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Related Concept Videos

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In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
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Related Experiment Video

Updated: Aug 25, 2025

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation
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Precision roll angle measurement system based on autocollimation.

Wenran Ren, Jiwen Cui, Jiubin Tan

    Applied Optics
    |October 18, 2022
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel autocollimation method for precise roll angle measurement, overcoming limitations of traditional techniques. The new system achieves high accuracy and resolution, enabling advanced angular metrology applications.

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    Area of Science:

    • Optical Engineering
    • Metrology
    • Angular Measurement

    Background:

    • Traditional autocollimation excels in small angle measurement but is unsuitable for roll angle determination.
    • Existing methods lack the precision required for accurate roll angle quantification.

    Purpose of the Study:

    • To develop a novel autocollimation-based method for high-precision roll angle measurement.
    • To address the limitations of traditional autocollimation in measuring roll angles.

    Main Methods:

    • Utilized a transmission grating to generate dual measurement beams.
    • Designed a combined target as the core angle sensor.
    • Employed differential measurement to mitigate light source beam angle drift.

    Main Results:

    • Achieved a roll angle resolution better than 0.05 arcseconds.
    • Demonstrated system accuracy of 0.20 arcseconds.
    • Verified performance within a measurement range of 250 arcseconds.

    Conclusions:

    • The proposed autocollimation method effectively measures roll angles with high accuracy and resolution.
    • Differential measurement significantly suppresses errors from light source beam drift.
    • The system is suitable for applications demanding precise roll angle metrology.