FSI-based non-cooperative target absolute distance measurement method using PLL correction for the influence of a nonlinear clock

Lu, Cheng; Xiang, Yong; Guo, Yu; Liu, Bingguo; Chen, Fengdong; Liu, Xiaosheng; Liu, Guodong

doi:10.1364/ol.43.002098

Cited by 32 publications

(12 citation statements)

References 14 publications

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“…The first is the use of active linear control techniques for direct feedback control of the laser source. A phase-locked loop (PLL) is used to compare the signal from the interferometer with the reference signal through a lock-in amplifier, and the resulting error signal is fed back to the laser to achieve correction of laser nonlinearity . In 2015, Qin et al used a composite feedback loop to achieve dual suppression of laser scanning nonlinearity and random frequency noise to achieve a resolution of 2 mm and 17.5 cm at 50 and 750 m, respectively .…”

Section: Introductionmentioning

confidence: 99%

High-Precision Silicon-Integrated Frequency-Modulated Continuous Wave LiDAR Calibrated Using a Microresonator

Zheng

Jia

et al. 2022

ACS Photonics

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Frequency-modulated continuous wave (FMCW) LiDAR can achieve long-distance and high-precision measurement, and the ranging error mainly comes from the nonlinearity of the laser frequency sweep. In this study, a high-precision silicon-integrated FMCW LiDAR is proposed. An equal frequency hypercube network is established by the stable free spectral range (FSR) of the microresonator to calibrate the nonlinearity of FMCW, and the distance matrix is obtained by analyzing the phase difference matrix of the FMCW signal. A standard length-based microresonator FSR calibration scheme is used to further improve the LiDAR accuracy. The feasibility of the scheme is verified by ranging and three-dimensional (3D) imaging. The ranging is carried out indoors and outdoors. In the indoor environment of a distance of 4 m, the minimum Allan deviation is 65 nm at 10.24 s. In the outdoor environment, the minimum Allan deviation at 438 m is 420 nm at 10.24 s. The 3D imaging can reconstruct the spatial point cloud of the objects and identify the spatial targets. This scheme has good on-chip integration capability and can be further combined with lens-assisted beam steering and optical phased array, laying the foundation for compact, large bandwidth, long-range, and high-precision LiDAR.

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Section: Introductionmentioning

confidence: 99%

High-Precision Silicon-Integrated Frequency-Modulated Continuous Wave LiDAR Calibrated Using a Microresonator

Zheng

Jia

et al. 2022

ACS Photonics

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“…From Equation ( 7), we can see that when the sweeping cycle becomes small, the distance change in one sweeping cycle will also be small. At this time, take Equation (8) into Equation (7), let L dyn (T), which is the distance at the end moment T of a sweeping cycle, represent the distance after the whole sweeping cycle. It is:…”

Section: Principle Of Reducing the Doppler-induced Errormentioning

confidence: 99%

“…Warden et al [5,6] presented a dual-FSI system with a gas absorption cell to achieve dynamic OPD measurement at any sampling point. Pollinger and Liu et al [7,8] used an additional heterodyne interferometry to directly measure the target movement and used an FSI system to calculate the distance. Shao Bin et al [9] reported a fixed-frequency laser to measure the target velocity and used a FSI system to calculate the distance.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Distance Measurement Based on a Fast Frequency-Swept Interferometry

Chen

Lin

et al. 2022

Sensors

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To improve the precision of dynamic distance measurement based on the frequency-swept interferometry (FSI) system, a Doppler-induced error compensation model based on a scheme increasing the frequency sweeping rate is proposed. A distance demodulation method based on a Fourier transformation is investigated when the defined quasi-stationary coefficient approaches a constant. Simulations and experiments based on dynamic distance with a sinusoidal change demonstrate that the proposed method has a standard deviation of 0.09 μm within a distance range of 4 μm at a sweeping rate of 60 KHz.

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“…As a famous absolute distance measurement technique, frequency-swept interferometry (FSI) is widely used in various ranging applications. Since the dynamic accuracy of FSI is severely restricted by the well-known Doppler effect [23][24][25], the previously reported works mainly focused on the elimination of the Doppler error of FSI [23][24][25][26][27][28][29][30][31][32]. Because the goal of these methods was to measure the absolute dynamic distance, they were not applied for the measurement of the rotor parameters.…”

Section: Introductionmentioning

confidence: 99%

Multi-Parameter Measurement of Rotors Using the Doppler Effect of Frequency-Swept Interferometry

Shao

Wei

Zhang

et al. 2020

Sensors

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The Doppler effect of frequency-swept interferometry (FSI) is often seen as an obstacle to the dynamic ranging accuracy. However, the potential of this obstacle is rarely noticed and used. In this paper, by combining the periodical characteristics of the rotational Doppler effect, an FSI-based multi-parameter measurement method for the rotor is proposed. Through the establishment of the rotational Doppler formula of FSI, it is found that the frequency, direct component, and amplitude of the dynamic distance given by FSI can be utilized to estimate the angular velocity, axial clearance, and tilt angle of the rotor, respectively. A rotor platform and a fiber-optic FSI system were constructed, and a series of experiments were carried out to verify the proposed method. The experimental results showed that the relative errors of the measured axial clearance, angular velocity, and tilt angle were less than 3.5%. This work provides a new perspective on the multi-parameter measurement of the rotor and makes it possible to directly perform multi-parameter measurement inside the space-confined rotating machinery as only a single small-size fiber-optic probe is needed.

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FSI-based non-cooperative target absolute distance measurement method using PLL correction for the influence of a nonlinear clock

Cited by 32 publications

References 14 publications

High-Precision Silicon-Integrated Frequency-Modulated Continuous Wave LiDAR Calibrated Using a Microresonator

High-Precision Silicon-Integrated Frequency-Modulated Continuous Wave LiDAR Calibrated Using a Microresonator

Dynamic Distance Measurement Based on a Fast Frequency-Swept Interferometry

Multi-Parameter Measurement of Rotors Using the Doppler Effect of Frequency-Swept Interferometry

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