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Related Concept Videos

2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

2D NMR: Homonuclear Correlation Spectroscopy (COSY)

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Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
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Computed Tomography01:10

Computed Tomography

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
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Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Related Experiment Video

Updated: Feb 20, 2026

Digital Inline Holographic Microscopy DIHM of Weakly-scattering Subjects
10:16

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Compressive correlation holography.

Rachit Saluja, G R K S Subrahmanyam, Deepak Mishra

    Applied Optics
    |October 20, 2017
    PubMed
    Summary
    This summary is machine-generated.

    Compressive sensing (CS) with thresholding significantly reduces sample requirements for correlation holography. This advanced technique enhances hologram reconstruction and image processing applications.

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    Area of Science:

    • Optics and Photonics
    • Digital Image Processing
    • Signal Reconstruction

    Background:

    • Correlation holography traditionally requires extensive data acquisition.
    • Compressive sensing (CS) offers a potential solution for reducing data needs in various imaging modalities.
    • Laser speckle patterns provide a basis for generating measurement and sensing matrices.

    Purpose of the Study:

    • To develop and validate a compressive sensing (CS) framework for correlation holography.
    • To investigate the efficacy of thresholding within the CS framework for improved reconstruction.
    • To compare the performance of CS-based methods against traditional intensity correlation.

    Main Methods:

    • Implementing a CS framework by integrating compressive sensing and thresholding principles.
    • Utilizing two-point intensity correlation as the core mechanism for holography.
    • Extracting measurement and sensing matrices from laser speckle illumination data.

    Main Results:

    • The proposed CS framework, particularly with thresholding, significantly reduces the number of samples needed for hologram reconstruction.
    • CS-based methods demonstrate superior performance compared to standard intensity correlation techniques.
    • The framework shows promise for efficient image reconstruction in holographic applications.

    Conclusions:

    • Compressive sensing with thresholding is an effective method for sparse data acquisition in correlation holography.
    • This approach offers a substantial improvement in efficiency and sample reduction for hologram reconstruction.
    • The developed framework has broad applicability in advanced image reconstruction and optical sensing.