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Related Concept Videos

Adjusting a Traverse01:12

Adjusting a Traverse

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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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When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
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Roll angle measurement method based on a double-sided optical wedge.

Yan Guo, Jiali Ji, Yu Zhang

    Applied Optics
    |August 12, 2025
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel method for measuring roll angle over a full 360° range using a double-sided optical wedge. The technique achieves high accuracy, offering a reliable solution for this challenging geometric parameter measurement.

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    Area of Science:

    • Optical Metrology
    • Geometric Parameter Measurement
    • Instrumentation Engineering

    Background:

    • Roll angle is a critical geometric parameter in various applications.
    • Accurate measurement of roll angle, especially over 360°, presents significant challenges.
    • Existing methods may lack the precision or range required for comprehensive analysis.

    Purpose of the Study:

    • To propose and validate a novel method for 360° roll angle measurement.
    • To develop a system utilizing a double-sided optical wedge (DOW) for enhanced measurement.
    • To achieve high accuracy in large-range roll angle determination.

    Main Methods:

    • Employed a specifically designed double-sided optical wedge (DOW) as a probe.
    • Utilized a photodetector to image two divided light beams.
    • Determined roll angle by analyzing the motion trajectories of the two images.

    Main Results:

    • The measurement system demonstrated an accuracy better than ±7.72 arcsec.
    • Effective measurement was achieved across the entire 360° range.
    • Experimental validation confirmed the principle's effectiveness.

    Conclusions:

    • The proposed DOW-based method provides an effective solution for large-range roll angle measurement.
    • The system offers high precision suitable for demanding applications.
    • This technique advances the field of geometric parameter metrology.