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Related Concept Videos

Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Design of an Optical Transparent Absorber and Defect Diagnostics Analysis Based on Near-Field Measurement.

In-Gon Lee1, Young-Joon Yoon2, Kwang-Sik Choi3

  • 1Information and Communication Engineering Department, Kongju National University, Cheonan 31080, Korea.

Sensors (Basel, Switzerland)
|April 30, 2021
PubMed
Summary

A novel transparent radar absorbing structure (RAS) using transparent conductive oxides (TCOs) was developed. A new method effectively detects fabrication defects, ensuring optimal electromagnetic performance for advanced applications.

Keywords:
defect diagnosticsnear-field measurementradar absorbing structuretransparent conductive oxide

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Area of Science:

  • Materials Science
  • Electromagnetics
  • Optoelectronics

Background:

  • Electromagnetic wave interference from cavity resonance and leakage poses challenges.
  • Optical transparent radar absorbing structures (RAS) are needed for applications requiring both transparency and electromagnetic wave absorption.
  • Transparent conductive oxides (TCOs) offer potential for creating such structures due to their high optical transmittance and electrical conductivity.

Purpose of the Study:

  • To design an optical transparent radar absorbing structure (RAS).
  • To develop a procedure for detecting fabrication and operational defects in RAS.
  • To assess the influence of defects on the electromagnetic performance of transparent RAS.

Main Methods:

  • Designed an optical transparent RAS utilizing transparent conductive oxides (TCOs).
  • Constructed a measurement system with an open-ended near-field antenna for defect detection in planar and 3D structures.
  • Derived reflection characteristics using a simplified multiple reflection equation and compared with an equivalent circuit model to predict surface resistance.

Main Results:

  • A defect detection procedure was proposed and validated.
  • Predicted surface resistance values correlated well with measurements from a non-contact sheet resistance meter.
  • The effectiveness of the proposed defect detection method was confirmed through experimental results.

Conclusions:

  • The developed transparent RAS effectively addresses electromagnetic interference.
  • The proposed defect detection method accurately identifies issues in RAS fabrication and operation.
  • This work enables the reliable implementation of transparent radar absorbing structures.