Chunfu Cheng

Hubei University of Technology

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Yiwen Ou

Hubei University of Technology

Hui Lv

Hubei University of Technology

Hui Lv

Hubei University of Technology

Qinghua Lv

Hubei University of Technology

Jiaxuan Chen

Harbin Institute of Technology

Zehao Chen

Jiangnan University

Zhangyong Yang

Hubei University of Technology

Yuanchang Zhu

Hubei University of Technology

Wenlong Xiao

Zhejiang Academy of Medical Sciences

Zuozhun Xie

Hubei University of Technology

Cooperative Institutions

Hubei University of Technology

Chinese Academy of Sciences

Wuhan University of Technology

Shanghai Institute of Optics and Fine Mechanics

Huazhong University of Science and Technology

University of Chinese Academy of Sciences

University of Science and Technology of China

Harbin Institute of Technology

Shanghai Jiao Tong University

Central South University

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Multipoint Fiber Loop Ringdown Sensors for Large Strain Measurement Using Frequency-Shifted Interferometry

Sensors (2019)

Chunfu Cheng Zehao Chen Yiwen Ou Jiaxuan Chen

A novel multipoint fiber loop ringdown (FLRD) strain sensing system using frequency-shifted interferometry (FSI) is proposed and experimentally validated. Compared to conventional multipoint FLRD techniques, this scheme measures the decay rate of the continuous wave (CW) light in the space domain and thus greatly reduces the cost without the requirement of expensive devices. A serial dual-point strain sensing system was experimentally constructed and a biconical tapered multimode fiber (MMF) as the sensor head was used for obtaining the large measuring range. By applying different strains on the sensor heads through translation stages, a linear response between strain and additional loss induced by strain sensor was obtained, and the static strain sensitivities of 0.13676 dB/mε and 0.19665 dB/mε were achieved, corresponding to the detection limit of 0.0123 dB and 0.0360 dB, respectively. Moreover, a large measuring range of approximately 6 mε was achieved for both strain sensors. The experimental results indicate that our proposed method offers a promising multipoint strain sensor which has the advantages of low cost, a simple sensing structure and a large measuring range.

Strain (injury)

10.3390/s19132907

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Citations (6)

Synchronous Reflectivity Measurement of a Weak Fiber Bragg Grating Array Using Frequency-Shifted Interferometry

IEEE photonics journal (2017)

Yiwen Ou Chunfu Cheng Ciming Zhou Hui Lv Zhangyong Yang

We demonstrate a method of reflectivity measurement for a weak fiber Bragg grating (FBG) sensor array based on frequency shifted interferometry. In the scheme, the measured weak FBG sensor array was connected after a referenced weak FBG, by using frequency shifted interferometry, the reflectivity of the referenced FBG and the reflection amplitude spectrum of each FBG from the sensor array were obtained, respectively, and then each grating reflectivity was iteratively calculated by using the spectral shadowing removal method. A sensor array of 60-weak FBGs with an average peak reflectivity around -25 dB was experimentally investigated. The obtained peak reflectivity ranged from -37.7 to -21.7 dB with an average value of -26.0 dB. Error analysis indicates the average reflectivity measurement stability for all FBGs was ±1.93 dB. The results reveal that this paper presents a feasible, simple, and low-cost method of reflectivity measurement for large-scale weak FBG sensor arrays.

Fiber Bragg Grating

Reflection

10.1109/jphot.2017.2783343

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Citations (3)

Tracking control and output power optimization of a concentrator photovoltaic system with polar axis

Optik (2016)

Hui Lv Zheng You Jinfang Wang Benyuan Chen Fei Sheng

Tracking (education)

Concentrator

Maximization

Tracking error

Tracking system

10.1016/j.ijleo.2016.01.092

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Citations (13)

Effect of temperature on frequency-shifted interferometry fiber loop ring-down magnetic field sensing system

AOPC 2020: Optical Sensing and Imaging Technology (2020)

Jiaxuan Chen Chunfu Cheng Yiwen Ou Wenjia Chen Hui Lv

A fiber loop ring-down (FLRD) magnetic field sensing system combined with frequency-shifted interferometry (FSI) was proposed and the effect of temperature on its performance was experimentally demonstrated. The FSI-FLRD technique measures the light intensity decay rate (called the ring-down distance) in the space domain instead of in the time domain. Compared with conventional time domain FLRD scheme, FSI-FLRD technique greatly reduces the cost due to only need of inexpensive continuous-wave laser and slow detection. The tapered single mode fiber surrounded by magnetic fluid (MF) was utilized to construct the sensor head for temperature measurement. Different temperature was generated due to the thermal effect of MF and the temperature was obtained by measuring the ring-down distance. The experimental results indicated that a sensitivity of 0.31 /(mm·°C) was achieved.

