A winding machine for polarized wire grid of microwave radiometer calibration

2018 ◽  
Vol 233 (5) ◽  
pp. 1916-1925
Author(s):  
Yong Hu ◽  
Xin Shen ◽  
Ye Hu ◽  
Maosen Wang ◽  
Qichao Zhang ◽  
...  
Keyword(s):  
Structural Analysis ◽  
Microwave Radiometer ◽  
Low Energy ◽  
Wire Grid ◽  
Radiometer Calibration ◽  
Winding Machine ◽  
Parameters Calculation

Polarized wire grid has been used as a low-energy polarization separator in many calibration systems. A novel machine was developed for winding the polarized wire grids with different sizes and shapes. In this paper, the process of design including parameters calculation, structural analysis, and the calibration for the winding device is presented. Finally, taking an oval grid as an example, the fabrication and the testing results is shown. A 250 mm×350 mm oval polarized wire grid is fabricated by using this machine, with 0.1 mm diameter molybdenum wires at the distance of 0.3 ± 0.02 mm. And it achieved the 01. mm flatness requirement. The machine used is robust and can be easily extended to even 200 × 200 mm2 – 500 mm × 500 mm grids with 0.08–0.2 mm diameter wires at the distance of 0.1–0.5 mm.

Filament Winding—Introduction and Overview

2011 ◽  
pp. 1-5
Author(s):  
S.T. Peters
Keyword(s):  
Structural Analysis ◽  
Deep Sea ◽  
High Speed ◽  
Pressure Vessels ◽  
Filament Winding ◽  
Filament Wound ◽  
Machine Control ◽  
Winding Machine

Abstract Most filament winding machines now have computer controls and at least three axes. Winding with four axes is increasingly common because the shapes of the products have evolved to include more complexity. The automation used on the winding machine and ancillary components does not eliminate the need for proper fiber handling. This chapter is a primer on modern filament winding equipment and its use, starting with an overview of machine control and then discussing the design and structural analysis of filament wound components such as pressure vessels, pipes, grid structures, deep sea oil platform drill risers, high-speed rotors, and filament-wound preforms.

Development of the compact low-energy soft x-ray CT instrument for the soft material structural analysis

2008 ◽  
Vol 26 (6) ◽  
pp. 2356-2361 ◽  
Author(s):  
Motosuke Miyoshi ◽  
Takao Hamakubo ◽  
Tatsuhiko Kodama ◽  
Masatoshi Tsuchiya ◽  
Atsushi Koishikawa ◽  
...  
Keyword(s):  
Structural Analysis ◽  
Soft Material ◽  
Low Energy ◽  
X Ray

A New Linearly Polarized Microwave Radiometer Calibration Source

2012 ◽  
Vol 500 ◽  
pp. 341-347
Author(s):  
Xin Biao Wang ◽  
Chang Zeng ◽  
Jing Li ◽  
Jing Shan Jiang
Keyword(s):  
Real Time ◽  
Microwave Radiometer ◽  
Noise Temperature ◽  
Calibration Method ◽  
Calibration Source ◽  
Radiometer Calibration ◽  
Time Calibration ◽  
Linearly Polarized ◽  
Calibration Device

This paper introduces a calibration device for microwave (millimeter and submillimeter) radiometer. The device can provide the microwave radiometer continuously variable linearly polarized noise temperature. The paper also introduces a real-time calibration method to achieve the microwave radiometer calibration, and the test of microwave radiometer sensitivity and linearity.

scholarly journals Finite Element Structural Analysis of a Low Energy Micro Sheet Forming Machine Concept Design

2017 ◽  
Vol 203 ◽  
pp. 012006
Author(s):  
A.R. Razali ◽  
C.T. Ann ◽  
A.F. Ahmad ◽  
H.M. Shariff ◽  
N.I. Kasim ◽  
...  
Keyword(s):  
Finite Element ◽  
Structural Analysis ◽  
Sheet Forming ◽  
Low Energy ◽  
Concept Design

REFINEMENT OF THE Pt(111)+c(4×2)-2CO STRUCTURE USING AUTOMATED TENSOR LEED

2000 ◽  
Vol 07 (01n02) ◽  
pp. 15-19 ◽  
Author(s):  
I. ZASADA ◽  
M. A. VAN HOVE
Keyword(s):  
Structural Analysis ◽  
Electron Diffraction ◽  
Low Energy ◽  
Energy Electron ◽  
Bond Lengths ◽  
Low Energy Electron Diffraction ◽  
Low Energy Electron

The structure of Pt(111)+c(4×2)-2CO has been refined using the powerful capabilities of automated tensor LEED, in particular to determine hitherto-unexplored adsorbate-induced relaxations in the substrate. The refinement considerably improves the fit to experiment obtained in a previous structural analysis performed with low-energy electron diffraction (LEED). This study confirms that CO occupies both top and bridge sites. It finds a buckling of the outermost Pt layer, such that the Pt atoms bonded to CO molecules are raised out of the surface by 0.06±0.04 Å relative to the Pt atoms which do not bond to CO. The raised atoms have a spacing of 2.28±0.04 Å to the next Pt layer, expanded from the bulk spacing of 2.2655 Å, while the depressed Pt atoms have a reduced spacing of 2.22±0.04 Å to the next Pt layer. The second Pt layer itself shows minor buckling of 0.03±0.04 Å. No lateral relaxations in the substrate are detected within 0.1 Å. The CO molecules are perpendicular to the surface, with bond lengths of 1.12±0.04 Å and 1.19±0.04 Å in top and bridge sites, respectively. The C–Pd spacings, measured between bonding atoms, are 1.92±0.04 Å and 1.40±0.04 Å in top and bridge sites, respectively.

Sign in / Sign up

Export Citation Format

Share Document