Zobrazeno 1 - 10
of 162
pro vyhledávání: '"Neisei Hayashi"'
Publikováno v:
IEEE Photonics Journal, Vol 8, Iss 3, Pp 1-7 (2016)
We experimentally demonstrate the observation of backward (i.e., opposite of the direction of the pump) guided-acoustic-wave Brillouin scattering (GAWBS) using the pump-probe technique and investigate the spectral dependence on the pump-probe light p
Externí odkaz:
https://doaj.org/article/c4bfc67f2ea443338f38035a2c5d90b9
Publikováno v:
IEEE Photonics Journal, Vol 8, Iss 3, Pp 1-7 (2016)
Exploiting the slope of the Brillouin gain spectrum, we develop a new configuration of Brillouin optical correlation-domain reflectometry, which can measure strain (or temperature) and optical loss distributions simultaneously with a high sampling ra
Externí odkaz:
https://doaj.org/article/78147eb4ecd043bc9ead3c9c1eea4c2c
Publikováno v:
IEEE Photonics Journal, Vol 7, Iss 1, Pp 1-7 (2015)
To perform distributed strain and temperature measurement, we have recently developed simplified Brillouin optical correlation-domain reflectometry (S-BOCDR), in which the light that is Fresnel reflected at the ends of the fiber under test (FUT) is u
Externí odkaz:
https://doaj.org/article/33a28a120c1543fcafe8b1b502647bdf
Publikováno v:
IEEE Photonics Journal, Vol 6, Iss 5, Pp 1-7 (2014)
We implement the strain and temperature sensors based on multimode interference in perfluorinated (PF) graded-index (GI) plastic optical fibers, and investigate their sensing performance at 1300 nm. We obtain strain and temperature sensitivities of -
Externí odkaz:
https://doaj.org/article/a85c57655b87431f9bc184d1eb720b4e
Publikováno v:
IEEE Photonics Journal, Vol 6, Iss 5, Pp 1-7 (2014)
We develop a simple and cost-efficient configuration of Brillouin optical correlation-domain reflectometry (BOCDR), the setup of which does not include an additional reference path used in standard BOCDR systems. The Fresnel-reflected light from an o
Externí odkaz:
https://doaj.org/article/c70f401fb7b540198bfb8d43a0f83a53
Publikováno v:
IEEE Photonics Journal, Vol 6, Iss 6, Pp 1-8 (2014)
We developed an alternative configuration of simplified Brillouin optical correlation-domain reflectometry, which can overcome the drawbacks of the original configuration. This system uses, as reference light, the light that is Fresnel reflected at a
Externí odkaz:
https://doaj.org/article/4f73fbb5fc0d4fe08c33299751f9ecc4
Publikováno v:
IEEE Photonics Journal, Vol 6, Iss 3, Pp 1-7 (2014)
We study the propagation behavior of the polymer optical fiber (POF) fuse at a power density up to several tens of $\hbox{kW/cm}^{2}$ (corresponding to subwatt power). The propagation velocity is raised in proportion to the power density, reaching 41
Externí odkaz:
https://doaj.org/article/c73b9e30d8d745ed86ac88b1aa22eac5
Publikováno v:
IEEE Transactions on Instrumentation and Measurement. 69:4496-4506
Laser scanners have emerged as a powerful instrument for high-precision 3-D geometry measurement. However, such attractive laser scanners have failed to address to drop of receiving power due to laser’s interaction with the surface of the object un
In-process measurement of a keyhole using a low-coherence interferometer with a high repetition rate
Autor:
Ryo Nomura, Masakazu Kanamori, Hideaki Furukawa, Takahiro Hashimoto, Takuma Fujita, Katsuhiro Ishii, Takahiro Deguchi, Takeshi Makino, Hiroshi Hasegawa, Naoya Wada, Neisei Hayashi, Masaharu Hoshikawa
Publikováno v:
Optics express. 29(20)
The shape of an instance hole (keyhole) created via a high-power laser was measured using a low-coherence interferometer with the following parameters: repetition rate, 10 MHz; center wavelength, 1550 nm; absolute spatial resolution, 10 µm; and meas
Publikováno v:
Optics and Photonics for Advanced Dimensional Metrology.
Amplitude-modulated continuous-wave laser scanner with focusing optics can realize extremely high-precision 3D measurement. Since amplitude-modulated continuous-wave scheme employs periodical modulation, the longitudinal resolution and the maximum un