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Related Concept Videos

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for electronic transitions. As a result...
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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.

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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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3U CubeSat-Based Hyperspectral Remote Sensing by Offner Imaging Hyperspectrometer with Radially-Fastened Primary

Nikolay Ivliev1,2, Vladimir Podlipnov1,2, Maxim Petrov2

  • 1Image Processing Systems Institute NRC "Kurchatov Institute", Molodogvardeyskaya 151, 443001 Samara, Russia.

Sensors (Basel, Switzerland)
|May 11, 2024
PubMed
Summary

A new hyperspectral imaging camera on a 3U CubeSat successfully captured Earth data. This compact system shows strong agreement with Sentinel-2, enabling advanced remote sensing applications.

Keywords:
NDVIdiffraction gratinghyperspectral imagesoptical transfer function (OTF)

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Area of Science:

  • Earth Observation
  • Remote Sensing
  • Astrophysics

Background:

  • Hyperspectral imaging is crucial for Earth observation.
  • CubeSats offer a cost-effective platform for space missions.
  • Previous hyperspectral missions faced limitations in compactness and spectral range.

Purpose of the Study:

  • To present findings from a spaceborne Earth observation experiment using a novel hyperspectral camera on a 3U CubeSat.
  • To evaluate the performance and suitability of the compact hyperspectrometer for remote sensing applications.
  • To demonstrate the CubeSat's capability in generating vegetation indices and unique spectral data.

Main Methods:

  • Utilized an ultra-compact hyperspectral imaging camera with an Offner optical scheme aboard a 3U CubeSat.
  • Captured hyperspectral images with 200 m spatial and 12 nm spectral resolution (400-1000 nm).
  • Conducted numerical simulations for performance evaluation and analyzed a year of orbital data.
  • Compared results with European Space Agency's Sentinel-2 L2A data.

Main Results:

  • The 3U CubeSat successfully acquired hyperspectral data over a year.
  • Generated various vegetation indices, including the normalized difference vegetation index (NDVI).
  • Demonstrated strong agreement with Sentinel-2 L2A data, validating the system's performance.
  • Produced unique index images beyond Sentinel-2 L2A capabilities.

Conclusions:

  • The novel hyperspectral imaging camera on the 3U CubeSat is suitable for Earth observation in the visible and near-infrared spectrums.
  • The compact design and performance confirm its potential for advancing remote sensing applications.
  • The system's ability to generate unique spectral data offers new possibilities for scientific research.