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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 7, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

Profilometry by phase-shifted Talbot images.

B F Oreb, R G Dorsch

    Applied Optics
    |October 22, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A new profilometry sensor uses Talbot self-imaging and phase shifting for precise object relief measurement. This optical sensor accurately profiles surfaces, demonstrating its utility in precision manufacturing like lens production.

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    Last Updated: Jun 7, 2026

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    Area of Science:

    • Optical Metrology
    • Surface Profilometry
    • Diffraction Optics

    Background:

    • Traditional profilometry methods face limitations in precision and complexity.
    • Phase shifting techniques are established for surface measurement.
    • Talbot self-imaging offers unique illumination properties for optical sensing.

    Purpose of the Study:

    • To introduce a novel profilometry sensor combining phase shifting with Talbot self-imaging.
    • To theoretically analyze and experimentally validate the contrast of Talbot diffraction patterns.
    • To derive the mathematical relationship for converting phase measurements to object relief.

    Main Methods:

    • Integration of a sinusoidal grating for Talbot self-imaging within a phase-shifting profilometry setup.
    • Theoretical discussion and experimental verification of diffraction pattern contrast in a diverging beam.
    • Development of a mathematical model to correlate measured phase with object surface topography.

    Main Results:

    • Successful implementation of a profilometry sensor utilizing Talbot self-imaging and phase shifting.
    • Experimental validation of the theoretical contrast analysis for Talbot diffraction patterns.
    • Demonstration of the sensor's capability by profiling a ceramic former used in lens production.

    Conclusions:

    • The developed sensor effectively measures object relief by combining Talbot self-imaging and phase shifting.
    • The sensor shows promise for high-precision surface profiling applications.
    • Experimental results confirm the sensor's practical applicability in manufacturing processes.