10.1117/12.2574607

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Citations (2)

Temperature-dependent model of concentrator photovoltaic modules combining optical elements and III–V multi-junction solar cells

Solar Energy (2015)

Hui Lv Fei Sheng Jinmei Dai Wen Liu Chunfu Cheng

Datasheet

Zemax

Concentrator

Solar simulator

Open-circuit voltage

10.1016/j.solener.2014.12.005

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Citations (30)

Extended depth of field with the optimal ‘0, π’ binary phase pupil mask

Journal of Modern Optics (2013)

Qinghua Lv Xiao Zhu Zhongbao Xu Zhongsheng Zhai Chunfu Cheng

A ‘0, π’ phase pupil mask was developed to extend the depth of the field of a circularly symmetric optical imaging system. A global search algorithm was used to seek an optimal pupil mask which provides the largest spatial frequency band in a certain desired contrast value. The modulation transfer function curves and the normalized point spread function figures of the imaging system with the optimal mask were analyzed. The results show that the imaging system has a high resolution in a long frequency band and can obtain clear images without any post-processing. The experimental results also demonstrate that the depth of field of the imaging system is extended sixfold successfully.

Optical transfer function

Depth of field

Point spread function

Pupil function

Spatial frequency

Exit pupil

Entrance pupil

10.1080/09500340.2013.796013

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Citations (2)

Fiber Loop Ring-Down Magnetic Field Sensor Using Frequency-Shifted Interferometry and D-Shaped Fiber Coated With Magnetic Fluid

IEEE Magnetics Letters (2021)

Chunfu Cheng Jiaxuan Chen Yiwen Ou Wen-jia Chen Fang Li

In this letter, we demonstrate a low-cost fiber loop ring-down (FLRD) magnetic field sensor using frequency-shifted interferometry. A D-shaped fiber coated with magnetic fluid was used as the sensor head for enhancing the sensitivity and improving the stability. With this scheme, the magnetic field was sensed in the space domain by measuring the ring-down distance, and its measurement accuracy was improved by introducing a temperature controller. The experimental results showed that a sensitivity of 2.53 × 10 ^-3 (km ^-1 ċG ^-1 ) was achieved, and a stability of 0.146% was obtained, which is better than those of the current time-domain FLRD sensors based on evanescent field effect.

10.1109/lmag.2021.3067592

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Citations (6)

Flatly Broadened and Highly Coherent Supercontinuum Generation by Induced Modulation Instability in ANDi-PCF

Journal of Applied Mathematics and Physics (2018)

Chunfu Cheng Yan Zeng Yiwen Ou Zhangyong Yang Zehao Chen

In this paper, a flatly broadened and highly coherent supercontinuum generation by induced modulation instability in ANDi-PCF is proposed. The numerical results show that the bandwidth of supercontinuun can be increased by increasing the modulation depth and the coherence property of supercontinuum can be improved with the optimal modulation frequency. A highly coherent supercontinuum with the 10 dB bandwidth of 1305 nm and the flatness of less than 10 dB can be obtained when seeding at the modulation depth of 0.3 and modulation frequency of 24 THz.

Supercontinuum

Modulation (music)

10.4236/jamp.2018.64056

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Citations (0)

Effect of initial frequency chirp on the supercontinuum generation in all-normal dispersion photonic crystal fibers

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2011)

Chunfu Cheng Youqing Wang Qinghua Lv

The effect of initial frequency chirp of input pulses on pulse dynamics and spectral broadening in all-normal dispersion photonic crystal fibers are investigated numerically. When the input peak power is low, for small initial frequency chirp the positive chirps can enhance the bandwidth of supercontinuum while the negative chirps can compress the spectrum. When the initial frequency chirp increases the bandwidth of supercontinuum can be further increased and the spectral broadening is similar for both signs of the initial frequency chirp. Especially, the simulations show that there exists an optimal chirp value that makes the supercontinuum flattest almost without the fine spectral structures. For high input peak power the initial frequency chirps have a little effect on the supercontinuum generation and the significant fine spectral structures appear which makes the coherence of supercontinuum become worse. In addition, the effects of input pulse parameters such as peak power, pulse duration and central wavelength on the supercontinuum generation have also been investigated. It is found that the broadest spectra can be obtained when central wavelength of pump pulse located near the maximum of the fiber dispersion curve.

Supercontinuum

Chirp

Chirp spread spectrum

10.1117/12.916956

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Citations (3)

Effect of Coupler Splitting Ratio on Frequency-Shifted Interferometry Fiber Loop Ring-Down Gas Sensing System

Advanced Photonics 2018 (BGPP, IPR, NP, NOMA, Sensors, Networks, SPPCom, SOF) (2018)

Zhangyong Yang Chunfu Cheng Yiwen Ou Zehao Chen Hui Lv

The effect of coupler splitting ratio (CSR) on the performance of frequency-shifted interferometry fiber loop ring-down (FSI-FLRD) gas sensing system is theoretically and experimentally investigated. There exists an optimal CSR for improving the measurement accuracy.

10.1364/sensors.2018.seth1e.6

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Citations (3)