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Related Concept Videos

Leveling Equipment01:18

Leveling Equipment

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As leveling involves measuring vertical distances relative to a horizontal line of sight, it requires a graduated rod, called a level rod, for vertical measurements and an instrument called a level for a horizontal sight line. A level includes a high-powered telescope with a mechanism for leveling to ensure the line of sight is horizontal when the bubble in the spirit level is centered. Leveling rods, made of wood, metal, or fiberglass, are graduated in feet or meters and commonly used in two-...
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Design Example: Measuring Distance Between Two Points with Obstructions01:10

Design Example: Measuring Distance Between Two Points with Obstructions

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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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Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over...
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Distance Corrections01:15

Distance Corrections

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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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Automatic Laser-based Geometry Capture for Finite Element Analysis of Weld Beads
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An Accurate Image Measurement Method Based on a Laser-Based Virtual Scale.

Shiping Huang1,2, Wei Ding3, Yonghui Huang4

  • 1School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China. ctasihuang@scut.edu.cn.

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Summary
This summary is machine-generated.

This study introduces a simple optical device for accurate non-contact measurements. The method uses a virtual scale and moving least squares (MLS) for sub-pixel precision, ideal for inaccessible structures.

Keywords:
full-field scalelaser virtual scalemoving least squaresnon-contacting measurement

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Area of Science:

  • Optical Engineering
  • Metrology
  • Computer Vision

Background:

  • Image measurement techniques are accurate but often require complex calibration and are sensitive to environmental factors.
  • Existing methods can be cumbersome, limiting their application in challenging environments.

Purpose of the Study:

  • To develop a simple, robust, and accurate optical device for non-contact measurements.
  • To create a virtual scale for mapping image coordinates to world coordinates.
  • To achieve high-precision measurements at the sub-pixel level.

Main Methods:

  • Designed a simple optical device emitting parallel beams to generate a virtual scale.
  • Developed a theory ensuring scale robustness under uncertainty.
  • Utilized the moving least squares (MLS) method to reconstruct a full-field scale map.

Main Results:

  • The proposed method demonstrated high accuracy and reliability in experimental verifications.
  • The system achieves sub-pixel measurement precision.
  • The virtual scale is automatically calculated, simplifying the process.

Conclusions:

  • The developed optical device offers a simple and effective solution for non-contact measurements.
  • This approach is suitable for measuring geometric sizes and crack development in inaccessible structures like bridges and buildings.
  • The system's robustness and ease of use make it a promising tool for structural health monitoring.