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Related Concept Videos

Distance Corrections01:15

Distance Corrections

308
To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
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Influence of Earth's Curvature and Atmospheric Refraction on Leveling01:26

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During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance. Over a...
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Related Experiment Video

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Measuring the Complete-arch Distortion of an Optical Dental Impression
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High-precision lateral distortion measurement and correction in coherence scanning interferometry using an arbitrary

Peter Ekberg, Rong Su, Richard Leach

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    |October 19, 2017
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    Summary

    This study introduces a novel, cost-effective method for calibrating and correcting optical distortion in coherence scanning interferometry. It utilizes arbitrary surfaces, significantly reducing the complexity and expense associated with traditional calibration artifacts.

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    Area of Science:

    • Optical Metrology
    • Surface Metrology
    • Interferometry

    Background:

    • Lateral optical distortion is a common issue in optical imaging systems.
    • In coherence scanning interferometry (CSI), distortion can lead to field-dependent systematic errors in surface topography measurements, critical for high-precision surfaces.
    • Existing calibration methods rely on expensive, complex calibration artifacts with precisely manufactured features.

    Purpose of the Study:

    • To develop and demonstrate a new method for calibrating and correcting optical distortion in CSI systems.
    • To reduce the cost and complexity of distortion correction for high-precision surface measurements.
    • To enable the use of arbitrary, readily available surfaces for distortion calibration.

    Main Methods:

    • Utilized image processing and a self-calibration technique to analyze arbitrary surfaces with detectable features.
    • Applied the method to surfaces like coins or defected mirrors, requiring only deviations from flatness and some features.
    • Developed a simplified approach for traceability by measuring the distance between two arbitrary points.

    Main Results:

    • Achieved distortion correction with nanometre-level precision.
    • Demonstrated that inexpensive and readily available surfaces can be used for calibration.
    • Significantly reduced the cost and complexity of distortion calibration and correction.

    Conclusions:

    • The proposed method offers a cost-effective and simplified approach to optical distortion correction in CSI.
    • Arbitrary surfaces, previously unsuitable, can now be leveraged for high-precision metrology.
    • This advancement lowers the barrier for accurate surface topography measurements in various applications.