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Distance Measurements by Taping01:18

Distance Measurements by Taping

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Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
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Electronic Distance Measuring Instruments01:30

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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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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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Structures of Solids02:22

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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When an object's velocity changes over time, the total distance traveled can be determined by summing small displacement intervals over short increments. This approach approximates the true distance through numerical summation and the use of integral calculus. An estimate of the total displacement can be obtained by measuring velocity at regular intervals and multiplying each value by the corresponding time step.If a runner accelerates over the first three seconds of a race, speed measurements...
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Distance Corrections01:15

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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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Updated: Jan 21, 2026

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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Automated optical distance measurements for counting at a defined solid angle.

M Marouli1, S Pommé1

  • 1European Commission, Joint Research Centre (JRC), Geel, Belgium.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|August 9, 2019
PubMed
Summary
This summary is machine-generated.

Two optical devices accurately measured alpha-particle counter geometry. A modern 3D machine offers easier use and lower health risks compared to a travelling microscope, despite similar measurement accuracy.

Keywords:
Distance measurementGeometrical efficiencyOptical focusingPrimary standardisationRadioactivitySolid angle

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Area of Science:

  • Metrology
  • Radiation Detection Instrumentation

Background:

  • Accurate source-detector geometry is crucial for reliable alpha-particle counter measurements.
  • Traditional methods using travelling microscopes require manual focusing and pose health risks.

Purpose of the Study:

  • To compare the accuracy and usability of a traditional travelling microscope with a modern 3D coordinate measurement machine for defining alpha-particle counter geometry.
  • To evaluate the impact of source flatness on measurement accuracy.

Main Methods:

  • A travelling microscope with a linear gauge was used for manual distance measurements.
  • A 3D coordinate measurement machine with a CMOS camera and automated software focusing was employed.
  • Distance measurements were performed on drop-deposited alpha sources on glass and stainless steel disks.

Main Results:

  • Both devices demonstrated good mutual agreement in distance measurements.
  • The 3D coordinate measurement machine sampled more reference points, but accuracy did not significantly improve due to source imperfections.
  • The modern system offers enhanced ease of use and reduced health risks.

Conclusions:

  • Modern 3D coordinate measurement machines provide a user-friendly and safer alternative for establishing alpha-particle counter geometry.
  • Source surface topography remains a limiting factor in achieving higher measurement accuracy.