Zobrazeno 1 - 10
of 21
pro vyhledávání: '"Ken Hagimoto"'
Publikováno v:
Metrologia. 59:035004
We report the first uncertainty evaluation of NMIJ-F2, the second atomic fountain primary frequency standard at the National Metrology Institute of Japan. To improve the frequency stability, we increase the number of detected atoms to 9 × 105 using
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d2aa7628000dd1aa207161823eb2ceb0
https://doi.org/10.1088/1681-7575/ac5e7b
https://doi.org/10.1088/1681-7575/ac5e7b
Publikováno v:
2018 European Frequency and Time Forum (EFTF).
For our cesium fountain primary frequency standard, NMIJ-F2, uncertainty for most of the dominant physical effects such as the second-order Zeeman shift, the blackbody radiation shift, and the collisional shift has been evaluated. As for the microwav
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f8c0957e417f440d7fe637c5a7c5e615
https://doi.org/10.1109/eftf.2018.8409006
https://doi.org/10.1109/eftf.2018.8409006
Autor:
Ken-ichi Watabe, Shinya Yanagimachi, John G. Hartnett, Ken Hagimoto, Takeshi Ikegami, Takehiko Tanabe, Akifumi Takamizawa, Iku Hirano
Publikováno v:
IEEE Transactions on Instrumentation and Measurement. 64:2504-2512
We describe the preliminary evaluation of the frequency corrections and their uncertainty in the cesium fountain primary frequency standard (PFS) NMIJ-F2 under development at National Metrology Institute of Japan (NMIJ). In NMIJ-F2, cold atoms genera
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::82e8d4f1607710a4fad9b7abf9048ffd
https://doi.org/10.1109/tim.2015.2415015
https://doi.org/10.1109/tim.2015.2415015
Autor:
Shinya Yanagimachi, Ken-ichi Watabe, Akifumi Takamizawa, John G. Hartnett, Takehiko Tanabe, Takeshi Ikegami, Iku Hirano, Ken Hagimoto
Publikováno v:
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. 61:1463-1469
The frequency stability of an atomic fountain clock was significantly improved by employing an ultra-stable local oscillator and increasing the number of atoms detected after the Ramsey interrogation, resulting in a measured Allan deviation of 8.3 ×
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::967c8a9e0b21c59d560e2c8c619a12d2
https://doi.org/10.1109/tuffc.2014.3060
https://doi.org/10.1109/tuffc.2014.3060
Publikováno v:
IEEE Transactions on Instrumentation and Measurement. 57:2212-2217
The largest source of uncertainty of the optically pumped cesium (Cs) frequency standard (NRLM-4), i.e., the distributed cavity phase shift, was reduced by replacing the microwave cavity with a new ring-type one. An H-bend-type ring cavity is adopted
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::570a3e14f56f0b1279028c56aaa7d32c
https://doi.org/10.1109/tim.2008.922086
https://doi.org/10.1109/tim.2008.922086
Autor:
Ken Hagimoto, Ken-ichi Watabe, Iku Hirano, Takehiko Tanabe, Shinya Yanagimachi, Akifumi Takamizawa, Takeshi Ikegami, John G. Hartnett
Publikováno v:
2014 European Frequency and Time Forum (EFTF).
We have made much progress on NMIJ-F2, which is our second cesium fountain frequency standard aiming an uncertainty of < 1×10−15 as an immediate goal. The frequency stability is improved to 8.3×10−14τ−1/2 (τ: averaging time) by applying a c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::31e739e3eb472c01228e7b4e32a9e484
https://doi.org/10.1109/eftf.2014.7331518
https://doi.org/10.1109/eftf.2014.7331518
Autor:
H. Yukawa, M.A. Lawn, Y. Nakadan, Kuniyasu Imamura, Y. Shibuya, Ken Hagimoto, Li Zhigang, Mizuhiko Hosokawa, Noriyuki Kurihara, M. Imae, P.T.H. Fisk, Li Huanxin
Publikováno v:
IEEE Transactions on Instrumentation and Measurement. 50:559-562
A two-way satellite time and frequency transfer (TWSTFT) network in the Pacific Rim region is under construction to contribute to the calculation of the international atomic time (TAI). Four major time and frequency institutes in this region have bee
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c63997a3c4156f08387a386970056ee0
https://doi.org/10.1109/19.918191
https://doi.org/10.1109/19.918191
Autor:
Ken HAGIMOTO
Publikováno v:
Journal of the Japan Society for Precision Engineering. 66:1679-1683
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9d165952f2ae7e2080c1e5fcf022d5f3
https://doi.org/10.2493/jjspe.66.1679
https://doi.org/10.2493/jjspe.66.1679
Publikováno v:
IEEJ Transactions on Electronics, Information and Systems. 119:821-825
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9e163b7eb88b00474974699aa0a96bfe
https://doi.org/10.1541/ieejeiss1987.119.7_821
https://doi.org/10.1541/ieejeiss1987.119.7_821
Publikováno v:
2013 Joint European Frequency and Time Forum & International Frequency Control Symposium (EFTF/IFC).
Simplified Dual-Mixer Time-Difference Measurement system is proposed using discrete Fourier transformation (DFT) where no sinusoidal-pulsed converter, nor zero-cross detector are necessary. The phase meter integrating the proposed method with a dead
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6d0cbef413e2ee4c0b6ac15009623b76
https://doi.org/10.1109/eftf-ifc.2013.6702142
https://doi.org/10.1109/eftf-ifc.2013.6702142