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Academic literature on the topic 'Fiber Bragg Grating Pulse Recorder'

Author: Grafiati
Published: 6 September 2023

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Journal articles on the topic "Fiber Bragg Grating Pulse Recorder"

1

Umesh, Sharath, Srivani Padma, Shikha Ambastha, Anand Kalegowda, and Sundarrajan Asokan. "Pulse transit time differential measurement by fiber Bragg grating pulse recorder." Journal of Biomedical Optics 20, no. 5 (2015): 057005. http://dx.doi.org/10.1117/1.jbo.20.5.057005.

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2

Sharath, U., C. Shwetha, K. Anand, and S. Asokan. "Radial arterial compliance measurement by fiber Bragg grating pulse recorder." Journal of Human Hypertension 28, no. 12 (2014): 736–42. http://dx.doi.org/10.1038/jhh.2014.45.

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3

Radzi, Nurnazifah M., Amirah A. Latif, Mohammad F. Ismail, et al. "Tunable Spacing Dual-Wavelength Q-Switched Fiber Laser Based on Tunable FBG Device." Photonics 8, no. 12 (2021): 524. http://dx.doi.org/10.3390/photonics8120524.

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A tunable spacing dual-wavelength Q-switched fiber laser is experimentally demonstrated based on a fiber Bragg grating tunable device incorporated in an erbium-doped fiber laser (EDFL). The system utilizes two identical fiber Bragg gratings (FBGs) at 1547.1 nm origin to enable two laser lines operation. The wavelength separations between two laser lines are controlled by fixing one of the FBGs while applying mechanical stretch and compression to the other one, using a fiber Bragg grating tunable device. The seven steps of wavelength spacing could be tuned from 0.3344 to 0.0469 nm spacing. Pulse characteristics for both close and wide spacing of dual-wavelength Q-switched fiber laser are successfully being recorded. The findings demonstrate the latest idea of dual-wavelength fiber laser based on FBG tunable device, which offers a wide range of future applications.
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4

Kulchin, Yuriy N., Anatoly M. Shalagin, Oleg B. Vitrik, Sergey A. Babin, Anton V. Dyshlyuk, and Alexander A. Vlasov. "Differential Reflectometry of Fiber Bragg Gratings." Key Engineering Materials 437 (May 2010): 324–28. http://dx.doi.org/10.4028/www.scientific.net/kem.437.324.

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A reflectometric approach is proposed for interrogation of multiple fiber Bragg grating (FBG) sensors recorded in a single fiber optic line, based on the differential registration FBGs’ response to a short probing laser pulse using conventional OTDR. A special optical layout has been developed allowing transformation of FBG’s spectrally modulated signals into intensity modulated signals and at the same time eliminating the susceptibility of the system to light power fluctuations. Threshold sensitivity of the method amounted to ~50 μstrain within the measurement range of ~4000 μstrain. The maximum number of FBGs interrogated by the proposed technique is estimated at several hundred, which by far surpasses the requirements of most practical applications. Due to its simplicity, efficiency and usage of conventional OTDR equipment the proposed FBG interrogation technique can find a wide range of applications, in particular in structural health monitoring.
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5

Acharya, Anirudh R., Bram Vandekerckhove, Lars Emil Larsen, et al. "In vivo blue light illumination for optogenetic inhibition: effect on local temperature and excitability of the rat hippocampus." Journal of Neural Engineering 18, no. 6 (2021): 066038. http://dx.doi.org/10.1088/1741-2552/ac3ef4.

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Abstract Objective. The blue light-activated inhibitory opsin, stGtACR2, is gaining prominence as a neuromodulatory tool due its ability to shunt-inhibit neurons and is being frequently used in in vivo experimentation. However, experiments involving stGtACR2 use longer durations of blue light pulses, which inadvertently heat up the local brain tissue and confound experimental results. Therefore, the heating effects of illumination parameters used for in vivo optogenetic inhibition must be evaluated. Approach. To assess blue light (473 nm)-induced heating of the brain, we used a computational model as well as direct temperature measurements using a fiber Bragg grating (FBG). The effects of different light power densities (LPDs) and pulse durations on evoked potentials (EP) recorded from dentate gyrus were assessed. For opsin-negative rats, LPDs between 127 and 636 mW mm−2 and pulse durations between 20 and 5120 ms were tested while for stGtACR2 expressing rats, LPD of 127 mW mm−2 and pulse durations between 20 and 640 ms were tested. Main results. Increasing LPDs and pulse durations logarithmically increased the peak temperature and significantly decreased the population spike (PS) amplitude and latencies of EPs. For a pulse duration of 5120 ms, the tissue temperature increased by 0.6 °C–3.4 °C. All tested LPDs decreased the PS amplitude in opsin-negative rats, but 127 mW mm−2 had comparatively minimal effects and a significant effect of increasing light pulse duration was seen from 320 ms and beyond. This corresponded with an average temperature increase of 0.2 °C–1.1 °C at the recorded site. Compared to opsin-negative rats, illumination in stGtACR2-expressing rats resulted in much greater inhibition of EPs. Significance. Our study demonstrates that light-induced heating of the brain can be accurately measured in vivo using FBG sensors. Such light-induced heating alone can affect neuronal excitability. Useful neuromodulation by the activation of stGtACR2 is still possible while minimizing thermal effects.
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6

