condition for noise induced enhancement
Digital Signal Processing, 2013For the detection of a weak known signal in additive white noise, a generalized correlation detector is considered. In the case of a large number of measurements, an asymptotic efficacy is analytically computed as a general measure of detection performance.
Duan, F. +2 more
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