Results 31 to 40 of about 11,441 (205)

Interferometric distributed sensing system with phase optical time-domain reflectometry

Photonic Sensors, 2016
We demonstrate a distributed optical fiber sensing system based on the Michelson interferometer of the phase sensitive optical time domain reflectometer (φ-OTDR) for acoustic measurement. Phase, amplitude, frequency response, and location information can
Chen Wang, Ying Shang, Xiaohui Liu, Chang Wang, Hongzhong Wang, Gangding Peng   +5 more
doaj   +1 more source

Spectral-domain optical coherence reflectometric sensor for highly sensitive molecular detection [PDF]

, 2007
We describe what we believe to be a novel use of spectral-domain optical coherence reflectometry (SD-OCR) for highly sensitive molecular detection in real time.
Akkin, Arakaki, Brandenburg, Choma, Choma, Chulmin Joo, de Boer, Homola, Johannes F. de Boer, Joo, Leitgeb, Lin, Nassif, Park, Peng, Pierce, Vollmer, Whitesides, Zhao   +18 more
core   +2 more sources

Effect of Cr spacer on structural and magnetic properties of Fe/Gd multilayers [PDF]

, 2018
In this work we analyse the role of a thin Cr spacer between Fe and Gd layers on structure and magnetic properties of a [Fe(35A)/Cr(tCr)/Gd(50A)/Cr(tCr)]x12 superlattice. Samples without the Cr spacer (tCr=0) and with a thin tCr=4A are investigated using
Choi, Y., Drovosekov, A. B., Haskel, D., Keller, T., Khaydukov, Yu. N., Kholin, D. I., Kravtsov, E. A., Kreines, N. M., Manuilovich, E. A., Proglyado, V. V., Ryabukhina, M. V., Savitsky, A. O., Ustinov, V. V.   +12 more
core   +1 more source

Monitoring contamination level on insulator materials under dry condition with a microwave reflectometer [PDF]

, 2016
Current techniques used for monitoring the levels of contamination on high voltage insulators, such as leakage current and infrared, are not effective in dry conditions since they require the surface of the insulator to be wetted by fog, rain or snow. If
Jiang, Y., Judd, M.D., McMeekin, S.G., Nekahi, A., Reid, A.J., Wilson, A.   +5 more
core   +1 more source

A Novel Method of Spectra Processing for Brillouin Optical Time Domain Reflectometry

Fibers, 2020
A new method of Brillouin spectra post-processing, which could be applied in modern distributed optical sensors: Brillouin optical time domain analyzers/reflectometers (BOTDA/BOTDR), has been demonstrated. It operates by means of the correlation analysis
Fedor L. Barkov, Yuri A. Konstantinov, Anton I. Krivosheev   +2 more
doaj   +1 more source

Non-trivial scaling of self-phase modulation and three-photon absorption in III-V photonic crystal waveguides [PDF]

, 2009
We investigate the nonlinear response of photonic crystal waveguides with suppressed two-photon absorption. A moderate decrease of the group velocity (~ c/6 to c/15, a factor of 2.5) results in a dramatic (30x) enhancement of three-photon absorption well
Aitchison, Alfredo De Rossi, Baba, Bansropun, Bhat, Carmon, Chad Husko, Chee Wei Wong, Corcoran, Dadap, Deng, Ding, Engelen, Fabrice Raineri, Foster, Harris, Hau, Huges, Inoue, Johnson, Kang, Krauss, Kubo, Kuramochi, Longdell, Markowicz, McMillan, Monat, Okawachi, Parini, Pelusi, Quynh V. Tran, Sheik-Bahae, Siviloglou, Stegeman, Sylvain Combrié, Topolancik, Tran, Villeneuve, Vlasov, Weidner, Wherrett, Yang   +42 more
core   +1 more source

Characterization of Laser Frequency Stability by Using Phase-Sensitive Optical Time-Domain Reflectometry

Photonics, 2023
A new method to measure laser phase noise and frequency stability based on the phase-sensitive optical time-domain reflectometry is proposed. In this method, the laser under test is utilized in a phase-sensitive optical time-domain reflectometer, which ...
Danil M. Bengalskii, Danil R. Kharasov, Edgard A. Fomiryakov, Sergei P. Nikitin, Oleg E. Nanii, Vladimir N. Treshchikov   +5 more
doaj   +1 more source

Analysis of the applicability of singlemode optical fibers for measurement of deformation with distributed systems BOTDR [PDF]

, 2016
Distributed optical fiber sensors allow monitoring physical effects across the whole cable. The paper presents results obtained from the performed tests and shows that single mode fibers can provide analyses of the deformation changes, when distributed ...
Bednárek, Lukáš, Fajkus, Marcel, Frnda, Jaroslav, Nedoma, Jan, Vašinek, Vladimír   +4 more
core   +2 more sources

Frequency scanned phase sensitive optical time-domain reflectometry interrogation in multimode optical fibers

APL Photonics, 2020
Standard multimode optical fibers normally support transmission over some 100 modes. Large differences in the propagation constant and the spatial distribution of distinct modes degrade the performance of phase-sensitive optical time-domain reflectometry
K. Markiewicz, J. Kaczorowski, Z. Yang, L. Szostkiewicz, A. Dominguez-Lopez, K. Wilczynski, M. Napierala, T. Nasilowski, L. Thévenaz   +8 more
doaj   +1 more source

Interference Fading Mitigation in Coherent $\Phi$-OTDR Based on Subband Phase-Shift Transform

IEEE Photonics Journal, 2023
In this paper, an interference fading mitigation method based on subband phase-shift transform in coherent phase-sensitive optical time-domain reflectometer ($\Phi$-OTDR) is proposed.
Yafeng Cheng, Hanyong Wang, Desheng Li, Ying Qiu, Ming Luo, Xu Zhang, Jing Zhang, Zhichao Wu, Tianye Huang, Xiang Li   +9 more
doaj   +1 more source