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Related Concept Videos

Interference and Diffraction02:18

Interference and Diffraction

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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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
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Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and refractory oxide ion...
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Interference: Path Lengths

Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
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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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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Interference patterns in cross-grating interferometers: further analysis.

Y S Cheng

    Applied Optics
    |June 16, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study analyzes fringe characteristics in four-beam cross-grating interferometers. High-contrast fringes can be achieved by using four line gratings, enabling source irradiance distribution synthesis.

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    Area of Science:

    • Optics and Photonics
    • Interferometry
    • Diffraction Gratings

    Background:

    • Analysis of fringe characteristics in four-beam cross-grating interferometers is crucial for understanding optical systems.
    • Illumination from a source at a finite distance introduces complexities in fringe analysis.

    Purpose of the Study:

    • To analyze fringe characteristics in four-beam cross-grating interferometers under finite distance illumination.
    • To synthesize the spatial irradiance distribution of the illuminating source.
    • To investigate methods for achieving high-contrast fringes.

    Main Methods:

    • Measurement of fringe visibilities and fringe shifts on discrete planes.
    • Analysis of fringe patterns generated by cross-grating interferometers.
    • Exploration of grating configurations for contrast enhancement.

    Main Results:

    • Spatial irradiance distribution of the illuminating source, separable in two orthogonal directions, can be synthesized from fringe measurements.
    • Non-parallel line structures in cross gratings lead to lower fringe contrast.
    • Using four line gratings instead of two cross gratings enhances fringe contrast.

    Conclusions:

    • The study successfully synthesized the source irradiance distribution and identified conditions for high-contrast fringes.
    • Alternative configurations, including combinations of gratings and interferometers, can form cross-gratinglike patterns.
    • Moire interferometry using a cross-grating interferometer is a promising application.