Precision phase calibrator

1983 ◽  
Vol 26 (5) ◽  
pp. 400-403
Author(s):  
V. M. Sapel'nikov ◽  
A. M. Muftakhov ◽  
N. A. Ishinbaev
Keyword(s):  
Phase Calibrator ◽  
Precision Phase

A simple precision phase calibrator

1975 ◽  
Vol 8 (3) ◽  
pp. 237-241
Author(s):  
M. Baker ◽  
M.J. Boden
Keyword(s):  
Phase Calibrator ◽  
Precision Phase

Study on ultra-precision phase synchronization technique employing phase-locked loop

2021 ◽  
Vol 17 (3) ◽  
pp. 134-139
Author(s):  
Wan-peng Zhang ◽  
Hong Wu ◽  
Wei-feng Zhou ◽  
Ying-xin Zhao ◽  
Zhi-yang Liu ◽  
...  
Keyword(s):  
Phase Synchronization ◽  
Phase Locked Loop ◽  
Precision Phase ◽  
Ultra Precision

Precision Phase-Transfer in Estrogen Receptor Assay Using a "Slurper" Device

1982 ◽  
Vol 13 (4) ◽  
pp. 241-241
Author(s):  
Ranadhir Mitra
Keyword(s):  
Estrogen Receptor ◽  
Phase Transfer ◽  
Receptor Assay ◽  
Precision Phase

High-precision phase-shifting interferometry with spherical wavefront reference

2012 ◽  
Vol 52 (1) ◽  
pp. A188 ◽  
Author(s):  
Xianfeng Xu ◽  
Guangcan Lu ◽  
Yanjie Tian ◽  
Guoxia Han ◽  
Hongguang Yuan ◽  
...  
Keyword(s):  
High Precision ◽  
Phase Shifting ◽  
Phase Shifting Interferometry ◽  
Precision Phase ◽  
Spherical Wavefront

Measurement Errors in 632.8 nm High Precision Phase-Shifting Fizeau Interferometer

2010 ◽  
Vol 47 (4) ◽  
pp. 041202
Author(s):  
魏豪明 Wei Haoming ◽  
邢廷文 Xing Tingwen ◽  
李云 Li Yun ◽  
刘志祥 Liu Zhixiang
Keyword(s):  
High Precision ◽  
Measurement Errors ◽  
Phase Shifting ◽  
Fizeau Interferometer ◽  
Precision Phase

A high precision phase reconstruction algorithm for multi-laser guide stars adaptive optics

2016 ◽  
Vol 25 (9) ◽  
pp. 094214 ◽  
Author(s):  
Bin He ◽  
Li-Fa Hu ◽  
Da-Yu Li ◽  
Huan-Yu Xu ◽  
Xing-Yun Zhang ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
High Precision ◽  
Reconstruction Algorithm ◽  
Phase Reconstruction ◽  
Laser Guide Stars ◽  
Precision Phase ◽  
Laser Guide

scholarly journals Core-shifts and proper-motion constraints in the S5 polar cap sample at the 15 and 43 GHz bands

2018 ◽  
Vol 614 ◽  
pp. A74 ◽  
Author(s):  
F. J. Abellán ◽  
I. Martí-Vidal ◽  
J. M. Marcaide ◽  
J. C. Guirado
Keyword(s):  
Active Galactic Nuclei ◽  
Very Long Baseline Interferometry ◽  
Galactic Nuclei ◽  
Polar Cap ◽  
Motion Constraints ◽  
The Core ◽  
Long Baseline ◽  
Precision Phase ◽  
First Time ◽  
Core Shift

We have studied a complete radio sample of active galactic nuclei with the very-long-baseline-interferometry (VLBI) technique and for the first time successfully obtained high-precision phase-delay astrometry at Q band (43 GHz) from observations acquired in 2010. We have compared our astrometric results with those obtained with the same technique at U band (15 GHz) from data collected in 2000. The differences in source separations among all the source pairs observed in common at the two epochs are compatible at the 1σ level between U and Q bands. With the benefit of quasi-simultaneous U and Q band observations in 2010, we have studied chromatic effects (core-shift) at the radio source cores with three different methods. The magnitudes of the core-shifts are of the same order (about 0.1 mas) for all methods. However, some discrepancies arise in the orientation of the core-shifts determined through the different methods. In some cases these discrepancies are due to insufficient signal for the method used. In others, the discrepancies reflect assumptions of the methods and could be explained by curvatures in the jets and departures from conical jets.

Research on Control Precision of the Neutron Bandwidth Chopper

2012 ◽  
Vol 220-223 ◽  
pp. 1077-1083 ◽  
Author(s):  
Li Ru Zhao ◽  
Xiao Zhang Zhang ◽  
Kai Zhang ◽  
Tong Zhang
Keyword(s):  
Dynamic Balance ◽  
Tracking Error ◽  
Pulse Signal ◽  
Phase Tracking ◽  
Control Precision ◽  
Technical Requirements ◽  
Control Scheme ◽  
Precision Phase ◽  
Synchronous Pulse ◽  
Control Accuracy

Operation of neutron bandwidth limiting chopper requires high controlling precision. Phase difference between the chopper rotor and the synchronous pulse signal should be maintained to be fixed. Rotating frequency of the rotor needs to be very stable. To achieve the above technical requirements, control scheme, dynamic balance, and other means are made. Thus influences to control accuracy are effectively reduced, which are from rotor asymmetry and neutron absorbing materials. In the case described in this paper, phase tracking error was controlled under ±0.10752°with 90% confidence for the designed chopper.

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