Results 131 to 140 of about 1,583 (160)

Optical frequency domain reflectometry for aerospace applications

SPIE Proceedings, 2017
Optical Frequency Domain Reflectometry (OFDR) is the basis of an emerging high-definition distributed fiber optic sensing (HD-FOS) technique that provides an unprecedented combination of resolution and sensitivity. We examine aerospace applications that benefit from HD-FOS, such as for defect detection, FEA model verification, and structural health ...
Stephen T. Kreger, Osgar John Ohanian, Naman Garg, Matthew A. Castellucci, Dan Kominski, Nur Aida Abdul Rahim, Matthew A. Davis, Noah B. Beaty, James W. Jeans, Emily H. Templeton, J. R. Pedrazzani   +10 more
openaire   +1 more source

Real-Time Optical Frequency-Domain Reflectometry

2007 Conference on Lasers and Electro-Optics (CLEO), 2007
In this paper, we propose and demonstrate an ultrafast optical frequency domain reflectometry system based on real-time optical Fourier-transformation. Interferograms are captured over 50 ns time windows at a 20 MHz repetition rate with a 70 mum depth resolution.
Y. Park, T. -J. Ahn, J.-C. Kieffer, J. Azana   +3 more
openaire   +1 more source

Time-domain slicing optical frequency domain reflectometry

Optics Letters
A time-domain slicing (TDS) optical frequency domain reflectometry is proposed for large strain sensing with better spatial resolution. Compared with the conventional frequency domain slicing (FDS) method, the TDS with a Burg spectrum estimation is capable of enhancing the similarity of a local spectrum under large strain and mostly suppressing the ...
Qing, Bai, Zhen, Shen, Luxuan, Wu, Changshuo, Liang, Yu, Wang, Xin, Liu, Baoquan, Jin   +6 more
openaire   +2 more sources

Optical Frequency Domain Reflectometry with Synthesized Frequency Sweeping Technique

Conference on Lasers and Electro-Optics, 2016
We develop a synthesized frequency sweeping technique to realize high spatial resolution using multiple small range sweeps for OFDR system. The principle of synthesized frequency sweeping is explained in theory and demonstrated by experiment.
Qingwen Liu, Dian Chen, Xinyu Fan, Zuyuan He   +3 more
openaire   +1 more source

Optical correlation-domain reflectometry without optical frequency shifter

Applied Physics Express, 2016
Abstract To achieve distributed reflectivity measurements along an optical fiber, we developed a simplified cost-effective configuration for optical correlation- (or coherence-) domain reflectometry based on a synthesized optical coherence function using sinusoidal modulation.
Makoto Shizuka, Shumpei Shimada, Neisei Hayashi, Yosuke Mizuno, Kentaro Nakamura   +4 more
openaire   +1 more source

Optical Coherence-Domain Reflectometry by Use of Optical Frequency Comb

Conference on Lasers and Electro-Optics 2010, 2010
A novel optical coherence domain reflectometry (OCDR) by use of an optical frequency comb source is proposed and demonstrated with high spatial resolution ( 45 dB), and short measurement time (≤10 s).
Zuyuan He, Hiroshi Takahashi, Kazuo Hotate   +2 more
openaire   +1 more source

Polarization effects in coherent optical frequency-domain reflectometry

IEEE Photonics Technology Letters, 1996
Polarization effects in coherent optical frequency domain reflectometry were evaluated. The use of a polarization average procedure completely eliminated these effects, giving rise to a measurement accuracy of 0.27 dB for an arbitrary polarization vector of the detected signal, without making use of polarization diversity receivers, which are not ...
G. Mussi, P. Stamp, N. Gisin, R. Passy, J.P. von der Weid   +4 more
openaire   +1 more source

Distributed Optical Fiber-Based Dosimetry With Optical Frequency Domain Reflectometry

IEEE Sensors Journal
International ...
Perrot, J., Morana, A., Marin, E., Boukenter, A., Ouerdane, Y., Bertrand, J., Boiron, H., Girard, S.   +7 more
openaire   +2 more sources

High-resolution optical frequency domain reflectometry

Optical Fiber Communication, 1991
Optical time-domain reflectometry (OTDR) is a widespread and commercially successful technique for performing several types of measurements on fiber-optic networks and components. An alternative method, also in widespread use, is optical frequency-domain reflectometry (OFDR).
openaire   +1 more source

Optical frequency domain reflectometry with broadened frequency sweep range assisted by a dual electro-optic frequency comb

Optics Letters, 2023
We propose an optical frequency domain reflectometry (OFDR) with the assistance of a dual electro-optic frequency comb (EOFC), which is intended to improve the system spatial resolution. As the spatial resolution of an OFDR system is inversely proportional to the frequency sweep range, the EOFC acts as a multi-frequency light source for collecting ...
Yidai Zhu, Xinyu Fan, Zhaopeng Zhang, Zhengchao Yuan, Bingxin Xu, Zuyuan He   +5 more
openaire   +3 more sources