Phase Difference Correcting Spectrum Method Based on All-phase Spectrum Analysis

2011 ◽  
Vol 30 (2) ◽  
pp. 293-297 ◽  
Author(s):  
Xiang-dong Huang ◽  
Zhao-hua Wang
Keyword(s):  
Phase Difference ◽  
Spectrum Analysis ◽  
Phase Spectrum ◽  
Spectrum Method

Parameter Estimation of Low-Frequency Signal with Negative Frequency Contribution

2013 ◽  
Vol 380-384 ◽  
pp. 3457-3460 ◽  
Author(s):  
Si Wei Tan ◽  
Zhi Liang Ren ◽  
Jiong Sun
Keyword(s):  
Parameter Estimation ◽  
Phase Difference ◽  
Spectrum Analysis ◽  
Low Frequency ◽  
High Accuracy ◽  
Signal Parameter ◽  
Frequency Signal ◽  
Spectrum Method ◽  
Analysis Theory ◽  
Simulation Results

According to the problem that there is a decline in accuracy of low-frequency signal parameter estimation by using the algorithm of all-phase FFT, an improved phase difference correcting spectrum method based on all-phase FFT is proposed. The contribution of negative frequency to FFT calculation was considered while using phase difference correcting spectrum method. The all-phase FFT spectrum analysis theory was presented as well as a traditional phase difference correcting method based on it. The equations of parameter estimation such as frequency, amplitude and phase for low-frequency signals were derived with the negative frequency contribution to spectrum analysis. The simulation results show that the method proposed in this paper can be used to estimate the parameters of low-frequency signals in a high accuracy, and also achieves an improvement in anti-noise ability.

Field experiment data processing of Fourier telescopy based on all phase spectrum analysis

2012 ◽  
Vol 20 (10) ◽  
pp. 2275-2282 ◽  
Author(s):  
于树海 YU Shu-hai ◽  
王建立 WANG Jian-li ◽  
董磊 DONG Lei ◽  
刘欣悦 LIU Xin-yue
Keyword(s):  
Data Processing ◽  
Field Experiment ◽  
Spectrum Analysis ◽  
Phase Spectrum ◽  
Experiment Data

Object Reconstruction of Fourier-Telescopy Based on All-Phase Spectrum Analysis

2010 ◽  
Vol 30 (12) ◽  
pp. 3441-3446 ◽  
Author(s):  
陈卫 Chen Wei ◽  
黎全 Li Quan ◽  
王雁桂 Wang Yangui
Keyword(s):  
Spectrum Analysis ◽  
Phase Spectrum ◽  
Object Reconstruction

Study on Porcelain Acoustic Emission Signal Based on All Phase Spectrum Analysis

2011 ◽  
Vol 391-392 ◽  
pp. 569-574
Author(s):  
Ding Ye ◽  
Wei Jin ◽  
Chen Xi Liu
Keyword(s):  
Acoustic Emission ◽  
Spectrum Analysis ◽  
Weighted Average ◽  
Phase Spectrum ◽  
Truncation Method ◽  
Emission Signal ◽  
Energy Leakage ◽  
Phase Signal ◽  
Ae Signal

In order to differentiate the porcelain quality, the paper introduces the All Phase spectrum analysis technology and studies on analyzing porcelain acoustic emission (AE) signal. As for the energy leakage by traditional signal truncation method in processing the signal, the all phase truncation method somewhat reduce the leakage which affects the follow-up porcelain quality discrimination. All instances consisting sample point are considered and weighted average technology is introduced to make amplitude-frequency clearer. According to the simulation, the energy leakage based on all phase signal processing is weakened and the spectrum is able to be accurate. It is more beneficial to the follow-up porcelain quality discrimination.

A Phase Spectrum Method for the Measurement of Liquid-Layer Thickness

2018 ◽  
Author(s):  
Quanchang Li ◽  
Junkai Ding ◽  
Wenbin Huang
Keyword(s):  
Layer Thickness ◽  
Liquid Layer ◽  
Thickness Measurement ◽  
Phase Spectrum ◽  
Point Of View ◽  
Multiple Reflections ◽  
Spectrum Method ◽  
Ultrasonic Technology ◽  
Allowable Range ◽  
Liquid Layer Thickness

Ultrasonic technology has been widely used to measure the thickness of lubricant film. The time delay between multiple reflections reflects the thickness of the liquid layer. As the thickness of liquid layer decreases, the measurement becomes more difficult owing to the overlapping of waveforms. Unlike the mainstream methods focusing on the characteristics of amplitude, a phase spectrum method is proposed in this paper to determine the thickness, which is much easier to operate and doesn’t need any extra noise reduction. It provides another point of view to solve the problem of film thickness measurement. This algorithm has been verified to test the liquid layer thickness ranging of 10–200 μm in a self-made experimental platform. Experimental results show that the thickness can be obtained accurately and the error is within the allowable range.

A Novel Phase Modulation Accelerometer

2015 ◽  
Vol 734 ◽  
pp. 113-117 ◽  
Author(s):  
Ying Yang ◽  
Xing Fei Li ◽  
Hong Biao Xiang
Keyword(s):  
High Precision ◽  
Spectrum Analysis ◽  
Phase Modulation ◽  
Phase Spectrum ◽  
Flexible Beam ◽  
The Novel ◽  
Acceleration Sensor ◽  
Mixing Effect ◽  
Acceleration Signal ◽  
Interference Signals

A novel phase modulation accelerometer based on self-mixing effect is presented. A quartz pendulous reed suspended by dual flexible beam is used as the first step sensing unit, which translates the acceleration signal to the displacement of quartz pendulous reed. The laser self-mixing interferometer reads out the displacement of quartz pendulous reed while the sensor experience acceleration. All-phase spectrum analysis is applied to detect the phase of self-mixing interference signals to reconstruct the acceleration. Finally, performances of the novel phase modulation accelerometer are measured by experiments. Experimental results indicate that the resolution of the acceleration sensor based on laser self-mixing interference can achieve sub micro-g. The phase modulation accelerometer has the potential to achieve high-precision, compact accelerometers.

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