High-Resolution FMCW Reflectometry Using a Single-Mode Vertical-Cavity Surface-Emitting Laser

Iiyama, Koichi; Matsui, Shin‐ichiro; Kobayashi, T.; Minamikawa, Takeo

doi:10.1109/lpt.2011.2131124

Cited by 41 publications

(7 citation statements)

References 10 publications

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“…Next, the local oscillator signal separated by coupler 1 travels through a delay fiber, which is then mixed with the echo signal reflected from a target through coupler 2. The mixed signal is coherently detected by detector D M [17]. At last, a digital acquisition card DAQ is used to sample the dechirp signals, and the data is sent to the computer for subsequent signal processing [18,19] The up observation of a triangular FMCW period is taken as an example to derive the influence of time-varying vibration errors on ranging.…”

Section: Time-varying Vibrations In Fmcw Lidar Signalsmentioning

confidence: 99%

Time-Varying Vibration Compensation Based on Segmented Interference for Triangular FMCW LiDAR Signals

Wang

et al. 2021

Remote Sensing

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Frequency modulation continuous wave (FMCW) light detection and ranging (LiDAR) 3D imaging system may suffer from time-varying vibrations which will affect the accuracy of ranging and imaging of a target. The system uses only a single-period FMCW LiDAR signal to measure the range of each spot; however, traditional methods may not work well to compensate for the time-varying vibrations in a single period because they generally assume the vibration velocity is constant. To solve this problem, we propose a time-varying vibration compensation method based on segmented interference. We first derive the impact of time-varying vibrations on the range measurement of the FMCW LiDAR system, in which we divide the time-varying vibration errors into primary errors caused by the vibrations with a constant velocity and quadratic errors. Second, we estimate the coefficients of quadratic vibration errors by using a segmented interference method and build a quadratic compensation filter to eliminate the quadratic vibration errors from the original signals. Finally, we use the symmetrical relations of signals in a triangular FMCW period to estimate the vibration velocity and establish a primary compensation filter to eliminate the primary vibration errors. Numerical tests verify the applicability of this method in eliminating time-varying vibration errors with only a one-period triangular FMCW signal and its superiority over traditional methods.

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Section: Time-varying Vibrations In Fmcw Lidar Signalsmentioning

confidence: 99%

Time-Varying Vibration Compensation Based on Segmented Interference for Triangular FMCW LiDAR Signals

Wang

et al. 2021

Remote Sensing

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“…The theoretical resolution ΔR of the laser frequency scanning interferometer can be expressed as [5]:…”

Section: Principlesmentioning

confidence: 99%

“…Laser frequency scanning interference measurements involve completing heterodyne calculations of transmitted and local light to measure distances [1][2][3][4][5]. This method is advantageous in that it does not produce range ambiguities, it exhibits strong anti-interference capacities and non-cooperative targets, and it is highly precise.…”

Section: Introductionmentioning

confidence: 99%

Dispersion compensation method based on focus definition evaluation functions for high-resolution laser frequency scanning interference measurement

Liu

et al. 2017

Optics Communications

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“…In 2011, Liyama et al used a single-mode vertical-cavity surface-emitting laser as the light source. It swept the laser frequency by injection current method, and the spatial resolution of 250 μm in the air was achieved for a target at about 4 cm [9]. Furthermore, the method based on photoelectric feedback to eliminate optical frequency nonlinearity is complicated and costly [10].…”

Section: Introductionmentioning

confidence: 99%

Absolute Distance Measurement Using Frequency-Scanning Interferometry Based on Hilbert Phase Subdivision

Jiang

Liu

Wang

et al. 2019

Sensors

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In order to eliminate the influence of laser frequency nonlinearity, the frequency-scanning interferometry (FSI) often uses the beat signal of an auxiliary interferometer as the external clock. The time points at every amplitude peaks and bottoms of the auxiliary beat signal are selected as the sampling time points for the main interferometer signal. To satisfy the Nyquist sampling requirement, the optical path difference (OPD) of the delay fiber in auxiliary interferometer should be at least twice longer than the measurement distance. In this paper, we proposed a method to shorten the length of delay fiber. The Hilbert transform was used to extract the phase of the auxiliary interference signal and calculate the time points corresponding to subdivided phase intervals. Then, the main interference signal was resampled at these moments, and the fast Fourier transform was performed on the resampled signal. The experimental results showed that the target at the distance of about 5 m was measured when the OPD of the auxiliary interferometer was about 4.5 m. The standard deviation of the distance measurement results could reach 4.64 μm.

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High-Resolution FMCW Reflectometry Using a Single-Mode Vertical-Cavity Surface-Emitting Laser

Cited by 41 publications

References 10 publications

Time-Varying Vibration Compensation Based on Segmented Interference for Triangular FMCW LiDAR Signals

Time-Varying Vibration Compensation Based on Segmented Interference for Triangular FMCW LiDAR Signals

Dispersion compensation method based on focus definition evaluation functions for high-resolution laser frequency scanning interference measurement

Absolute Distance Measurement Using Frequency-Scanning Interferometry Based on Hilbert Phase Subdivision

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