Birefringent dual-frequency laser Doppler velocimeter using a low-frequency lock-in amplifier technique for high-resolution measurements

Zhu, Huajian; Chen, Junbao; Guo, Dongmei; Xia, Wei; Huang, Hui; Wang, Ming

doi:10.1364/ao.55.004423

Cited by 10 publications

(4 citation statements)

References 12 publications

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“…Dual-frequency laser coherent detection can be used to convert the higher laser frequency to the lower microwave frequency by the method of optical microwave, so as to achieve higher speed target detection [5][6][7]. Dual frequency laser coherence detection has better advantages in high precision measurement and has become a hot research field [8][9][10]. The four-optical coherent mixing detection method can realize the velocity measurement in a larger dynamic range by choosing the appropriate frequency difference and detector [11].…”

Section: Introductionmentioning

confidence: 99%

The influence of light source linewidth on power spectrum of four light coherent mixing signal

Ren¹,

Zhang²,

Zhang

et al. 2023

SPIE-CLP Conference on Advanced Photonics 2022

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The four-optical coherent mixing detection technology can improve the dynamic range of moving target detection. This method has the difficulty of distinguishing the type of mixing output signal. We propose a method to distinguish the signal type by using the different peaks of the mixed signal spectrum. Based on the statistical theory, the power spectrum function of the mixed signal is obtained, and the numerical analysis of the influence of the light source line width and the light source frequency difference on the signal power spectrum is carried out. Through numerical calculation and analysis, the results show that the increase of the light source linewidth will lead to the broadening of the signal power spectrum. When the Doppler frequency difference is greater than 1/5 times the linewidth of the light source, the power spectrum of the two homodyne coherent signals in the four-light coherent mixing can be distinguished; when the Doppler frequency difference is less than 1/5 times the light source linewidth , The power spectrum of the two homodyne coherent signals in four-optical coherent mixing can not be distinguished.

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Section: Introductionmentioning

confidence: 99%

The influence of light source linewidth on power spectrum of four light coherent mixing signal

Ren¹,

Zhang²,

Zhang

et al. 2023

SPIE-CLP Conference on Advanced Photonics 2022

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show abstract

“…At this LMM-based measurement, estimation of single frequency sinusoid with high resolution and high sampling rate is necessary to calculate Doppler Frequency Shift from interferometer's output [18], [20], [21]. To obtain the frequency, we need to calculate the output signal from photodiode which connected to digitizer by frequency estimation method program [22].…”

Section: Introductionmentioning

confidence: 99%

Development of a New Data Processing System for Increasing the Accuracy of a Levitation Mass Method (LMM) based Measurement

Satria

Hendro

Fujii

et al. 2021

NMJ

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Levitation Mass Method (LMM) is the method as a material tester to evaluate the mechanical response of general objects against impact forces. In this method, a mass is made to collide with material to be tested and the impulse, i.e. the time integration of the impact force, is measured highly accurately as a change in momentum of the mass. To realize linear motion with sufficiently small friction acting on the mass, a pneumatic linear bearing is used. The inertial force acting on the mass is calculated from the velocity of the mass. The velocity is determined, highly accurately by means of measuring the Doppler shift frequency of a laser light beam reflected on the mass using an optical interferometer. To determine the Doppler frequency shift for LMM data processing, the method for estimating the frequency is necessary. Several methods have been developed to estimate the frequency for the LMM data processing with high accuracy, i.e. Zero-Crossing Average Method (ZAM), Zero-Crossing Fitting Method (ZFM), Sine Wave Fitting, and Zero-crossing Sine Wave Fitting. All methods realized using the zero-crossing point of the waveform obtained from the digitizer. A better method to estimate frequency on the digitized waveform will enable higher precision for a more accurate result. In this research, a new method that can improve the accuracy has been developed. The program was developed using data segmentation to obtain the frequency of the digitized waveforms. The developed program has the smallest error ( 1,98 X 10^-10 for N= 200) compare to other methods (2,31 X 10-3 for ZAM; 1,10X10-3 for ZFM; and 8,69 X10-4 for Zero-crossing Sine Wave Fitting).

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“…Besides the analysis of SNR of the LDV, diverse optical configurations and signal processing methods have been reported in the scientific literature and by commercial manufacturers. With the birefringent dual-frequency LDV and a new signal-processing scheme based on a digital signal processor lock-in amplifier and a low-frequency demodulation algorithm, the average velocity resolution of this dual-frequency LDV is improved from 0.31 to 0.028 mm/s due to the characteristics of good directionality, low speckle noise, and good coherence [ 27 ]. By using the 1550 nm all-fiber pulsed LDV and a new digital range gated signal processing method, the cochannel interference can be eliminated, and the SNR of the demodulated signal is improved consequently [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

Development of a High-Resolution All-Fiber Homodyne Laser Doppler Vibrometer

Shang

Wang

et al. 2020

Sensors

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Based on the homodyne detection, a compact and cost-effective all-fiber laser Doppler vibrometer (LDV) with high resolution is presented. For the signal processing, the discrimination algorithm combined with the nonorthogonal correction is applied. The algorithm corrects the quadrature imbalance and other nonlinearity. In the calibration experiment, with the glass pasted on a piezoceramic transducer (PZT), the velocity resolution of 62 nm/s at 4 kHz and displacement resolution of 2.468 pm are achieved. For the LDV-based acousto-optic communication, the minimum detectable sound pressure level (SPL) reached 0.12 Pa under the hydrostatic air-water surface. The results demonstrate that the designed homodyne LDV has a low system background noise and can offer high precision in the vibration measurement.

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Birefringent dual-frequency laser Doppler velocimeter using a low-frequency lock-in amplifier technique for high-resolution measurements

Cited by 10 publications

References 12 publications

The influence of light source linewidth on power spectrum of four light coherent mixing signal

The influence of light source linewidth on power spectrum of four light coherent mixing signal

Development of a New Data Processing System for Increasing the Accuracy of a Levitation Mass Method (LMM) based Measurement

Development of a High-Resolution All-Fiber Homodyne Laser Doppler Vibrometer

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