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Related Concept Videos

Pressure Gauges01:20

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Most pressure gauges, like those on scuba tanks, are calibrated to read zero at atmospheric pressure. Readings from such gauges are called the gauge pressure, which is the pressure relative to atmospheric pressure. When the pressure inside the tank exceeds atmospheric pressure, the gauge reports a positive value. Some gauges are designed to measure negative pressure. For example, many physics experiments must take place in a vacuum chamber, a rigid chamber from which some of the air is pumped...
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Manufacture of Concrete Masonry Units01:27

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The process of manufacturing concrete masonry units begins by mixing stiff concrete composed of Portland cement, aggregates, and water. This mixture is then poured into metal molds. To ensure the concrete settles uniformly and to avoid separation of its components, the mixture in the molds is subjected to vibration. Shortly after, the still-wet blocks are removed from the molds and placed on racks.
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Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

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The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
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Design Example: Dimensioning of Concrete Masonry Construction01:13

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For the construction of a storeroom using concrete masonry units, it's essential to align the dimensions of the structure with the actual sizes of the blocks and the intended mortar joints. On the site in question, there's a stockpile of concrete masonry blocks with a nominal size of eight by eight by sixteen inches, which are to be used in the construction of the storeroom.
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Measurements of Strain01:27

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Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
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Measurement of Fluid Pressure01:16

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Fluid pressure is commonly measured using devices called manometers, which rely on liquid columns to indicate pressure differences. The height of a liquid column in a manometer reflects the pressure exerted by the fluid, providing a simple yet effective means of measurement. Different types of manometers serve specific purposes based on their configurations and the type of fluids involved.
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Gauge Blocks - A Zombie Technology.

Ted Doiron1

  • 1National Institute of Standards and Technology, Gaithersburg, MD 20899.

Journal of Research of the National Institute of Standards and Technology
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Summary
This summary is machine-generated.

Gauge blocks have long been used for length traceability. Advances in measurement technology now allow for new end standards, improving accuracy and usefulness beyond traditional gauge blocks.

Keywords:
end standardgage blocksprocess controlstabilitytechnical obsolescencethermal expansion

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Area of Science:

  • Metrology
  • Mechanical Engineering
  • Materials Science

Background:

  • Gauge blocks have been the standard for length traceability for over a century.
  • Their historical dominance was due to cost-effectiveness and the limited range of precision gauging systems.

Purpose of the Study:

  • To explore the development of new end standards.
  • To leverage advancements in measurement technology to enhance gauging systems.
  • To move beyond the limitations of traditional gauge blocks.

Main Methods:

  • Analysis of historical metrology practices.
  • Evaluation of recent advancements in long-range sensor technology.
  • Conceptualization of novel end-standard designs.

Main Results:

  • Modern sensors eliminate the need for gauge block wringing.
  • This relaxation of requirements opens opportunities for innovation in end standards.
  • New end standards can offer increased accuracy and utility.

Conclusions:

  • The traditional role of gauge blocks is diminishing due to technological progress.
  • There is a significant opportunity to develop superior end standards.
  • Future gauging systems can benefit from these new developments in metrology.