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Related Concept Videos

Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

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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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IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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IR Spectrum01:19

IR Spectrum

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

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

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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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Applications of IR Spectroscopy: Overview01:11

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The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
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Biomolecular Detection employing the Interferometric Reflectance Imaging Sensor IRIS
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Infrared search and track system based on image-spectrum collaborative detection with improved recognition

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    This study introduces an image-spectrum collaborative detection strategy for long-range small target detection and recognition. The novel freeform surface-based infrared search and track (IRST) system enhances target identification capabilities.

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    Area of Science:

    • Optics and Photonics
    • Remote Sensing
    • Infrared Technology

    Background:

    • Long-range detection and recognition of small targets remains a challenge for conventional infrared search and track (IRST) systems.
    • Limited payload capacity restricts the enhancement of recognition capabilities in traditional optical imaging-based IRST.

    Purpose of the Study:

    • To propose and demonstrate an image-spectrum collaborative detection strategy for enhanced remote small target detection and recognition.
    • To present a novel freeform surface-based IRST system integrating imaging and spectrum-measuring channels.

    Main Methods:

    • Developed a freeform surface-based IRST system with shared off-axis three-mirror fore optics for imaging and spectrum-measuring channels.
    • Designed an imaging channel with a 3.52° FOV using freeform surfaces.
    • Integrated a dynamic Fourier transform spectrometer for the narrow FOV spectrum-measuring channel, guided by imaging channel data.

    Main Results:

    • The proposed IRST system enables target recognition through broadband radiation transfer calculations.
    • The spectrum-measuring channel accurately measures characteristic spectra (object's fingerprint) for dynamic small target recognition.
    • Experimental demonstration validated the system's effectiveness in detecting and recognizing dynamic small targets.

    Conclusions:

    • The image-spectrum collaborative detecting strategy significantly improves long-range small target detection and recognition.
    • The presented freeform surface-based IRST system offers a promising solution for overcoming limitations of conventional IRST systems.
    • This approach holds great potential for applications requiring enhanced remote sensing capabilities.