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Leveling Equipment01:18

Leveling Equipment

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As leveling involves measuring vertical distances relative to a horizontal line of sight, it requires a graduated rod, called a level rod, for vertical measurements and an instrument called a level for a horizontal sight line. A level includes a high-powered telescope with a mechanism for leveling to ensure the line of sight is horizontal when the bubble in the spirit level is centered. Leveling rods, made of wood, metal, or fiberglass, are graduated in feet or meters and commonly used in two-...
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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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Two Components: Liquid–Liquid Systems01:27

Two Components: Liquid–Liquid Systems

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A pressure-composition phase diagram explicitly describes the behavior of an ideal solution of two volatile liquids under varying pressures and compositions. A pressure-composition diagram has two main curves. The bubble point curve represents the plot of pressure versus liquid mole fraction. It indicates the pressure at which the first bubble of vapor forms from the liquid phase as the system pressure decreases.The dew point curve is the pressure versus vapor mole fraction. It indicates the...
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Author Spotlight: A Stable Phantom Material for Optical and Acoustic Imaging
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Optical system for liquid level measurements.

D Melchionni1, M Norgia1

  • 1Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, Milan, Italy.

The Review of Scientific Instruments
|August 3, 2014
PubMed
Summary
This summary is machine-generated.

A new laser instrument uses a laser diode

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Area of Science:

  • Instrumentation and Measurement
  • Optoelectronics
  • Fluid Dynamics

Background:

  • Non-contact liquid level measurement is crucial in various industrial processes.
  • Traditional methods can be limited by accuracy, speed, or invasiveness.
  • Developing advanced optical techniques offers potential for improved performance.

Purpose of the Study:

  • To develop a novel, low-cost laser instrument for real-time, non-contact liquid level measurement.
  • To investigate the self-mixing effect in a laser diode for distance determination.
  • To optimize the instrument for various liquid surface conditions, including ripples.

Main Methods:

  • Utilized the self-mixing interference effect in a wavelength-modulated laser diode.
  • Employed a high-speed Field Programmable Gate Array (FPGA) for data acquisition and processing.
  • Studied optical characteristics of liquid surfaces (flat and rippled) to optimize configuration.

Main Results:

  • The instrument achieves a resolution better than 1 mm for distances up to 50 cm.
  • Real-time tracking of liquid filling processes at speeds of 2.5 cm/s is demonstrated.
  • The system shows robustness for measurements on moving or rippled liquid surfaces.

Conclusions:

  • The developed laser instrument provides an accurate and efficient solution for non-contact liquid level monitoring.
  • The self-mixing laser diode technique, coupled with high-speed FPGA processing, enables reliable measurements in dynamic conditions.
  • This low-cost instrument has significant potential for industrial applications requiring precise liquid level control.