An Optical Frequency Domain Angle Measurement Method Based on Second Harmonic Generation

Astuti, Wijayanti Dwi; Matsukuma, Hiraku; Nakao, Minoru; Li, Kuangyi; Shimizu, Yuki; Gao, Wei

doi:10.3390/s21020670

Cited by 15 publications

(14 citation statements)

References 41 publications

(49 reference statements)

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“…Input shaping is a technique that was state-of-the-art in the 1990's when the topic of flexible space robotics last saw a zenith where the method of time-delay was applied to the control signal, and the topic remains an active area of research. [54][55][56] The topic is considered citable and well-known in the context [57] and described here in just-enough detail to understand attempts to repeat this manuscript's research. Figure 14 illustrates the technique accompanied by a key quote cited at [58].…”

Section: Input-shapingmentioning

confidence: 99%

Flattening the Curve of Flexible Space Robotics

Sands¹

2022

Preprint

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Infrastructure monitoring, inspection, repair, and replacement in space is crucial for continued usage and safety, yet it is expensive, time-consuming, and technical very challenging. New robotics technologies and artificial intelligence algorithms are potentially novel approaches that may alleviate such demanding operations using existing or novel sensing technologies. Space structures must necessarily be very light weight due to high costs of placing robots in space. Several methods are proposed and compared to control highly flexible space robotics, where a key challenge is the presence of flexible resonant modes at frequencies so low as to reside inside typical feedback controller bandwidths. Such conditions imply the very action of sending control signals to the ultra-light weight robotics will cause structural resonance. Implementations of incrementally increasing order are offered, achieving over ninety percent performance improvement in trajectory tracking errors, while improvement using unshaped methods merely achieve twenty-four percent improvement in direct comparison (where the only modification is the proposed control methodology). Based on superior performance, single-sinusoidal trajectory shaping is recommended with a corollary benefit of preparing future research into applying deterministic artificial intelligence whose current instantiation relies on single-sinusoidal, autonomous trajectory generation.

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Section: Input-shapingmentioning

confidence: 99%

Flattening the Curve of Flexible Space Robotics

Sands¹

2022

Preprint

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“…Moreover, the phase shift information repeats every fringe, making it difficult to implement measurements beyond λ/2 because the unknown integer fringe order cannot be determined by the Michelson Interferometer itself [4,5]. Since its invention in the end of the 20th century [6][7][8], the optical frequency comb (OFC) has been widely employed to broaden the horizon for optical metrology, including measurement of optical frequency [9][10][11], distance [12][13][14][15][16], angle [17][18][19][20][21][22], and etc. An optical frequency comb (OFC), which provides numerous ultra-narrow linewidth wavelengths over a broad optical spectral range, is the Fourier transform of femtosecond ultrashort pulses from a mode-locked laser in the time domain.…”

Section: Introductionmentioning

confidence: 99%

Improved Algorithms of Data Processing for Dispersive Interferometry using Optical Frequency Comb

Liu¹,

Wu²,

Suzuki³

et al. 2023

Preprint

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Two algorithms of data processing are proposed to shorten the unmeasurable dead-zone close to the zero-position of measurement, i.e., the minimum working distance of a dispersive interferometer using optical frequency comb, which is a critical issue in millimeter-order short-range absolute distance measurement. After demonstrating the limitation of the conventional data processing algorithm, the principles of the proposed algorithms, namely the spectral fringe algorithm, and the combined algorithm that combines the spectral fringe algorithm with the excess fraction method, are presented, together with simulation results for demonstrating the possibility of the proposed algorithms for shortening the dead-zone with a high accuracy. An experimental setup of dispersive interferometer is also constructed for implementing the proposed data processing algorithms over spectral interference signals. Experimental results demonstrate that the dead-zone by the proposed algorithms can be as small as half of that by the conventional algorithm while the measurement accuracy can be further improved with the combined algorithm.

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“…Moreover, the phase shift information repeats every fringe, making it difficult to implement measurements beyond λ/2 because the unknown integer fringe order cannot be determined using the Michelson interferometer itself [ 4 , 5 ]. Since its invention at the end of the 20th century [ 6 , 7 , 8 ], the optical frequency comb (OFC) has been widely employed to broaden the horizon for optical metrology, including measurement of optical frequency [ 9 , 10 , 11 ], distance [ 12 , 13 , 14 , 15 , 16 ], angle [ 17 , 18 , 19 , 20 , 21 , 22 ], etc. An optical frequency comb (OFC), which provides numerous ultra-narrow linewidth wavelengths over a broad optical spectral range, is the Fourier transform of femtosecond ultrashort pulses from a mode-locked laser in the time-domain.…”

Section: Introductionmentioning

confidence: 99%

Improved Algorithms of Data Processing for Dispersive Interferometry Using a Femtosecond Laser

Liu

Suzuki

et al. 2023

Sensors

Self Cite

View full text Add to dashboard Cite

Two algorithms of data processing are proposed to shorten the unmeasurable dead-zone close to the zero-position of measurement, i.e., the minimum working distance of a dispersive interferometer using a femtosecond laser, which is a critical issue in millimeter-order short-range absolute distance measurement. After demonstrating the limitation of the conventional data processing algorithm, the principles of the proposed algorithms, namely the spectral fringe algorithm and the combined algorithm that combines the spectral fringe algorithm with the excess fraction method, are presented, together with simulation results for demonstrating the possibility of the proposed algorithms for shortening the dead-zone with high accuracy. An experimental setup of a dispersive interferometer is also constructed for implementing the proposed data processing algorithms over spectral interference signals. Experimental results demonstrate that the dead-zone using the proposed algorithms can be as small as half of that of the conventional algorithm while measurement accuracy can be further improved using the combined algorithm.

show abstract

An Optical Frequency Domain Angle Measurement Method Based on Second Harmonic Generation

Cited by 15 publications

References 41 publications

Flattening the Curve of Flexible Space Robotics

Flattening the Curve of Flexible Space Robotics

Improved Algorithms of Data Processing for Dispersive Interferometry using Optical Frequency Comb

Improved Algorithms of Data Processing for Dispersive Interferometry Using a Femtosecond Laser

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