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Related Concept Videos

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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Infrared (IR) Spectroscopy: Overview01:09

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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.
Different compounds display unique properties due to their...
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IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
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IR Spectrometers01:25

IR Spectrometers

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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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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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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Updated: May 30, 2025

Conducting Hyperscanning Experiments with Functional Near-Infrared Spectroscopy
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Phase-based structured interrogation frequency-domain near-infrared spectroscopy.

Ola Abdalsalam, Scott Howard, Thomas D O'Sullivan

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |January 28, 2025
    PubMed
    Summary
    This summary is machine-generated.

    Structured interrogation (SI) enhances frequency-domain near-infrared spectroscopy (FD-NIRS) for accurate tissue optical property estimation. This novel method improves sensitivity to deeper tissue layers, aiding in infant brain monitoring.

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    Area of Science:

    • Biomedical Optics
    • Spectroscopy
    • Tissue Optics

    Background:

    • Frequency-domain near-infrared spectroscopy (FD-NIRS) is a noninvasive technique for measuring tissue optical properties.
    • Accurate estimation of optical properties is crucial for applications like functional brain monitoring.
    • Challenges exist in achieving high sensitivity to deeper tissue layers and accurate measurements in multilayered tissues.

    Purpose of the Study:

    • Introduce structured interrogation (SI) as an interference-based approach for FD-NIRS.
    • Enhance optical property estimation in multilayered tissues.
    • Improve sensitivity to deeper tissue layers for more accurate measurements.

    Main Methods:

    • Implemented structured interrogation (SI) for FD-NIRS measurements.
    • Evaluated SI's performance in estimating optical properties and chromophore concentrations under realistic noise conditions.
    • Analyzed the phase-only component of SI FD-NIRS for quantifying optical absorption and scattering.

    Main Results:

    • SI FD-NIRS accurately estimated optical properties and chromophore concentrations with less than 5% error in the presence of noise.
    • The phase-only component of SI FD-NIRS quantified optical absorption and reduced scattering in homogeneous tissues.
    • SI FD-NIRS demonstrated a 20% improved sensitivity to absorption changes in deeper tissues compared to conventional methods.

    Conclusions:

    • Structured interrogation is an effective interference-based approach for FD-NIRS.
    • SI FD-NIRS enhances accuracy and sensitivity, particularly for deeper tissue layers.
    • This method shows promise for improving functional brain monitoring in infants by reducing superficial contamination.