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Related Concept Videos

Distance Measurements by Taping01:18

Distance Measurements by Taping

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Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
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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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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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Updated: Dec 25, 2025

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Precise building deformation measurement using holographic multipoint replication.

Flavio Guerra, Tobias Haist, Alexander Warsewa

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    Summary
    This summary is machine-generated.

    This study introduces a fast, accurate vision-based deformation measurement technique for active structural control. It achieves high precision for large-scale structures like buildings and bridges.

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    Area of Science:

    • Structural Engineering
    • Optical Measurement Techniques
    • Control Systems

    Background:

    • Active control of large-scale structures requires precise local deformation measurements.
    • Existing methods may lack the speed or accuracy needed for real-time applications.

    Purpose of the Study:

    • To present a novel, high-accuracy, and fast vision-based measurement technique.
    • To demonstrate its application in controlling an adaptive structures prototype frame.

    Main Methods:

    • Utilized a photogrammetric approach with holographic spot replication for deformation detection.
    • Applied the technique to measure deformations at multiple discrete points on a prototype frame.
    • Employed hydraulic actuators for adaptive structure control.

    Main Results:

    • Achieved a measurement uncertainty of 0.0077 pixels (0.055 mm) over 11.4 m.
    • Demonstrated effective averaging of error contributions like discretization and photon noise.
    • Presented the first experimental results for controlling an adaptive structure using this method.

    Conclusions:

    • The vision-based technique offers high accuracy and speed for structural deformation monitoring.
    • Holographic spot replication enhances measurement reliability by reducing errors.
    • This method is suitable for active control of large-scale structures like high-rise buildings and bridges.