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Related Concept Videos

Relative Motion Analysis - Velocity01:24

Relative Motion Analysis - Velocity

A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
Distance Measurements by Taping01:18

Distance Measurements by Taping

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...
Inertial Frames of Reference01:03

Inertial Frames of Reference

Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with constant...
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
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Non-inertial Frames of Reference01:27

Non-inertial Frames of Reference

A reference frame accelerating or decelerating relative to an inertial frame is a non-inertial frame. To help understand this, consider what taking off in an airplane, turning a corner in a car, riding a merry-go-round, and the circular motion of a tropical cyclone all have in common. All these systems are accelerating, decelerating, or rotating relative to the Earth; hence, they all are non-inertial frames. All these systems exhibit inertial forces, which merely seem to arise from motion,...
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Average and Instantaneous Velocity Vectors

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Related Experiment Video

Updated: Jul 15, 2026

Meso-Scale Particle Image Velocimetry Studies of Neurovascular Flows In Vitro
08:00

Meso-Scale Particle Image Velocimetry Studies of Neurovascular Flows In Vitro

Published on: December 3, 2018

Low-coherence self-referencing velocimetry.

Andreas Kempe1, Stefan Schlamp, Thomas Rösgen

  • 1Institute of Fluid Dynamics, ETH Zürich, Zürich, Switzerland. kempe@ifd.mavt.ethz.ch

Optics Letters
|April 19, 2007
PubMed
Summary

Low-coherence self-referencing velocimetry accurately measures fluid velocity relative to a reference surface. This optical technique offers high spatial resolution for particle-laden flows.

Area of Science:

  • Fluid dynamics
  • Optical measurement techniques
  • Velocimetry

Background:

  • Measuring fluid velocity, particularly in particle-laden flows, is crucial for understanding complex phenomena.
  • Existing methods may have limitations in spatial resolution or reference frame dependency.

Purpose of the Study:

  • To introduce and demonstrate a novel optical technique for measuring relative velocity.
  • To achieve high spatial resolution measurements in particle-laden flows.

Main Methods:

  • Utilizes low-coherence light interferometry with a variable optical delay.
  • Employs an acousto-optical modulator for signal processing.
  • Scans measurement location by adjusting optical delay, achieving tens of micrometers spatial resolution.

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High-speed Particle Image Velocimetry Near Surfaces
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High-speed Particle Image Velocimetry Near Surfaces

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Automated 3D Optical Coherence Tomography to Elucidate Biofilm Morphogenesis Over Large Spatial Scales

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Related Experiment Videos

Last Updated: Jul 15, 2026

Meso-Scale Particle Image Velocimetry Studies of Neurovascular Flows In Vitro
08:00

Meso-Scale Particle Image Velocimetry Studies of Neurovascular Flows In Vitro

Published on: December 3, 2018

High-speed Particle Image Velocimetry Near Surfaces
11:59

High-speed Particle Image Velocimetry Near Surfaces

Published on: June 24, 2013

Automated 3D Optical Coherence Tomography to Elucidate Biofilm Morphogenesis Over Large Spatial Scales
09:56

Automated 3D Optical Coherence Tomography to Elucidate Biofilm Morphogenesis Over Large Spatial Scales

Published on: August 21, 2019

Main Results:

  • Successfully demonstrated proof-of-principle measurements.
  • Validated the technique in Taylor-Couette flow.
  • Showcased the ability to measure velocity relative to a moving surface.

Conclusions:

  • Low-coherence self-referencing velocimetry is a viable method for precise fluid velocity measurements.
  • The technique offers high spatial resolution and flexibility in reference frame selection.
  • Potential applications in various fluid dynamics studies.