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spectrum correction in Study of Solvation Dynamics by Fluorescence Non-collinear Optical Parametric Amplification Spectroscopy

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Chinese Journal of Chemical Physics 2016年第1期29卷 147-150,I0003页

作者：党伟白晶晶张连水翁羽翔河北省光电信息材料重点实验室河北大学物理科学与技术学院保定071002 中国科学院物理研究所软物质物理重点实验室北京100190

Femtosecond time-resolved fluorescence non-collinear optical parametric amplification spec- troscopy can extract the curve of spectral gain from its parametric superfluorescence. This unique spectrum correction method enables fluorescence non-collinear optical parametric amplification spectroscopy acquiring the genuine transient fluorescence spectrum of the studied system. In this work we employ fluorescence non-collinear optical parametric amplification spectroscopy technique to study the solvation dynamics of DCM dye in ethanol solution, and confirm that genuine solvation correlation function and shift of peak frequency can be derived from transient fluorescence spectra after the spectral gain correction. It demonstrates that fluorescence non-collinear optical parametric amplification spectroscopy can benefit the research fields, which focuses on both fluorescence intensity dynamics and fluorescence spectral shape evolution.

关键词： Transient fluorescence spectrum Solvation dynamics Non-collinear optical parametric amplification spectrum correction

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Timedelay based all-frequency correction method for discrete spectrum

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High Technology Letters 2011年第1期17卷 106-111页

作者：秦强 Jiang Zhinong He Wei Feng Kun Diagnosis and Self-recovery Engineering Research Center Beijing University of Chemical Technology Beijing 100029 P. R. China

Many spectrum correction methods have been developed, but their performance degrades significantly when they are applied to the correction of low frequency component （ LFC ）. It owns to that the model underlying the conventional approaches neglects the interference of the negative frequency in the real signal. A new approach for the correction of the LFC is proposed, which suits all kinds of symmetrical windows. It divides a signal into three sections and makes use of the first spectrum line of each section. Then this approach is modified so that it is also applicable to the correction of the high frequency component. Thus a timedelay-based all-frequency correction method is proposed. The simulation results show that this method is simple and feasible. By this method, the accurate frequency, amplitude and phase of the spectral line can be obtained whether it is close to or far from OHz.

关键词： signal analysis fault diagnosis discrete spectrum low frequency spectrum correction

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Anti-Noise Performance of the FT Continuous Zoom Analysis Method for Discrete spectrum

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Chinese Journal of Mechanical Engineering 2010年第6期23卷 774-779页

作者： LINHuibin DING Kang XU Chuanyan School of Mechanical and Automotive Engineering South China University of Technology Guangzhou 510640 China Guangdong Key Lab for Automotive Engineering Guangzhou 510640 China

As a discrete spectrum correction method, the Fourier transform （FT） continuous zoom analysis method is widely used in vibration signal analysis, but little effort had been made on this method＇s anti-noise performance. It is widely believed that the analysis accuracy of the method can be substantially improved by increasing the zoom multiple, however, with the zoom multiple increases, the frequency estimation accuracy may decline sometimes in practices. Aiming at the problems above, this paper analyzes the sources of frequency estimation error when a harmonic signal mixed with and without noise is processed using the FT continuous zoom analysis. According to the characteristics that the local maximum of the zoom spectrum may be wrongly selected when the signal is corrupted with noise, the number of wrongly selected spectrum lines is deduced under different signal-to-noise ratio and local zoom multiple, and then the maximum frequency estimation error is given accordingly. The validity of the presented analysis is confirmed by simulations results. The frequency estimation accuracy of this method will not improve any more under the influence of noise, and there is a best zoom multiple, when the zoom multiple is larger than the best zoom multiple; the maximum frequency estimation error will fluctuate back and forth. The best zoom multiple curves under different signal-to-noise ratios given provide a theoretical basis for the choice of the appropriate zoom multiples of the FT continuous zoom analysis method in engineering applications.

关键词： spectrum spectrum correction zoom analysis anti-noise performance

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A high-precision two-window three-spectral line interpolation harmonic detection algorithm

A high-precision two-window three-spectral line interpolatio...

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第40届中国控制会议

作者： Peng Yonglong Ma Xihao Li Yabin Feng Hailong School of Electrical and Electronic Engineering North China Electric Power University

In order to improve the detection accuracy of harmonic and inter-harmonic parameters of power system, to reduce the effect of fence effect and spectrum leakage, the interpolated harmonic detection algorithm of the three-spectral line of nuttall window is ***, the algorithm calculates the base wave frequency by using the magnitude of three adjacent spectral lines near the base wave frequency point, deduces the correction formula of the harmonic amplitude and frequency parameters, and then, based on all-phase FFT, ap FFT, The phase invariance, using the base wave frequency point near the main spectral line and side spectral line amplitude to calculate the ratio, the two-window ap FFT interpolation spectrum correction algorithm, and then proposed the addition of Nuttall window three-spectrum line interpolation detection frequency and amplitude, Nuttall window double window ap FFT correction detection phase combination *** simulation experiments show that compared with other interpolation algorithms, the algorithm can reduce the detection error of harmonic parameters more effectively and measure higher accuracy.

关键词： Barrier effect Nuttall window correction formula all phase Fourier analysis spectrum correction

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