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Design Example: Measuring Distance Between Two Points with Obstructions01:10

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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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Picometer-Precision Atomic Position Tracking through Electron Microscopy
15:04

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Published on: July 3, 2021

Precise displacement measurement for a local surface.

Sheng Lih Yeh1, Shyh Tsong Lin, Yu Hsin Chang

  • 1Department of Mechanical Engineering, Lunghwa University of Science and Technology, 300, Section 1, Wanshou Road, Kueishan, Taoyuan County 33306, Taiwan. slyeh@mail.lhu.edu.tw

Optics Letters
|November 3, 2009
PubMed
Summary
This summary is machine-generated.

A novel laser-based optical method accurately measures surface displacements with sub-10 nm errors. This cost-effective technique simultaneously captures in-plane and out-of-plane movements using interference fringe shifts.

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08:23

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Metrology

Background:

  • Accurate measurement of surface displacement is crucial in various scientific and engineering fields.
  • Existing methods may be complex, expensive, or limited in their ability to measure multi-directional displacements simultaneously.

Purpose of the Study:

  • To propose and validate a novel, low-cost optical measurement method.
  • To achieve simultaneous measurement of in-plane and out-of-plane surface displacements.
  • To demonstrate high accuracy in displacement measurements.

Main Methods:

  • Utilizes a laser-based optical setup.
  • Employs the measurement of interference fringe shifts formed by scattered beams.
  • Simultaneously derives both in-plane and out-of-plane displacement components.

Main Results:

  • Achieved average errors significantly smaller than 10 nanometers for both displacement types.
  • Demonstrated simultaneous measurement capability.
  • The method relies on inexpensive optical components.

Conclusions:

  • The proposed optical method offers a precise and economical solution for surface displacement analysis.
  • It provides simultaneous in-plane and out-of-plane displacement data with high accuracy.
  • This technique has potential applications in fields requiring sensitive surface metrology.