High Temporal and Spatial Resolution Distributed Fiber Bragg Grating Sensors Using Time-Stretch Frequency-Domain Reflectometry

Ahmad, Eamonn J; Wang, Chao; Feng, Dejun; Yan, Zhijun; Zhang, Lin

doi:10.1109/jlt.2016.2605401

Cited by 17 publications

(4 citation statements)

References 30 publications

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“…e sensitivity at the worst point is greatly enhanced, and the ASD noise floor is decreased, thanks to this novel technology [9]. Ahmad et al proposed a novel interrogation technique based on optical time-delay frequency domain reflectometry (OTS-FDR) for a fully distributed linear chi fiber grating (LCFBG) strain sensor with high spatial and temporal resolution and verified it experimentally [10]. However, these methods are not very efficient, time-consuming to implement and apply, and the calculation process is complicated, so they still need to be improved.…”

Section: Introductionmentioning

confidence: 99%

Creation Characteristics of Music Piano Arrangement Based on Distributed Sensors

Cao¹

2022

Mobile Information Systems

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Music piano arrangement is a popular creation method among the public at present, which can play a role in the promotion of traditional culture and the combination of popular culture. However, the traditional method of analyzing the creative characteristics of musical piano arrangements has limitations, and it is not suitable for today’s public review era. In this paper, to address the limitations, distributed sensor technology is employed. It utilizes the Top-k query method, KNN (one of the most basic approaches in data mining classification technology is the proximity algorithm, often known as the K closest neighbor classification algorithm) algorithm, and fused balance algorithm to classify the creative features of musical piano arrangements. It collects 50 classic piano arrangements and studies its compositional style, melody, and tone. The data results showed that, for the style characteristics, each algorithm has a high recognition rate for passion songs, and the three errors are small; for the melody characteristics, because the KNN algorithm has a delay in determining the rising tempo, the overall melody is not grasped correctly, and the Top-k query method is not sensitive to the descending tempo, and the recognition rate is low; for the tonal characteristics, the Top-k query method has a larger range of low-key judgments, so that the number of identifications is larger. As for the energy consumption of the system, as the number of nodes increases, the energy consumption of the three algorithms also increases gradually. Among them, the Top-k query method has the largest energy consumption, exceeding 400 W at 180 nodes, and its energy consumption growth rate continues to increase. The fusion algorithm fluctuates greatly, while the KNN algorithm is stable. This shows that KNN algorithm is more stable in terms of system performance, and its characteristics can be better summarized in the creation and research of piano adaptation.

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Section: Introductionmentioning

confidence: 99%

Creation Characteristics of Music Piano Arrangement Based on Distributed Sensors

Cao¹

2022

Mobile Information Systems

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“…A novel method measures time-of-flight of optical pulse by using electro-optic-sampling-based timing detector (EOS-TD) to compare the timing between femtosecond optical pulse and a frequency-locked periodic electric waveform [16] has been demonstrated recently. In coherent detection, femtosecond laser-based time-stretch technique is another method which has been demonstrated to be feasible, stable and effective in strain measurement [17], [18], ultrafast ranging [19]- [22], imaging [23]-, [25], spectroscopy [26], [27] and microwave photonics applications [28], [29].…”

Section: Introductionmentioning

confidence: 99%

Nanometer Precision Time-Stretch Femtosecond Laser Metrology Using Phase Delay Retrieval

Zhao

Xia

et al. 2021

J. Lightwave Technol.

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A femtosecond laser metrology with nanometer precision and dynamic range of centimeter incorporating time-stretch interferometry and phase delay retrieval method is proposed and experimentally demonstrated. Displacement encoded phase-sensitive temporal interferogram is generated when phase stabilized femtosecond laser pulses transmitting through a time-stretch interferometer. To avoid the chirp of temporal interferogram due to high-order dispersion, time-to-frequency mapping is established to transform the temporal interferogram to the spectral interferogram for high-speed detection. The phase delay of spectral interferogram corresponding to specific displacements is retrieved and accumulated for linear fitting. The fitted slope is the time delay between two arms in the interferometer therefore displacement can be calculated. For precision verification, the preset displacements are measured. Mean error and standard deviation are presented after sliding average of measured results in 4 μs.

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“…The strain information is encoded into the wavelength-dependent reflection spectral range. To interrogate the reflection spectrum, an optical spectrum analyzer [5], Fabry-Perot filter [6], microwave photonic filter [7], and time-stretch frequency-domain reflectometry [8] have been used. However, the performances of these interrogation techniques are limited by either the lack of spatial resolution or high-speed data acquisition requirement.…”

Section: Introductionmentioning

confidence: 99%

High-sensitivity, high-spatial-resolution distributed strain sensing based on a poly(methyl methacrylate) chirped fiber Bragg grating

et al. 2020

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In this study, a high-sensitivity, high-spatial-resolution distributed strain-sensing approach based on a poly(methyl methacrylate) chirped fiber Bragg grating (CFBG) is proposed and experimentally demonstrated. Linearly chirped FBGs in a polymer optical fiber provide an alternative to the silica fiber owing to the lower Young’s modulus, which can yield a higher stress sensitivity under the same external force. According to the spatial wavelength-encoded characteristic of the CFBG, a fully distributed strain measurement can be achieved by optical frequency-domain reflectometry. Through time-/space-resolved short-time Fourier transform, the applied force can be located by the beat frequency originated from the space-induced time delay and measured by the differential frequency offset originated from the strain-induced dispersion time delay. In a proof-of-concept experiment, a high spatial resolution of 1 mm over a gauge length of 40 mm and a strain resolution of 0.491 Hz/με were achieved.

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High Temporal and Spatial Resolution Distributed Fiber Bragg Grating Sensors Using Time-Stretch Frequency-Domain Reflectometry

Abstract: The version in the Kent Academic Repository may differ from the final published version. Users are advised to check http://kar.kent.ac.uk for the status of the paper. Users should always cite the published version of record.

Cited by 17 publications

References 30 publications

Creation Characteristics of Music Piano Arrangement Based on Distributed Sensors

Creation Characteristics of Music Piano Arrangement Based on Distributed Sensors

Nanometer Precision Time-Stretch Femtosecond Laser Metrology Using Phase Delay Retrieval

High-sensitivity, high-spatial-resolution distributed strain sensing based on a poly(methyl methacrylate) chirped fiber Bragg grating

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