Absolute distance measurement in a combined-dispersive interferometer using a femtosecond pulse laser

Wu, Hanzhong; Zhang, Fumin; Meng, Fanqi; Liu, Tingyang; Li, Jianshuang; Pan, Liang; Qu, Xinghua

doi:10.1088/0957-0233/27/1/015202

Cited by 26 publications

(6 citation statements)

References 32 publications

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“…Since its inception in the late 20th century, the optical frequency comb (OFC), which can provide numerous ultra-narrow linewidth wavelengths over a broad optical spectral range, has been widely used in the areas of optical frequency [ 7 , 8 ], angles [ 9 , 10 , 11 , 12 ], spectroscopy [ 13 ], etc. Furthermore, versatile absolute distance measurement methods have been developed based on the OFC, encompassing synthetic wavelength interferometry (SWI) [ 14 , 15 , 16 ], multi-wavelength interferometry (MWI) [ 17 , 18 , 19 ], dispersive interferometry [ 20 , 21 , 22 ], dual-comb interferometry [ 23 , 24 , 25 ], and time-of-flight (TOF) measurement [ 26 , 27 , 28 , 29 ]. Among these methods, dispersive interferometry, which utilizes the interferogram across a broad spectrum, is distinguished from other methods by its capability of achieving high-resolution distance measurements.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Data-Processing Algorithms for Dispersive Interferometry Using a Femtosecond Laser

Liu,

Matsukuma,

Suzuki

et al. 2024

Sensors

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Dispersive interferometry based on a femtosecond laser is extensively utilized for achieving absolute distance measurements with high accuracy. However, this method cannot measure arbitrary distances without encountering a dead zone, and deviations in its output results are inevitable due to inherent theory limitations. Therefore, two enhanced data-processing algorithms are proposed to improve the accuracy and reduce the dead zone of dispersive interferometry. The principles of the two proposed algorithms, namely the truncated-spectrum algorithm and the high-order-angle algorithm, are proposed after explaining the limitations of conventional methods. A series of simulations were conducted on these algorithms to show the improved accuracy of measurement results and the elimination of the dead zone. Furthermore, an experimental setup based on a dispersive interferometer was established for the application of these proposed algorithms to the experimental interference spectral signals. The results demonstrated that compared with the conventional algorithm, the proposed truncated-spectrum algorithm could reduce the output distance deviations derived from direct inverse Fourier transforming by eight times to reach as low as 1.3 μm. Moreover, the unmeasurable dead zone close to the zero position of the conventional algorithm, i.e., the minimum working distance of a dispersive interferometer, could be shortened to 22 μm with the implementation of the proposed high-order-angle algorithm.

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Section: Introductionmentioning

confidence: 99%

Enhanced Data-Processing Algorithms for Dispersive Interferometry Using a Femtosecond Laser

Liu,

Matsukuma,

Suzuki

et al. 2024

Sensors

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“…Hence, optical path stabilization technology must be adopted for the DOP. Some related research results have been published, and most methods [17,18] introduce an external continuous wave (CW) light source to stabilize the LF. However, additional devices to stabilize CW light source are required and thus complicate the structure of the system.…”

Section: Introductionmentioning

confidence: 99%

Highly stabilized delay optical path with a long fiber toward absolute distance measurement

Gao¹,

Long²,

Jin³

et al. 2022

Meas. Sci. Technol.

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A stabilized delay optical path toward absolute distance measurement is proposed on the basis of the principle of optical balanced cross correlation. An optical balanced cross correlation signal is subtraction from two second harmonics, which are generated by a periodically polarized crystal, when the fundamental frequency pulses pass through periodically polarized crystal twice from the front and back. The steep slope of signal near the zero point is 67 mV/nm and is used to lock the fiber stretcher in the delay optical path by a servo controller, thereby the purpose of stabilizing delay optical path has been completed. The delay optical path is composed of a long fiber with two different applied lengths of ~466 and ~2000 m. The pulse number difference between delay and reference fibers is 227 and 978. The long-term fluctuation of stabilized long fiber is evaluated by cross-correlation measurements, and the long-term repeatability of 1.6 and 2.9 μm has been achieved over 10 minutes. Therefore, this highly stabilized delay optical path can be considered as a stable device of optical path.

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“…In the time domain, the distances can be measured by technique of pulse cross correlation, via the peak positions of the cross-correlation patterns [22][23][24], stationary phase evaluation [19,25], and intensity detection [26]. In the frequency domain, spectral (dispersive) interferometry [27,28] and chirped pulse interferometry [29][30][31] are able to determine the distances through the spectral phases. Please note that a dispersion device is required in the configuration of chirped pulse interferometry.…”

Section: Introductionmentioning

confidence: 99%

Precise underwater distance measurement using laser frequency comb

Xu¹,

Zhao²,

Zhang³

et al. 2021

Metrologia

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Underwater distance measurement has been playing an important role in the fields of underwater navigation, search and rescue, and bathymetric survey. However, limited by the measurement sources (e.g. acoustic pulses or incoherent optical pulses), the precision can only achieve centimeter level at best, which greatly obstructs the advancement of underwater science and technology. Recent developments of optical frequency combs have given rise to revolutionary progress in metrology, spectroscopy, and optical distance measurement in air. However, frequency comb-based underwater distance measurement has rarely been reported. In this work, we describe a spectral interferometry-based method using a laser frequency comb at 518 nm (green light), which is capable of underwater distance measurement with high precision and accuracy. Due to the inherently dispersive characteristic of water, the measurement pulse will be chirped, and the spectrograms exhibit unstable oscillations, the spectral phase of which features a quadratic law. Distances up to 4.4 m and displacements down to 5 μm underwater can be determined by virtue of the spectral phases. The experimental results show the differences within ±4 μm at 4.4 m range, compared to the reference values. The Allan deviation is 1.596 μm at 5 s averaging time, 481 nm at 100 s averaging time, and can achieve 261 nm with 540 s averaging time. Our work could provide a promising and powerful tool for underwater distance measurement with high precision at long range, and open the door to a host of underwater applications related to the measurement of distance, e.g. mapping and positioning.

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Absolute distance measurement in a combined-dispersive interferometer using a femtosecond pulse laser

Cited by 26 publications

References 32 publications

Enhanced Data-Processing Algorithms for Dispersive Interferometry Using a Femtosecond Laser

Enhanced Data-Processing Algorithms for Dispersive Interferometry Using a Femtosecond Laser

Highly stabilized delay optical path with a long fiber toward absolute distance measurement

Precise underwater distance measurement using laser frequency comb

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