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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...
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to the...
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...
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.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
IR Spectrum01:19

IR Spectrum

When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0% (complete...
Modeling and Similitude01:12

Modeling and Similitude

Scaled modeling is a fundamental technique in engineering, enabling the study of large and complex systems by creating smaller, manageable replicas that recreate critical characteristics of the original. In hydrology and civil infrastructure, for example, scaled models of dams help analyze water flow, turbulence, and pressure. This method allows for accurate predictions of real-world behavior within a controlled environment, significantly reducing the cost and time involved in full-scale...

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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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Published on: March 22, 2019

Infrared simulation model SENSAT-2.

R Richter

    Applied Optics
    |May 22, 2010
    PubMed
    Summary
    This summary is machine-generated.

    The SENSAT-2 computer model simulates infrared signatures for passive sensors, aiding in sensor design and data correction. It integrates atmospheric modeling for accurate analysis across various platforms.

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    Area of Science:

    • Remote Sensing
    • Infrared Spectroscopy
    • Computer Modeling

    Background:

    • Passive sensors are crucial for remote sensing applications.
    • Accurate modeling of infrared (IR) signatures is essential for sensor design and data analysis.
    • Existing models may not fully address the complexities of atmospheric effects and multi-object scenarios.

    Purpose of the Study:

    • To develop a comprehensive computer model, SENSAT-2, for simulating infrared signatures.
    • To enable the analysis of passive sensors operating in the 1-28 micrometer spectral region.
    • To provide a tool for mission analysis, sensor design, and radiometric data processing.

    Main Methods:

    • Development of the SENSAT-2 model incorporating LOWTRAN-6 for atmospheric calculations.
    • Simulation of IR signatures for up to three homogeneous objects within a sensor's field of view.
    • Application of the model to ground-based, aircraft, and satellite platforms.

    Main Results:

    • SENSAT-2 effectively calculates IR signatures, considering atmospheric effects.
    • The model facilitates mission analysis for diverse sensor platforms.
    • It serves as a valuable tool for assessing radiometric relationships in sensor design.

    Conclusions:

    • SENSAT-2 is a versatile tool for remote sensing applications.
    • The model supports sensor design, mission planning, and radiometric data validation.
    • It enhances the accuracy of infrared signature analysis in various operational contexts.