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Methods of Obtaining Topography01:25

Methods of Obtaining Topography

Topography involves measuring and mapping land elevations, natural features, and artificial structures to create accurate representations of the terrain. Topographic surveying relies on traditional and modern methods, each with distinct advantages and limitations.Traditional Surveying Methods:Transit stadia surveys and plane table surveys were widely used traditional surveying methods. These techniques relied on instruments like theodolites and stadia rods for measuring distances and angles,...
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Topographic surveying is critical for documenting the Earth's surface, focusing on capturing elevations, slopes, and natural and man-made features. It is essential in construction planning, water resource management, and land-use analysis. The primary outcome of such surveys is a topographic map, which uses contour lines to visually represent the shape and slope of the terrain, providing valuable insights into the landscape's characteristics.Contour lines are fundamental to understanding the...
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Topographic maps represent the Earth's surface features using contour lines, which connect points of equal elevation to create a two-dimensional representation of three-dimensional terrain. Creating a topographic map requires a systematic approach.Begin by plotting a scaled grid and marking intersections corresponding to the survey's elevation data points. Assign elevation values at these intersections to build the base map. Next, determine contour levels using a consistent contour interval,...

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Automated luminescent topographic system.

M J Luciano1, D L Kingston

  • 1Systems Research Laboratories, Inc., 2800 Indian Ripple Road, Dayton, Ohio 45440Air Force Avionics Laboratory, Wright Patterson AFB, Ohio 45433.

The Review of Scientific Instruments
|June 1, 1978
PubMed
Summary
This summary is machine-generated.

A novel optical-scanning technique enables detailed surface luminescence mapping with 10 micrometer resolution. This automated photoluminescence topography system analyzes luminescence intensity and spectra for applications like semiconductor impurity analysis.

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Area of Science:

  • Materials Science
  • Optical Physics
  • Analytical Chemistry

Background:

  • Surface luminescence analysis is crucial for material characterization.
  • Existing techniques may lack the required spatial resolution or automation.
  • Understanding surface properties informs material performance and defect analysis.

Purpose of the Study:

  • To develop a high-resolution optical-scanning technique for surface luminescence observation.
  • To create a fully automated system for comprehensive luminescence analysis.
  • To demonstrate the technique's utility in analyzing semiconductor impurity segregation.

Main Methods:

  • Development of a photoluminescence topographic technique utilizing an Ar-ion laser for excitation.
  • Implementation of a bidirectional scanner with a focusing lens for precise surface interrogation.
  • Integration of a high-resolution spectrometer and photomultiplier for spectral and intensity measurements.
  • Automated data acquisition and control using a Hewlett-Packard 9820A calculator system.

Main Results:

  • Achieved a spatial resolution of 10 micrometers for surface luminescence observation.
  • System capable of measuring luminescence intensity over areas up to 25.8 cm³.
  • Ability to acquire luminescence spectra from spots as small as 10 micrometers in diameter.
  • Successful application in analyzing impurity segregation in semiconductor wafers.

Conclusions:

  • The developed optical-scanning technique offers unprecedented spatial resolution for surface luminescence analysis.
  • The automated photoluminescence topography system provides a powerful tool for detailed material characterization.
  • This technique is highly applicable for identifying and analyzing microscale variations, such as impurity segregation in semiconductors.