Coherent laser ranging for precision imaging through flames

Mitchell, Eric W.; Hoehler, Matthew S.; Giorgetta, Fabrizio R.; Hayden, Torrey R. S.; Rieker, Gregory B.; Newbury, Nathan R.; Baumann, Esther

doi:10.1364/optica.5.000988

Cited by 53 publications

(14 citation statements)

References 17 publications

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“…In general, there are two different categories of LiDAR, one is pulsed timeof-flight (TOF) LiDAR and the other is frequency modulated continuous wave (FMCW) LiDAR. Compared to TOF LiDAR, FMCW LiDAR uses coherent detection [7][8][9] to extract frequency information, thus it can be immune to direct sun light and interference from other LiDAR transmitters [3]. However, there is an unique advantage for a specially designed FMCW LiDAR which can simultaneously measure the 3D positions and one dimensional speed of a target in a single measurement spot so that it is often called four-dimensional (4D) measurement LiDAR [10,11].…”

Section: Introductionmentioning

confidence: 99%

Rapid Linear Frequency Swept Frequency-Modulated Continuous Wave Laser Source Using Iterative Pre-Distortion Algorithm

Zhang

Yao

2022

Remote Sensing

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We present a simple iterative pre-distortion algorithm for achieving a rapid linear frequency sweep of semiconductor lasers. The algorithm achieves the desired frequency swept linearity with only four iterations. We derive a general formula for iterative pre-distortion by establishing the relationship between the laser output frequency and the drive current. The linear frequency-swept laser source obtained by this algorithm can be used in FMCW LiDAR systems. Experimentally, we investigated the algorithm using a 1550 nm distributed feedback (DFB) laser, achieving frequency swept excursion of 30.26 GHz, and frequency swept slope of 504 THz/s. We analyzed the linearity of the frequency swept results for the fourth iteration, achieving less than 5 MHz root mean square (RMS) value of frequency swept nonlinearity.

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Section: Introductionmentioning

confidence: 99%

Rapid Linear Frequency Swept Frequency-Modulated Continuous Wave Laser Source Using Iterative Pre-Distortion Algorithm

Zhang

Yao

2022

Remote Sensing

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“…The emerging needs of high resolution ranging and imaging in the areas such as terrestrial altimetry fueled the interest in lidar systems 3,4 . Lidars perform ranging by either measuring the time-of-flight (ToF) of a laser pulse traveling from laser source to a target and back to a photodetector, or by generating the so-called radio frequency beat tones through the interference of reference light and the reflected light from a target by using continuous wave (CW) laser and a coherent detection system [5][6][7][8][9] . The conventional ToF lidars provide a robust ranging methodology by using high peak power laser impulses.…”

Section: Introductionmentioning

confidence: 99%

Single-shot ranging and velocimetry far beyond the coherence length of CW lasers

Bayer

Guentchev

et al. 2021

Preprint

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The spectral linewidth of the continuous-wave (CW) lasers is one of the key limitations on the coherent lidar systems, which defines the maximum detection range. Furthermore, precise phase or frequency sweeping requirements is a deterrent in many applications. Here, we present the Phase-Based Multi-Tone Continuous Wave (PB-MTCW) lidar measurement technique that eliminates the necessity of using high coherence laser sources as well as any form of phase or frequency sweeping while employing coherent detection. In particular, we modulate a CW laser source with multiple radio-frequency (RF) tones to generate optical sidebands. Then we utilize the relative phase variations between the sidebands that are free from laser phase noises to calculate the target distance via post-processing and triangulation algorithms. We prove that the PB-MTCW technique is capable of performing single-shot ranging and velocimetry measurements at more than 500× the coherence length of a CW laser in a benchtop experimental demonstration.

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“…Light detection and ranging (LiDAR) technologies have many applications ranging from scientific researches, industrial manufacturing to robotics and autonomous vehicles [1,2]. Compared to the conventional pulsed time-of-flight method, frequency-modulated continuous-wave (FMCW) technology is able to achieve high resolution without requiring fast electronics or high optical power, and is immune to direct sun light and interference from other LiDAR transmitters, thanks to coherent detection [1,3]. It is also capable of simultaneously detecting target position and velocity in a single measurement through the Doppler frequency shift [4].…”

Section: Introductionmentioning

confidence: 99%

Laser frequency sweep linearization by iterative learning pre-distortion for FMCW LiDAR

2019

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We report on a laser frequency sweep linearization method by iterative learning pre-distortion for frequency-modulated continuous-wave (FMCW) light detection and ranging (LiDAR) systems. A pre-distorted laser drive voltage waveform that results in a linear frequency sweep is obtained by an iterative learning controller, and then applied to the FMCW LiDAR system. We have also derived a fundamental figure of merit for the maximum residual nonlinearity needed to achieve the transform-limited range resolution. This method is experimentally tested using a commercial vertical cavity surface-emitting laser (VCSEL) and a distributed feedback (DFB) laser, achieving less than 0.005% relative residual nonlinearity of frequency sweep. With the proposed method, high-performance FMCW LiDAR systems can be realized without expensive linear lasers, complex linearization setups, or heavy postprocessing.

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Coherent laser ranging for precision imaging through flames

Cited by 53 publications

References 17 publications

Rapid Linear Frequency Swept Frequency-Modulated Continuous Wave Laser Source Using Iterative Pre-Distortion Algorithm

Rapid Linear Frequency Swept Frequency-Modulated Continuous Wave Laser Source Using Iterative Pre-Distortion Algorithm

Single-shot ranging and velocimetry far beyond the coherence length of CW lasers

Laser frequency sweep linearization by iterative learning pre-distortion for FMCW LiDAR

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