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Related Concept Videos

Plastic Deformations01:19

Plastic Deformations

465
Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
465
Plastic Deformations01:14

Plastic Deformations

443
It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
443
Taping Over Different Ground Profiles01:12

Taping Over Different Ground Profiles

378
Taping over varying ground profiles requires careful adaptation to achieve accurate measurements. On smooth, level ground with minimal vegetation, the tape can rest directly on the ground. Here, the taping team, typically consisting of a head and a rear tapeman, coordinates their positions with clear communication. The rear tapeman holds the tape at the starting point and guides the head tapeman toward a range pole placed beyond the endpoint, using hand or voice signals to ensure alignment.On...
378
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

398
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
398
Deformations in a Symmetric Member in Bending01:18

Deformations in a Symmetric Member in Bending

520
When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
520
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

476
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
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Characterization of Surface Modifications by White Light Interferometry: Applications in Ion Sputtering, Laser Ablation, and Tribology Experiments
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Integrated Ground-Based SAR Interferometry, Terrestrial Laser Scanner, and Corner Reflector Deformation Experiments.

Xiangtian Zheng1,2, Xiaolin Yang3, Haitao Ma4

  • 1School of Mechanical Electronic & Information Engineering, China University of Mining and Technology (Beijing), No. Ding-11, College Road, Haidian District, Beijing 100083, China. aforest0459@foxmail.com.

Sensors (Basel, Switzerland)
|December 15, 2018
PubMed
Summary

This study validates ground-based synthetic aperture radar (GB-SAR) micro-displacement measurements using an integrated sensor system. The system combines terrestrial laser scanning (TLS) and corner reflectors (CRs) for precise deformation monitoring and data optimization.

Keywords:
corner reflector (CR), deformation experimentgeometric mappingground-based synthetic radar (GB-SAR)terrestrial laser scanner (TLS)

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Area of Science:

  • Geodesy and Geophysics
  • Remote Sensing Technology
  • Geotechnical Engineering

Background:

  • Ground-based synthetic aperture radar (GB-SAR) is a valuable tool for monitoring surface deformation.
  • Accurate validation of GB-SAR measurements is crucial for reliable displacement analysis.
  • Existing validation methods may lack the precision required for micro-displacement detection.

Purpose of the Study:

  • To develop and validate an integrated sensor system for precise GB-SAR micro-displacement measurement.
  • To enhance the accuracy and interpretability of GB-SAR deformation data.
  • To optimize data processing techniques for improved coherent scatterer selection.

Main Methods:

  • Deployment of a high-precision linear rail (0.1 mm accuracy) with a mobile corner reflector (CR).
  • Integration of terrestrial laser scanner (TLS) for 3D surface modeling and CR identification.
  • Analysis of GB-SAR zero-baseline interferometry and comparison with TLS data for validation.

Main Results:

  • The integrated system accurately captured micro-displacements with high precision.
  • TLS data facilitated accurate data matching and enabled the generation of intuitive 3D deformation products.
  • Quantitative analysis confirmed the reliability of the proposed method for target displacement extraction.

Conclusions:

  • The combined TLS, CR, and linear rail system offers a robust solution for validating GB-SAR interferometric measurements.
  • This integrated approach significantly improves the accuracy and reliability of micro-displacement monitoring.
  • The optimized data processing enhances the utility of GB-SAR for various geodetic and engineering applications.