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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

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...
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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: Jun 20, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Collimation method that uses spiral gratings and Talbot interferometry.

C W Chang, D C Su

    Optics Letters
    |September 29, 2009
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a simple method using spiral gratings to check light collimation quality. Moiré fringe patterns reveal the light

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    Area of Science:

    • Optics and Photonics
    • Optical Metrology

    Background:

    • Accurate light collimation is crucial for various optical systems.
    • Traditional methods for assessing collimation can be complex or require specialized equipment.

    Purpose of the Study:

    • To develop a straightforward technique for evaluating the quality of light collimation.
    • To utilize spiral gratings and moiré fringes for optical beam analysis.

    Main Methods:

    • Projecting light onto an arrangement of two spiral gratings.
    • Positioning the second spiral grating at the Talbot image of the first.
    • Analyzing the shapes of the resulting moiré fringes.

    Main Results:

    • The shape of moiré fringes directly correlates with the collimation quality of the light.
    • This method provides an easily interpretable visual indicator of beam quality.

    Conclusions:

    • The proposed method offers a simple and effective way to check light collimation.
    • Spiral gratings and Talbot imaging provide a practical tool for optical quality assessment.