Zobrazeno 1 - 10
of 130
pro vyhledávání: '"Baoquan Jin"'
Publikováno v:
Photonics, Vol 10, Iss 12, p 1362 (2023)
In this paper, a genetic least mean square (GLMS) method is proposed to improve the signal-to-noise ratio (SNR) of acoustic signal reconstruction in a phase-sensitive optical time-domain reflectometry system. The raw demodulated signal is processed v
Externí odkaz:
https://doaj.org/article/1f99b7e80ece4eb0b95cd354e1aa38ca
Publikováno v:
IEEE Access, Vol 9, Pp 41647-41668 (2021)
Optical frequency domain reflectometry (OFDR) is a kind of distributed optical fiber sensors (DOFS) which has attracted an increasing amount of research attention. The OFDR sensor has a high spatial resolution and large dynamic range, which makes it
Externí odkaz:
https://doaj.org/article/72afd39656904b469fb140cede12b5de
Publikováno v:
IEEE Access, Vol 8, Pp 41838-41846 (2020)
The use of intensity-based phase-sensitive optical time-domain reflectometry (φ-OTDR) system to measure low-frequency vibration is the aim of this paper. It is well-known that the laser frequency drift (LFD) and other system noise act as internal vi
Externí odkaz:
https://doaj.org/article/ecdd192503b44c7baab1dc811fa26bac
Autor:
Yu Wang, Pengfei Wang, Kai Ding, Hao Li, Jianguo Zhang, Xin Liu, Qing Bai, Dong Wang, Baoquan Jin
Publikováno v:
IEEE Access, Vol 7, Pp 5886-5895 (2019)
Invasion incident pattern recognition is crucial for a distributed optical fiber vibration sensing system based on a phase-sensitive time-domain reflectometer. Despite traditional pattern recognition identifying the vibration signal, the classificati
Externí odkaz:
https://doaj.org/article/fe8cbdb44df5480c87a6501ba6b20e69
Publikováno v:
IEEE Access, Vol 7, Pp 85821-85837 (2019)
The optical fiber acoustic sensing system is suitable for long-distance monitoring of the acoustic signals generated by the external disturbances. According to the continuity of sensing units, quasi-distributed and distributed optical fiber acoustic
Externí odkaz:
https://doaj.org/article/eb4af0b6af424606b2336a8da41bc8b5
Publikováno v:
Sensors, Vol 22, Iss 3, p 1197 (2022)
In a coherent phase-sensitive optical time-domain reflectometry (Φ-OTDR) sensing system, a frequency shift of hundreds of MHz generated by the pulse modulation of an acoustic optic modulator results in a high central frequency of a beating signal sp
Externí odkaz:
https://doaj.org/article/a27e7641a3d847e1aa89178a4743b15e
Autor:
Qing Bai, Xuan Zheng, Dong Wang, Yu Wang, Xin Liu, Mingjiang Zhang, Hongjuan Zhang, Baoquan Jin
Publikováno v:
IEEE Access, Vol 6, Pp 74828-74835 (2018)
This paper presents a logarithmic detection scheme for reducing the bandwidth of the data acquisition (DAQ) in a Brillouin optical time domain reflectometer (BOTDR). From the analysis of signal features in frequency-scanning BOTDR, the reduction effe
Externí odkaz:
https://doaj.org/article/5848052d106d429fb16e06ed9d35420d
Autor:
Jian Li, Yunting Li, Mingjiang Zhang, Yi Liu, Jianzhong Zhang, Baoqiang Yan, Dong Wang, Baoquan Jin
Publikováno v:
Photonic Sensors, Vol 8, Iss 2, Pp 103-113 (2017)
Abstract In Raman distributed temperature system, the key factor for performance improvement is noise suppression, which seriously affects the sensing distance and temperature accuracy. Therefore, we propose and experimentally demonstrate dynamic noi
Externí odkaz:
https://doaj.org/article/0ca128cb5507446792749f8df539736c
Publikováno v:
IEEE Photonics Journal, Vol 9, Iss 6, Pp 1-7 (2017)
A novel fiber-optic liquid level sensor based on a cross-correlation optical time-domain Fresnel reflection technology is proposed and demonstrated. By processing a single-mode fiber (SMF) to create multiple gaps for generating Fresnel reflections, l
Externí odkaz:
https://doaj.org/article/8a3bad0bb86741b587b79fc6925c1175
Publikováno v:
IEEE Photonics Journal, Vol 8, Iss 1, Pp 1-7 (2016)
This paper reports the realization of a closed-loop feedback system, which consists of a spatial light modulator controlled by the holographic tandem method, for adaptive far-field flattop beam shaping. The holographic tandem method iteratively adjus
Externí odkaz:
https://doaj.org/article/2dec4cbf1be04361bd3763029c74c505