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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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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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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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Related Experiment Video

Updated: Jun 8, 2026

Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes
06:56

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Published on: May 23, 2017

New spin filters for interferometric fringe patterns and grating patterns.

Q Yu, X Liu, K Andresen

    Applied Optics
    |October 2, 2010
    PubMed
    Summary

    Researchers improved spin filters to effectively remove noise from interferometric fringe patterns. These advanced filters minimize blurring and phase distortion, enhancing image clarity for various applications.

    Area of Science:

    • Optics and Photonics
    • Image Processing

    Background:

    • Interferometric fringe patterns are crucial for measurements but susceptible to noise.
    • Existing filters often introduce blurring or phase distortion, limiting their effectiveness.

    Purpose of the Study:

    • To enhance the basic spin filter for improved noise reduction in interferometric fringe patterns.
    • To develop versatile spin filter versions applicable to diverse fringe pattern types.

    Main Methods:

    • The improved spin filters identify the local fringe tangent direction.
    • A one-dimensional low-pass filter is applied along the identified fringe direction.
    • This method effectively separates high-frequency noise from low-frequency fringe signals.

    Main Results:

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    • The new spin filters demonstrate efficient random noise removal.
    • Minimal blurring and phase distortion are observed in the processed fringe patterns.
    • The filters successfully handle various patterns, including wrapped-phase, line-grating, and cross-grating.

    Conclusions:

    • The enhanced spin filters offer superior noise filtering for interferometric fringe patterns.
    • These filters provide a robust solution for applications requiring high-fidelity fringe analysis.
    • The developed versions overcome limitations of common filters, expanding their applicability.