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Videos de Conceptos Relacionados

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

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.
Different compounds display unique properties due to their...
IR Spectrometers01:25

IR Spectrometers

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...
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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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Video Experimental Relacionado

Updated: Jul 12, 2026

The Use of High-resolution Infrared Thermography (HRIT) for the Study of Ice Nucleation and Ice Propagation in Plants
09:36

The Use of High-resolution Infrared Thermography (HRIT) for the Study of Ice Nucleation and Ice Propagation in Plants

Published on: May 8, 2015

Seasat es un radiómetro visible e infrarrojo de Seasat.

E P McClain, R A Marks

    Science (New York, N.Y.)
    |June 29, 1979
    PubMed
    Resumen

    Las imágenes del radiómetro visible e infrarrojo (VIRR) de Seasat identifican eficazmente las nubes, la tierra y el agua. Las temperaturas de la superficie del mar derivadas del VIRR coincidían estrechamente con los análisis de la Administración Nacional Oceánica y Atmosférica, mostrando una diferencia de raíz-media cuadrada de +/- 1.7 K.

    Área de la Ciencia:

    • Ciencias de la observación de la Tierra Ciencias de la observación de la Tierra
    • La radiometría es la radiometría.
    • Oceanografía La oceanografía es la oceanografía.

    Sus antecedentes:

    • La teledetección por satélite proporciona datos cruciales para la observación de la Tierra.
    • La misión Seasat utilizó radiómetros avanzados para obtener imágenes de la superficie.
    • Los datos precisos de la temperatura de la superficie del mar (SST) son vitales para los estudios climáticos y meteorológicos.

    Objetivo del estudio:

    • Evaluar la capacidad del radiómetro visible e infrarrojo (VIRR) de Seasat para identificar las características de la superficie.
    • Para comparar estadísticamente las temperaturas de la superficie del mar derivadas del VIRR con las mediciones de superficie establecidas.

    Principales métodos:

    • Análisis de imágenes visuales e infrarrojas del Seasat VIRR.

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  • Comparación estadística utilizando la desviación de la raíz media cuadrada (RMS).
  • Validación con respecto a los análisis de la Administración Nacional Oceánica y Atmosférica (NOAA) basados en mediciones de superficie in situ.

    • Principales resultados:

    • Las imágenes VIRR de Seasat demostraron ser adecuadas para distinguir entre nubes, tierra y agua.
    • Las SST derivadas de VIRR en áreas libres de nubes mostraron un fuerte acuerdo con los análisis de NOAA.
    • La diferencia de RMS entre las SST derivadas del VIRR y las analizadas por la NOAA fue de +/- 1.7 Kelvin.

    Conclusiones:

    • El Seasat VIRR es un instrumento capaz de identificar las principales características de la superficie de la Tierra.
    • Los datos del VIRR proporcionan mediciones fiables de la temperatura de la superficie del mar adecuadas para el análisis científico.
    • Esto valida la utilidad de la radiometría basada en satélites para aplicaciones oceanográficas y meteorológicas.