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Related Concept Videos

Centroid of a Body01:16

Centroid of a Body

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The centroid is an important concept in engineering, physics, and mechanics. It is the geometric center of a body. It always lies within the body except in cases with holes or cavities. When the material that a body is composed of is uniform or homogeneous, the centroid coincides with its center of mass or the center of gravity.
For a homogeneous body with constant density, the centroid can usually be found using equations representing a balance of the moments of the body's volume. If the...
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Centroid for the Paraboloid of Revolution01:16

Centroid for the Paraboloid of Revolution

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The paraboloid of revolution is an axially symmetric surface generated by rotating a parabola around its axis. This shape has several applications in mechanical engineering due to its advantageous structural properties, such as strength against stress concentration points and rotational symmetry.
The centroid for the paraboloid of revolution is the point where all the mass of the paraboloid is concentrated. This centroid is important for engineering applications, as it determines how forces are...
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Centroid of a Body: Problem Solving01:03

Centroid of a Body: Problem Solving

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The centroid of a body is a crucial concept in engineering and physics. Finding the centroid of a body can help determine its stability, its balance point, and even its design. In this context, consider a thin wire bent in the form of a quarter circular arc. Polar coordinates are used to calculate the centroid. The wire is first divided into small differential elements of a length equal to the radius multiplied by the differential angle.
The x-coordinates and y-coordinates of each element's...
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Position and Displacement01:31

Position and Displacement

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The position of an object defines its location relative to a convenient frame of reference at any particular time. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference, and we often describe the position of an object as it relates to stationary objects on Earth. For example, a rocket launch could be described in terms of the position of the rocket with respect to Earth as a whole. On the other...
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Displacement Current01:19

Displacement Current

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Ampère's law, in its usual form, does not work in places where the current changes with time and is not steady. Thus, Maxwell suggested including an additional contribution, called the displacement current, Id, to the real conduction current I.
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Distribution and Dispersion00:54

Distribution and Dispersion

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To understand intra-specific interactions in populations, scientists measure the spatial arrangement of species individuals. This geographic arrangement is known as the species distribution or dispersion. Highly territorial species exhibit a uniform distribution pattern, in which individuals are spaced at relatively equal distances from one another. Species that are highly tied to particular resources, such as food or shelter, tend to concentrate around those resources, and thus exhibit a...
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Dispersion of Nanomaterials in Aqueous Media: Towards Protocol Optimization
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Dispersion of Nanomaterials in Aqueous Media: Towards Protocol Optimization

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Chromatic Confocal Displacement Sensor with Optimized Dispersion Probe and Modified Centroid Peak Extraction

Jiao Bai1,2, Xinghui Li3, Xiaohao Wang1

  • 1Division of Advanced Manufacturing, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.

Sensors (Basel, Switzerland)
|August 21, 2019
PubMed
Summary
This summary is machine-generated.

Chromatic confocal technology (CCT) offers accurate, contactless structure profile measurement. A modified algorithm improves stability and repeatability for precise displacement measurements, demonstrating high feasibility.

Keywords:
Fresnel lenscalibration experimentchromatic confocal technologydispersion probemodified centroid peak extraction algorithm

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Area of Science:

  • Optics and Photonics
  • Metrology and Measurement Science

Background:

  • Chromatic confocal technology (CCT) is a key method for non-contact, high-accuracy structure profile measurement.
  • Challenges exist in extracting focal wavelength due to noise fluctuations, impacting measurement stability.

Purpose of the Study:

  • To propose and optimize a dispersion probe for CCT using commercial lenses.
  • To enhance the stability and accuracy of CCT systems through algorithm modification.
  • To demonstrate the system's performance in displacement measurement and profile analysis.

Main Methods:

  • Development and optimization of a dispersion probe with commercial refractive index lenses.
  • Implementation of a modified centroid peak extraction algorithm with virtual pixel interpolation.
  • Experimental testing of the CCT system for displacement measurement accuracy and repeatability.

Main Results:

  • The optimized probe offers 0.3× magnification and a 400 μm dispersion range.
  • The modified algorithm significantly improved measurement stability.
  • Calibration repeatability achieved ±0.3 μm, with a standard deviation as low as 0.009 μm.

Conclusions:

  • The modified CCT system demonstrates improved stability and high accuracy for displacement measurements.
  • The system is highly feasible and efficient for measuring section profiles, as shown with a Fresnel lens.