scholarly journals Two-dimensional THz reflectometry of a periodic structure obtained by additive technology

2021 ◽  
Vol 2140 (1) ◽  
pp. 012015
Author(s):  
A V Badin ◽  
A I Berdyugin ◽  
V D Moskalenko ◽  
K V Simonova ◽  
R P Gursky
Keyword(s):  
Periodic Structure ◽  
Acrylonitrile Butadiene Styrene ◽  
Additive Technologies ◽  
Positioning System ◽  
Two Dimensional ◽  
Additive Technology ◽  
Backward Wave Oscillator ◽  
Wave Oscillator ◽  
Dimensional Object ◽  
Butadiene Styrene

Abstract This paper considers the development and application of a system of reflectometry for the analysis of the homogeneity of structures manufactured by additive technologies. A system of reflectometry based on a backward wave oscillator, a two-dimensional object positioning system and an optoacoustic detector (Goley cell) is described. The results of reflectometry of the hexagonal periodic structure of cells based on acrylonitrile butadiene styrene at a wavelength of 343 microns are presented.

scholarly journals Terahertz Scanning Reflectometer for Structure Visualization of Polymer Constructions in Additive Manufacturing

2021 ◽  
Vol 5 (3) ◽  
pp. 207-224
Author(s):  
A. I. Berdyugin ◽  
◽  
A. V. Badin ◽  
R. P. Gursky ◽  
E. A. Trofimov ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Electromagnetic Radiation ◽  
Phase Distribution ◽  
Thz Radiation ◽  
Optical Scheme ◽  
Additive Technology ◽  
Backward Wave Oscillator ◽  
Registration System ◽  
Wave Oscillator ◽  
Backward Wave

The results of the development and practical application of a quasi-optical system for reflectometry of objects in the terahertz frequency range for analyzing the structure in additive manufacturing of objects are presented. A backward-wave oscillator is used for continuous generation of electromagnetic radiation; an acousto-optic converter (Golay cell) is applied as a detector. The reflectometer is controlled by personal computer through the L-card E 154 input-output module and the standard digital-to-analog converter of the STD-21 spectrometer. The system is tested at the frequency of 874 GHz on the 3D-printed composite structure sample. Our paper is terahertz reflectometer with a source of continuous monochromatic electromagnetic radiation based on a backward wave oscillator is presented. The purpose of this work in creating a scanning THz reflectometer is considered to have been achieved. At the same time, the following tasks are solved: a quasi-optical scheme of the reflectometer is selected and assembled; the hardware part of the system (all mechanisms and components) is implemented; a program for controlling the radiation intensity registration system is adapted for this task; the test sample is manufactured using 3D printing technology, the THz reflectometer is tested. The obtained practical results of registration of the two-dimensional distribution of the reflection coefficient show that the use of THz radiation is promising for visualizing the structure of structures obtained by additive technology. Further development of the project is planned by changing the construction of the positioning mechanism, which will provide micrometric calibration of the sample holder relative to the diaphragm. The use of the quasi-optical scheme of the two-beam interferometer for recording the phase distribution and amplitude of reflected THz radiation will allow obtaining information about the spatial location of defects (inhomogeneities) of products obtained by additive technology.

A spatially developed coaxial 30-GHz backward wave oscillator with radiation synchronization by a two-dimensional Bragg structure

2013 ◽  
Vol 39 (6) ◽  
pp. 509-513
Author(s):  
N. S. Ginzburg ◽  
V. Yu. Zaslavskii ◽  
E. V. Ilyakov ◽  
I. S. Kulagin ◽  
N. Yu. Peskov ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Bragg Structure ◽  
Backward Wave Oscillator ◽  
Wave Oscillator ◽  
Backward Wave

scholarly journals Research of polymers strength properties for 3D printing under normal conditions

2021 ◽  
Vol 2057 (1) ◽  
pp. 012107
Author(s):  
V V Volkov-Muzylev ◽  
L E Vendland ◽  
Yu A Borisov ◽  
A N Demidov ◽  
N K Fominykh
Keyword(s):  
Carbon Fibers ◽  
Complex Geometry ◽  
Acrylonitrile Butadiene Styrene ◽  
Production Method ◽  
Strength Properties ◽  
Thermoplastic Resin ◽  
Additive Technology ◽  
Instrumental Indentation ◽  
Butadiene Styrene

Abstract An article is devoted to the study of the strength properties of interlayer adhesion and determination of Young's modulus by the ball instrumental indentation method for samples, made of various plastics using additive technology under normal conditions. This production method is chosen as the most appropriate for creating lightly stressed parts of complex geometry (up to 30 MPa) in the shortest possible time. One of the possible options for such products is full-size centrifugal wheels layouts of low power gas turbine units (up to 250 kW) for testing them in model conditions. It will ensure the work of the material in the elastic zone. The samples are considered, obtained by FDM method from various polymers such as: acrylonitrile butadiene styrene thermoplastic resin (ABS+), acrylonitrile butadiene styrene thermoplastic resin with addition of carbon fibers (ABS Carbon), nylon with addition of carbon fibers (Nylon Super Carbon), polyethylene terephthalate glycol (PETG) and a compound based on polylactide (PLA HP). Plastics, made by this method, have anisotropic properties. Therefore, in this work, the strength characteristics of the test samples interlayer adhesion under tension are determined.

scholarly journals The practical application of subwavelength focusing elements in the EHF imaging system

2019 ◽  
Vol 30 ◽  
pp. 12008
Author(s):  
Sergey Zhakupov ◽  
Alexander Badin ◽  
Alexander Berdyugin
Keyword(s):  
Refractive Index ◽  
Electromagnetic Wave ◽  
Electromagnetic Radiation ◽  
Imaging System ◽  
Acrylonitrile Butadiene Styrene ◽  
Additive Technologies ◽  
Practical Application ◽  
Simulation Results ◽  
Focusing Properties ◽  
Butadiene Styrene

This paper presents the results of modeling the processes of interaction of an electromagnetic wave of the EHF range with focusing elements made of materials with a refractive index n in the range from 1.2 to 2. Based on the obtained simulation results using additive technologies, an equilateral parallelepiped of acrylonitrile butadiene styrene with a refractive index was created n = 1.62. After which it was added to the EHF imaging system, and its focusing properties were analyzed. As a result of the experiments, pictures were obtained of the dependence of the intensity of electromagnetic radiation on the surface of test samples on the presence of a given focusing element in the system.

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