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Area Computation by the Alternative Coordinate Method01:24

Area Computation by the Alternative Coordinate Method

496
The alternative coordinate method, also known as the Shoelace Formula, is a technique for determining the area of a traverse using Cartesian coordinates. This method relies on the sequential arrangement of x and y coordinates for each point of the shape, ensuring accuracy and ease of application.In this approach, each corner's x and y coordinates are listed as fractions, with the x-coordinate as the numerator and the y-coordinate as the denominator. These coordinates are arranged sequentially...
496

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Related Experiment Video

Updated: Jan 3, 2026

Three-dimensional Super Resolution Microscopy of F-actin Filaments by Interferometric PhotoActivated Localization Microscopy iPALM
11:57

Three-dimensional Super Resolution Microscopy of F-actin Filaments by Interferometric PhotoActivated Localization Microscopy iPALM

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Improved calibration of area detectors using multiple placements.

Caitlin Horn1, Keara M Ginell1, Robert B Von Dreele1

  • 1Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, IL 60439, USA.

Journal of Synchrotron Radiation
|November 14, 2019
PubMed
Summary

Accurate powder diffraction requires precise detector calibration. This study shows how to determine sample-to-detector distance and wavelength using multiple images, improving powder diffraction data quality.

Keywords:
area detectioncalibrationpowder diffraction

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Area of Science:

  • Materials Science
  • Crystallography
  • Synchrotron Radiation

Background:

  • Area detector calibration is crucial for accurate powder diffraction data at synchrotron beamlines.
  • A single diffraction image is insufficient to determine both sample-to-detector distance and wavelength simultaneously.

Purpose of the Study:

  • To present a method for precise calibration of area detectors in powder diffraction.
  • To determine both sample-to-detector distance and wavelength accurately.

Main Methods:

  • Acquiring multiple diffraction images from known relative positions along the beam direction.
  • Utilizing powder diffraction standards for calibration.
  • Employing the GSAS-II software package for data analysis.

Main Results:

  • Demonstrated the ability to determine sample-to-detector distance and wavelength with high precision.
  • Provided a practical example of area detector calibration using GSAS-II.

Conclusions:

  • The proposed method enables accurate area detector calibration for powder diffraction.
  • Precise calibration is essential for reliable analysis of synchrotron powder diffraction data.