Padma, Srivani, Sharath Umesh, Talabattula Srinivas, and Sundarrajan Asokan. "Carotid Arterial Pulse Waveform Measurements Using Fiber Bragg Grating Pulse Probe." IEEE Journal of Biomedical and Health Informatics 22, no. 5 (2018): 1415–20. http://dx.doi.org/10.1109/jbhi.2017.2765701.

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7

Wang, Ming-Xiao, Ping-Xue Li, Yang-Tao Xu, Yun-Chen Zhu, Shun Li, and Chuan-Fei Yao. "An All-Fiberized Chirped Pulse Amplification System Based on Chirped Fiber Bragg Grating Stretcher and Compressor." Chinese Physics Letters 39, no. 2 (2022): 024201. http://dx.doi.org/10.1088/0256-307x/39/2/024201.

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We report an all-fiberized chirped pulse amplification system without any bulk devices. The stretcher and compressor are chirped fiber Bragg gratings inscribed in a 6/125 μm single-mode fiber and a 30/250 μm large-mode-area fiber. The fabrication system of chirped fiber Bragg gratings was designed and built by ourselves. The width of the linear exposure spot was controlled according to the different fiber sizes to improve the fabrication quality, and the parameters of chirped fiber Bragg gratings were fine-tuned during the fabrication to achieve the overall system’s spectral matching. Two fiber circulators with the same fiber sizes as the chirped fiber Bragg gratings were employed to auxiliarily achieve the pulse stretching and compression. The dispersion accumulations provided by the stretcher and compressor are 129.8 ps and 90.8 ps. The power amplifiers were composed of the two-stage 10/130 μm fiber pre-amplifier and the 30/250 μm fiber main amplifier. The proposed chirped pulse amplification system with no spatial light is the true sense of an all-fiberized chirped pulse amplification structure and shows the main trend in development of ultrashort pulse fiber lasers.
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8

Longhi, Stefano. "Klein Tunneling of Light in Fiber Bragg Gratings." Physics Research International 2010 (August 31, 2010): 1–5. http://dx.doi.org/10.1155/2010/645106.

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A photonic analogue of Klein tunneling (KT), that is, of the exotic property of relativistic electrons to pass a large repulsive and sharp potential step, is proposed for pulse propagation in a nonuniform fiber Bragg grating with an embedded chirped region. KT can be simply observed as the opening of a transmission window inside the grating stop band, provided that the impressed chirp is realized over a length of the order of the analogue of the Compton wavelength.
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9

Chen, Xinxin, Enbo Wang, Yali Jiang, et al. "Generalized Resonance Sensor Based on Fiber Bragg Grating." Photonics 8, no. 5 (2021): 156. http://dx.doi.org/10.3390/photonics8050156.

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In response to the difficulty of weak detection of early bearing damage, resonance demodulation technology and the principle of fiber Bragg grating sensing strain were combined to design a fiber Bragg grating generalized resonance sensor, which can extract the weak pulse signal of weak detection of early bearing’s early damage from rolling bearing. First, a principle of resonance dynamics of second-order mechanical systems based on fiber Bragg grating and generalized resonance principles is proposed. Second, the basic structure of the sensor is designed. Then, ANSYS finite element simulation is used to analyze the natural frequency of the sensor. Finally, the natural frequency value of the sensor was obtained through experiments. The experimental results of proof-of-principle show that the experimental results are consistent with the theoretical predictions. The theoretical model is accurate, which verifies the feasibility of the sensor.
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10

Xu, Qinfeng, Qiong Liu, Qing Ye, et al. "Millimeter-wave pulse generation based on pulse reshaping using superstructure fiber Bragg grating." Optik 121, no. 20 (2010): 1853–58. http://dx.doi.org/10.1016/j.ijleo.2009.05.004.

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