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Related Concept Videos

Interference and Diffraction02:18

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Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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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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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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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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Atomic Emission Spectroscopy: Interference01:30

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In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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Atomic Absorption Spectroscopy: Interference01:25

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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
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Interferenceless coded aperture correlation holography with synthetic point spread holograms.

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    Lensless, interferenceless coded aperture correlation holography (LI-COACH) now uses a digitally synthesized point spread hologram (PSH) library. This method significantly reduces the training time for 3D imaging applications.

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    Area of Science:

    • Optics
    • Computational Imaging
    • Holography

    Background:

    • Lensless, interferenceless coded aperture correlation holography (LI-COACH) is an incoherent computational optical technique for 3D imaging.
    • LI-COACH is an indirect imaging technique involving PSH training and object hologram recording.

    Purpose of the Study:

    • To digitally synthesize the entire PSH library from a single recorded PSH.
    • To reduce the training time required for LI-COACH.

    Main Methods:

    • A single PSH is recorded at one plane.
    • The recorded PSH is scaled by magnification factors for different axial planes to create a synthetic PSH library.
    • 3D object images are reconstructed using cross-correlation with the synthetic PSH library.

    Main Results:

    • The digitally synthesized PSH library yields reconstruction results comparable to a recorded PSH library.
    • The proposed approach significantly reduces the training step duration in LI-COACH.

    Conclusions:

    • Digital synthesis of the PSH library is a viable and time-efficient alternative for LI-COACH.
    • This advancement streamlines the LI-COACH process for 3D imaging.