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Related Concept Videos

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...
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.
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
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Interference: Path Lengths01:10

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.
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Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single stretching vibration...

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Related Experiment Video

Updated: Jul 9, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Published on: October 11, 2016

Differential phase measurements in low-coherence interferometry without 2pi ambiguity.

C K Hitzenberger, M Sticker, R Leitgeb

    Optics Letters
    |December 7, 2007
    PubMed
    Summary

    This study introduces a novel method to overcome the 2pi ambiguity in quantitative phase measurements using low-coherence interferometry. The technique enables accurate optical path difference measurements beyond the typical lambda/2 limitation.

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    Area of Science:

    • Optical Physics
    • Metrology
    • Biomedical Optics

    Background:

    • Quantitative phase measurements using low-coherence interferometry and optical coherence tomography are limited by 2pi ambiguity.
    • This ambiguity restricts path-length difference measurements to less than lambda/2.

    Purpose of the Study:

    • To present a novel method for overcoming the 2pi ambiguity in quantitative phase measurements.
    • To enable accurate optical path difference measurements beyond the conventional limitations.

    Main Methods:

    • Introducing a slight dispersion imbalance between reference and sample arms of an interferometer.
    • Utilizing the spectral separation of wavelengths within the interferometric signal.
    • Calculating phase-difference functions and analyzing their slopes.

    Main Results:

    • The proposed method successfully overcomes the 2pi ambiguity.
    • The phase slope variation across the interferometric signal is directly proportional to the optical path difference.
    • Accurate measurements are achieved for path-length differences exceeding lambda/2.

    Conclusions:

    • The developed technique offers a significant advancement for quantitative phase measurements.
    • This method enhances the capabilities of low-coherence interferometry and optical coherence tomography.
    • It opens new possibilities for precise metrology in various scientific fields.