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Related Concept Videos

Calibration Curves: Linear Least Squares01:20

Calibration Curves: Linear Least Squares

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A calibration curve is a plot of the instrument's response against a series of known concentrations of a substance. This curve is used to set the instrument response levels, using the substance and its concentrations as standards. Alternatively, or additionally, an equation is fitted to the calibration curve plot and subsequently used to calculate the unknown concentrations of other samples reliably.
For data that follow a straight line, the standard method for fitting is the linear...
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Measurements of Strain01:27

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Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
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Related Experiment Video

Updated: Jan 4, 2026

Stereo-Imaging System DLT Calibration to Capture 3D In Situ Displacements of Stretched Peripheral Nerves
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Real-time subtraction-based calibration methods for deformation measurement using structured light techniques.

Cuiru Sun, Xinya Zhang

    Applied Optics
    |November 2, 2019
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    Summary
    This summary is machine-generated.

    Accurate out-of-plane displacement measurement requires calibration of structured light optical trigonometry. This study proposes a simple, real-time image subtraction method for calibrating digital fringe projection and digital projection-speckle correlation techniques.

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    Area of Science:

    • Optical Metrology
    • Experimental Mechanics
    • Image Processing

    Background:

    • Accurate out-of-plane displacement measurement is critical in various engineering applications.
    • Structured light techniques are widely used for 3D shape and deformation analysis.
    • Existing calibration methods for structured light can be complex and time-consuming.

    Purpose of the Study:

    • To develop a simple and effective calibration mechanism for structured light techniques.
    • To improve the accuracy of out-of-plane displacement measurements.
    • To provide alternative calibration methods for structured light systems.

    Main Methods:

    • A novel calibration mechanism based on real-time image subtraction is proposed.
    • Calibration of the height-to-phase ratio for digital fringe projection is detailed.
    • Calibration of the relationship between out-of-plane and in-plane displacements for digital projection-speckle correlation is described.
    • The scale factor of the optical system is also calibrated.

    Main Results:

    • The proposed calibration methods were successfully applied to measure the deformation of a clamped Plexiglas plate.
    • The experimental results demonstrate the effectiveness and accuracy of the real-time subtraction-based calibration.
    • The methods provide reliable calibration for structured light systems.

    Conclusions:

    • Real-time image subtraction offers a practical and efficient approach for calibrating structured light techniques.
    • The developed methods enhance the accuracy of out-of-plane displacement measurements.
    • These calibration techniques are valuable for various applications in experimental mechanics and optical metrology.