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Related Concept Videos

Toroids01:27

Toroids

A toroid is a closely wound donut-shaped coil constructed using a single conducting wire. In general, it is assumed that a toriod consists of multiple circular loops perpendicular to its axis.
When connected to a supply, the magnetic field generated in the toroid has field lines circular and concentric to its axis. Conventionally, the direction of this magnetic field is expressed using the right-hand rule. If the fingers of the right hand curl in the current direction, the thumb points in the...

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Related Experiment Video

Updated: Jul 6, 2026

Characterization of Surface Modifications by White Light Interferometry: Applications in Ion Sputtering, Laser Ablation, and Tribology Experiments
11:47

Characterization of Surface Modifications by White Light Interferometry: Applications in Ion Sputtering, Laser Ablation, and Tribology Experiments

Published on: February 27, 2013

Profilometry of toroidal surfaces with an improved ronchi test.

S Royo, J Arasa, C Pizarro

    Applied Optics
    |March 21, 2008
    PubMed
    Summary

    This study presents a Ronchi test method for measuring non-symmetrical surfaces, specifically toroidal surfaces. The technique reconstructs 3D profiles with micrometric accuracy, enabling detailed surface analysis.

    Area of Science:

    • Optical metrology
    • Surface profilometry
    • Aspheric optics measurement

    Background:

    • Non-rotationally symmetrical surfaces, such as toroidal surfaces, pose challenges for traditional profilometric measurement techniques.
    • Accurate characterization of these surfaces is crucial in various optical applications.

    Purpose of the Study:

    • To implement and apply the Ronchi test for the profilometric measurement of toroidal surfaces.
    • To demonstrate the capability of reconstructing the 3D profile of toroidal surfaces with high accuracy.

    Main Methods:

    • Adaptation of the Ronchi test for non-rotationally symmetrical surfaces.
    • Detailed description of the experimental setup and data-processing procedures.
    • Measurement of surface parameters (radius of curvature, principal meridians, vertex position) using local surface normals.

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    Published on: December 29, 2015

    Related Experiment Videos

    Last Updated: Jul 6, 2026

    Characterization of Surface Modifications by White Light Interferometry: Applications in Ion Sputtering, Laser Ablation, and Tribology Experiments
    11:47

    Characterization of Surface Modifications by White Light Interferometry: Applications in Ion Sputtering, Laser Ablation, and Tribology Experiments

    Published on: February 27, 2013

    Potentiodynamic Corrosion Testing
    08:43

    Potentiodynamic Corrosion Testing

    Published on: September 4, 2016

    Label-free Single Molecule Detection Using Microtoroid Optical Resonators
    08:53

    Label-free Single Molecule Detection Using Microtoroid Optical Resonators

    Published on: December 29, 2015

    Main Results:

    • Successful application of the Ronchi test to toroidal surface measurement.
    • Reconstruction of the 3D toroidal surface profile with micrometric accuracy.
    • Calculation of sub-micrometric surface details using surface-fitting procedures.

    Conclusions:

    • The implemented Ronchi test provides an effective method for profilometric measurement of toroidal surfaces.
    • The technique allows for accurate determination of key surface parameters and detailed profile reconstruction.
    • The sampling point density can be adjusted to meet specific measurement requirements.