Self-mixing interferometry based on all phase FFT for high-precision displacement measurement

Kou, Ke; Li, Xingfei; Yang, Ying; Wang, Cuo; Li, Li

doi:10.1016/j.ijleo.2014.08.128

Cited by 12 publications

(3 citation statements)

References 17 publications

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“…The laser modulation spectrum analysis technology uses laser intensity modulation signals with predetermined frequencies as carriers and utilizes fast Fourier transform (FFT) to extract amplitude, frequency, phase, and other signal information for laser intensity analysis [25][26][27]. Wang et al [28] effectively mitigated signal fluctuations and vibration interference in confocal measurement by integrating laser modulation spectrum analysis technology with laser power monitoring.…”

Section: Introductionmentioning

confidence: 99%

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Light transmittance measurement method of solid rocket motor plume based on laser modulation spectrum analysis

Yang,

Ye,

Qiang

et al. 2024

Propellants Explo Pyrotec

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The light transmittance measurement method, which is used to characterize smoke characteristic signal of solid rocket motor plume, can provide important reference for development and design of low smoke characteristic signal solid propellants and motors. The light transmittance measurement method of solid rocket motor plume based on laser modulation spectrum analysis is proposed in this paper. By using a 405 nm laser as the light source and a narrow‐band filter detection method, the influence of plume radiation on the measurement of light transmittance of solid rocket motor plume smoke can be minimized. Additionally, combined with the laser modulation spectrum analysis technology, the signal amplitude is selected by the laser modulation frequency to improve the signal‐to‐noise ratio of the signal. Compared with the laser constant current measuring mode, laser high‐frequency modulation measuring mode with spectrum analysis effectively improves the optical transmittance measurement accuracy. Based on this, a solid rocket motor plume smoke transmittance test system is developed to measure the plume smoke of standard test motors with different propellants and combustion chamber pressures. The results demonstrate that the system can effectively measure the light transmittance of the plume smoke. The light transmittance of solid rocket motor plume can be increased by reducing the aluminum content of solid propellant or increasing the pressure of the combustion chamber. Thus, this research provides an effective measuring tool for evaluating smoke concentration of solid rocket motor plume, which is beneficial to develop low smoke characteristic signal solid propellants and motors.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Light transmittance measurement method of solid rocket motor plume based on laser modulation spectrum analysis

Yang,

Ye,

Qiang

et al. 2024

Propellants Explo Pyrotec

View full text Add to dashboard Cite

show abstract

“…In recent years, a new signal analysis algorithm called all-phase spectrum analysis has been proposed in the field of information processing [22]. Since it presents good phase characteristics and improves leakage suppression, it has been applied to different fields of study, such as filter design, displacement measurement, and signal coherent fusion processing [23][24][25]. As regular DFT has problems with determination of the exact amplitude and frequency of the components of interest, as well as limited phase measurement accuracy [26], a previous paper has introduced the all-phase spectrum analysis into harmonic analysis [27].…”

Section: Introductionmentioning

confidence: 99%

Power harmonic and interharmonic detection method in renewable power based on Nuttall double‐window all‐phase FFT algorithm

Yang

Jin

et al. 2018

IET Renewable Power Generation

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Harmonics and interharmonics adversely affect power grids. The fast Fourier transform (FFT) algorithm is one of the most commonly used methods for harmonic analysis. However, in practical applications, the accuracy of harmonic analysis can be seriously affected by fence effect and spectral leakage, which are undesired characteristics inherent to discrete Fourier transforms. Moreover, when non-synchronous sampling is carried out, the phase measurement is not accurate enough, and there is a large error in the identification of interharmonics. In order to improve the measurement precision, the method of allphase spectrum analysis is used, since it has the characteristics of phase invariance and good spectral leakage suppression. A novel method based on improved Nuttall double-window all-phase FFT is proposed by improving the window function and the spectrum correction method for achieving higher precision. Through simulation and experimental verification, the proposed algorithm has proven to perform better than the traditional algorithms both for the detection of harmonics and interharmonics. In addition, the computation burden is not considerably increased when compared to such algorithms, which allows the on-line use of the proposed algorithm.

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Controlled extreme wave generation using an improved focusing method

Niu

et al. 2020

Applied Ocean Research

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Self-mixing interferometry based on all phase FFT for high-precision displacement measurement

Cited by 12 publications

References 17 publications

Light transmittance measurement method of solid rocket motor plume based on laser modulation spectrum analysis

Light transmittance measurement method of solid rocket motor plume based on laser modulation spectrum analysis

Power harmonic and interharmonic detection method in renewable power based on Nuttall double‐window all‐phase FFT algorithm

Controlled extreme wave generation using an improved focusing method

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