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Related Concept Videos

IR Spectrometers01:25

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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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Updated: Oct 31, 2025

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
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Infrared phase measuring deflectometry by using defocused binary fringe.

Yanqing Shi, Caixia Chang, Xiaohong Liu

    Optics Letters
    |July 1, 2021
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a new infrared phase measuring deflectometry (PMD) method using defocused binary fringe patterns. It effectively measures specular surfaces outside the camera's depth of field, overcoming limitations of traditional methods.

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    Area of Science:

    • Optics and Photonics
    • Metrology and Measurement Science
    • Computer Vision and Robotics

    Background:

    • Three-dimensional surface acquisition of specular objects is crucial for industries like automotive, aerospace, and robotics.
    • Existing methods using focused sinusoidal fringe patterns struggle with objects outside the camera's depth of field (DOF), leading to noise issues.
    • Specular surfaces with large gradients often fall outside the DOF, limiting measurement accuracy.

    Purpose of the Study:

    • To propose a novel infrared phase measuring deflectometry (PMD) method for measuring specular surfaces.
    • To address the limitations of existing methods concerning the depth of field (DOF) of the camera.
    • To enable accurate 3D surface measurement of specular objects even when they are out of focus.

    Main Methods:

    • Development of an infrared phase measuring deflectometry (PMD) system.
    • Integration of a binary fringe defocusing technique with direct PMD.
    • System calibration and theoretical analysis of fringe defocus feasibility and accuracy in specular measurement.

    Main Results:

    • The proposed method effectively measures specular surfaces that are outside the camera's depth of field (DOF).
    • Experimental results demonstrate the feasibility and accuracy of the fringe defocusing technique for specular surfaces.
    • The system overcomes noise issues associated with defocused sinusoidal patterns.

    Conclusions:

    • The novel infrared PMD method using defocused binary fringe patterns offers a robust solution for 3D specular surface measurement.
    • This technique expands the applicability of PMD to challenging specular surfaces with large gradients.
    • The study validates the effectiveness of fringe defocusing for out-of-DOF specular object measurement.