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Polar Coordinate System01:30

Polar Coordinate System

The polar coordinate system provides a natural way to describe points in the plane when distances and directions are more meaningful than horizontal and vertical displacements. It is especially useful for modeling non-rectangular regions such as circles and spirals, where symmetry about a center point is easier to express than it is in a rectangular grid. A familiar example is a ship’s plan position indicator, which marks detected targets as dots positioned relative to the ship at the display’s...
Polar Coordinates01:24

Polar Coordinates

The polar coordinate system offers an alternative to the Cartesian coordinate system for specifying points in a plane, using a distance and an angle instead of x and y coordinates. This system is particularly advantageous in situations involving circular or rotational symmetry, such as in physics or engineering problems involving waves, oscillations, or orbital paths.Defining Polar CoordinatesIn polar coordinates, a point is represented as P(r, ��), where r is the radial distance from a fixed...
Graphs of Polar Equations01:17

Graphs of Polar Equations

The polar coordinate system represents points using a distance from a central point (the pole) and an angle from a reference direction (the polar axis). Unlike rectangular coordinates, polar coordinates are ideal for graphing curves with radial symmetry or periodic behavior.Some general forms of graphs in polar coordinates include the following:Equation of a Circle (Centered at the Pole):A graph where the radius remains constant for all angles traces a circle centered at the pole:Equation of a...

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Related Experiment Video

Updated: Jun 12, 2026

Polarization-Sensitive Two-Photon Microscopy for a Label-Free Amyloid Structural Characterization
05:54

Polarization-Sensitive Two-Photon Microscopy for a Label-Free Amyloid Structural Characterization

Published on: September 8, 2023

Simplified polanret system for microscopy.

M Pluta

    Applied Optics
    |June 16, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A new polanret device simplifies phase contrast microscopy with a single polarizing ring, improving light economy and amplitude contrast. This innovation makes the technology more accessible and easier to manufacture for advanced imaging applications.

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    Imaging Plasma Membrane Deformations With pTIRFM

    Published on: April 2, 2014

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    Last Updated: Jun 12, 2026

    Polarization-Sensitive Two-Photon Microscopy for a Label-Free Amyloid Structural Characterization
    05:54

    Polarization-Sensitive Two-Photon Microscopy for a Label-Free Amyloid Structural Characterization

    Published on: September 8, 2023

    Imaging Plasma Membrane Deformations With pTIRFM
    12:28

    Imaging Plasma Membrane Deformations With pTIRFM

    Published on: April 2, 2014

    Area of Science:

    • Optical microscopy
    • Phase contrast imaging
    • Polarization microscopy

    Background:

    • Traditional polanret systems require multiple polarizers, increasing complexity and cost.
    • Limitations in light economy and amplitude contrast range exist in earlier designs.

    Purpose of the Study:

    • To develop a simplified and improved variable phase contrast and amplitude contrast device of the polanret type.
    • To enhance the manufacturability and performance of polanret systems.

    Main Methods:

    • Development of a novel polanret device utilizing a single polarizing ring.
    • Integration of the polarizing ring at the microscope objective exit pupil.
    • Co-conjugate alignment with an annular diaphragm in the phase contrast condenser.

    Main Results:

    • The new device is significantly easier to manufacture compared to Osterberg's original system.
    • Improved economy of light and an enhanced range of amplitude contrast were achieved.
    • The system requires precise placement of the polarizing ring at the objective's exit pupil.

    Conclusions:

    • The single-ring polanret device offers a more practical and efficient approach to variable phase and amplitude contrast microscopy.
    • This advancement holds potential for broader adoption in scientific imaging.
    • