scholarly journals Reference-free holographic diversity interferometry via iterative measurements for high accuracy phase detection

2016 ◽  
Vol 24 (21) ◽  
pp. 24739 ◽  
Author(s):  
Yuta Goto ◽  
Atsushi Okamoto ◽  
Yuta Wakayama ◽  
Kazuhisa Ogawa ◽  
Jin Nozawa ◽  
...  
Keyword(s):  
High Accuracy ◽  
Phase Detection

Distributed Fiber Deformation Measurement by High-accuracy Phase Detection in OFDR Scheme

2021 ◽  
pp. 1-1
Author(s):  
Shiyuan Zhao ◽  
Jiwen Cui ◽  
Zhanjun Wu ◽  
Ziyun Wang ◽  
Jiubin Tan
Keyword(s):  
High Accuracy ◽  
Deformation Measurement ◽  
Phase Detection ◽  
Fiber Deformation

scholarly journals High-Accuracy AM-FM Radar with an Active Reflector

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Mun Gak Choi ◽  
Dong Sik Woo ◽  
Hyun Chul Choi ◽  
Kang Wook Kim
Keyword(s):  
Experimental Tests ◽  
High Accuracy ◽  
Phase Detection ◽  
Absolute Distance ◽  
Distance Measurements ◽  
Measured Range ◽  
Narrow Bandwidth ◽  
X Band ◽  
Active Reflector ◽  
Base Module

An amplitude-modulated and frequency-modulated (AM-FM) radar with an active reflector to produce high-accuracy distance measurements is proposed and demonstrated in this paper. The proposed radar consists of an AM-FM base module and an active reflector. The combination of AM and FM modulations resolves ambiguity of the absolute distance in typical AM radars, while improving range accuracy in typical FM radars with narrow bandwidth. Also, the active reflector, which translates the frequency of the received signal, resolves the problem of phase detection interference due to the direct Tx-to-Rx leakage in AM radars. In this paper, the operating principle, experimental tests, and analysis are presented. The implemented AM-FM radar operates in X-band (Tx: 10.5 GHz, Rx: 8.5 GHz) with the 620 MHz bandwidth. The measured range accuracy of less than ±10 mm at a distance of 70 m is obtained.

A New 1,000 kV Electron Microscope

1967 ◽  
Vol 25 ◽  
pp. 260-261
Author(s):  
M. Nishigaki ◽  
S. Katagiri ◽  
H. Kimura ◽  
B. Tadano
Keyword(s):  
Electron Microscope ◽  
High Voltage ◽  
Basic Research ◽  
Chromatic Aberration ◽  
High Accuracy ◽  
Biological Specimen ◽  
Voltage Electron ◽  
High Voltage Electron Microscope ◽  
High Voltage Electron

The high voltage electron microscope has many advantageous features in comparison with the ordinary electron microscope. They are a higher penetrating efficiency of the electron, low chromatic aberration, high accuracy of the selected area diffraction and so on. Thus, the high voltage electron microscope becomes an indispensable instrument for the metallurgical, polymer and biological specimen studies. The application of the instrument involves today not only basic research but routine survey in the various fields. Particularly for the latter purpose, the performance, maintenance and reliability of the microscope should be same as those of commercial ones. The authors completed a 500 kV electron microscope in 1964 and a 1,000 kV one in 1966 taking these points into consideration. The construction of our 1,000 kV electron microscope is described below.

Application Of BIM-Technology In The Restoration Of Buildings

2020 ◽  
pp. 42-48
Keyword(s):  
Chinese Communist Party ◽  
Laser Scanning ◽  
High Accuracy ◽  
Information Environment ◽  
Information Modeling ◽  
Structural Scheme ◽  
Traditional Design ◽  
Information Interaction ◽  
Heritage Buildings ◽  
Effective Organization

The paper describes the main trends in the development of BIM technologies in the field of restoration and reconstruction of historical and cultural heritage buildings. The practical part of the paper presents the experience in using information modeling technologies when restoring the building, where the VI Congress of the Chinese Communist Party in Moscow took place. The use of laser scanning technologies made it possible to reproduce with high accuracy in the information model the original appearance of the building using Autodesk RevitR software. It is shown, how the use of information modeling technologies affects the duration of restoration process, taking into account the calculation of the structural scheme and bearing structures of the building, ensuring the identity of the decoration and the effective organization of electromechanical installation. Operating in a single BIM information environment makes it possible to continuously obtain reliable information on the project, which provides more effective information interaction and communication of participants compared to using traditional design methods.

Sign in / Sign up

Export Citation Format

Share Document