An interferometric vibrometer using phase carrier generated by liquid surface acoustic waves and an improved phase demodulation scheme

Zhang, Lieshan; Kong, Weixin; Wang, Meibao; Li, Rongsen; Wang, Ying

doi:10.1016/j.optcom.2021.127114

Cited by 9 publications

(2 citation statements)

References 24 publications

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“…Experimental results show that the proposed algorithm has the best demodulation performance that is insensitive to the phase modulation depth. The actual values of water surface acoustic wave amplitudes is difficult to obtain, but the relationship between water surface acoustic wave amplitudes and driving signal intensity shown in Figure 19a,b is in line with theoretical analysis (an expression of the relationship between the three parameters is provided in Reference [25]). This proves the accuracy and effectiveness of the sinusoidal phase modulation interferometer and the prenormalized PGC-Arctan algorithm in water surface acoustic wave detection.…”

Section: Experiments On Amplitude Detection Of Water Surface Acoustic...supporting

confidence: 71%

Detection of Water Surface Acoustic Waves Using Sinusoidal Phase Modulation Interferometer and Prenormalized PGC-Arctan Algorithm

Zhang,

Fang,

Yang

et al. 2024

Photonics

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A sinusoidal phase modulation laser interferometer is proposed to detect water surface acoustic waves excited by underwater acoustic radiation, and an improved PGC-Arctan demodulation algorithm that combines prenormalization and Lissajous ellipse fitting is proposed to demodulate detection signals. In this paper, the effects of phase modulation depth, carrier phase delay, and interference signal visibility on the Lissajous figure formed by quadrature interference components are analyzed. The demodulation algorithm first uses the amplitudes of multiple Fourier spectral components of an interference signal to calculate the phase modulation depth C, and calculation of the carrier phase delay Vc is achieved through the introduction of a quadrature carrier signal. Then, certain coefficients regarding C and Vc are constructed for prenormalization of the two quadrature interference signal components to eliminate the local nonuniform widening phenomenon of Lissajous ellipse. Next, the outer and the inner contours are extracted from a uniformly widened Lissajous ellipse resulting from light intensity disturbance, and the axial ratio of the ellipse is obtained, which is used to correct the ratio of the quadrature interference signal to eliminate the effect of filter gain coefficients. At last, through the combination of an Arctan algorithm and a phase-unwrapping algorithm, high-precision demodulation of the interference signal is realized. A sinusoidal phase modulation interferometer was set up to detect water surface acoustic waves, and a series of detection experiments were carried out. The experiment results show that the detection method and demodulation algorithm described in this paper can accurately realize the measurement of weak water surface acoustic waves. The proposed algorithm shows less distortion in demodulation results, and its signal-to-noise distortion ratio is less than 20 dB at 500 Hz, which is significantly better than traditional algorithms. The experimental results demonstrate the effectiveness and accuracy of water surface acoustic wave detection using sinusoidal phase modulation interferometer.

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Section: Experiments On Amplitude Detection Of Water Surface Acoustic...supporting

confidence: 71%

Detection of Water Surface Acoustic Waves Using Sinusoidal Phase Modulation Interferometer and Prenormalized PGC-Arctan Algorithm

Zhang,

Fang,

Yang

et al. 2024

Photonics

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“…Demodulation of the LDV signal is the process of extracting the instantaneous frequency of the Doppler signal [13]. There are two existing methods for demodulating Doppler signals, frequency domain, and time domain methods, namely the phase method and the periodic distribution method (or the zero-crossing-counting method) [14].…”

Section: Introductionmentioning

confidence: 99%

Reference velocity demodulation method for accelerometer shock testing based on enhanced CEEMD and threshold correction

Zhang,

Song

et al. 2023

Meas. Sci. Technol.

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High-G accelerometers are critical for measuring high shock signals and must be calibrated to improve measurement accuracy. A laser Doppler velocimeter (LDV) is required to calibrate a high-G accelerometer to provide a high-precision reference velocity. The LDV signal must be demodulated to obtain the velocity. However, the phase method is susceptible to noise interference, while the conventional periodic distribution method is challenging to demodulate and severely affected by signal oscillations. We propose a novel periodic distribution method based on enhanced complementary ensemble empirical mode decomposition (CEEMD) and threshold correction (PDECTC) to demodulate the LDV signal. First, the LDV signal is processed with CEEMD to obtain multiple intrinsic mode functions (IMFs) and the residual. Next, each IMF is partially zeroed to obtain the noise-reduced LDV signal. Then, the over-threshold peak of the noise-reduced LDV signal is calculated. Finally, the demodulated velocity of the LDV signal is obtained by correcting the noise-reduced LDV signal according to the over-threshold peak point and calculating all the zero points. Simulation and experimental results show that the proposed method outperforms the phase method based on enhanced CEEMD (PEC) and the periodic distribution method based on enhanced CEEMD (PDEC) and can significantly reduce noise interference. The results show that the proposed method can accurately demodulate the LDV signal to obtain a highly accurate reference velocity, improving the reliability of accelerometer shock testing.

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Coherent Gradient Sensing Spatial Carrier Method and its Application for In-Situ Dynamic Deformation Monitoring in Laser Repair Process

Zhong

Xie

et al. 2023

Exp Mech

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An interferometric vibrometer using phase carrier generated by liquid surface acoustic waves and an improved phase demodulation scheme

Cited by 9 publications

References 24 publications

Detection of Water Surface Acoustic Waves Using Sinusoidal Phase Modulation Interferometer and Prenormalized PGC-Arctan Algorithm

Detection of Water Surface Acoustic Waves Using Sinusoidal Phase Modulation Interferometer and Prenormalized PGC-Arctan Algorithm

Reference velocity demodulation method for accelerometer shock testing based on enhanced CEEMD and threshold correction

Coherent Gradient Sensing Spatial Carrier Method and its Application for In-Situ Dynamic Deformation Monitoring in Laser Repair Process

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