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Related Concept Videos

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...
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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.
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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...
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
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Atomic Absorption Spectroscopy: Interference

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Infrared lidar overlap function: an experimental determination.

Juan Luis Guerrero-Rascado1, Maria João Costa, Daniele Bortoli

  • 1Évora Geophysics Centre (CGE), University of Evora, Evora, Portugal. jrascado@uevora.pt

Optics Express
|October 14, 2010
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Summary

This study introduces a new method to determine the lidar overlap function for infrared channels (1064 nm) by comparing lidar and ceilometer data. This improves aerosol studies in the planetary boundary layer near the surface.

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Area of Science:

  • Atmospheric Science
  • Remote Sensing
  • Lidar Technology

Background:

  • Lidar overlap function is crucial for accurate atmospheric measurements.
  • Existing methods using Raman signals are limited to specific lidar channels (355, 532 nm) and often require nighttime data.
  • Infrared channels (1064 nm) are essential for aerosol microphysical property retrieval but lack reliable overlap determination methods.

Purpose of the Study:

  • To develop a novel method for determining the lidar overlap function for the 1064 nm channel.
  • To enable accurate aerosol microphysical property retrieval near the surface using infrared lidar data.
  • To enhance the capabilities of Raman lidar systems for atmospheric research.

Main Methods:

  • A modified method comparing attenuated backscatter profiles from lidar and ceilometer.
  • Retrieval of the overlap function for the 1064 nm lidar channel.
  • The method allows overlap correction without explicit knowledge of all system parameters.

Main Results:

  • Successfully retrieved the lidar overlap function for the infrared channel (1064 nm).
  • The proposed method overcomes limitations of Raman-based overlap determination.
  • Enables ground-level backscatter profile information for the 1064 nm channel.

Conclusions:

  • The new method significantly improves the potential of Raman lidars for aerosol research.
  • Extends the investigation of aerosol microphysical properties into the planetary boundary layer, close to the surface.
  • Provides crucial data for understanding atmospheric processes near the ground.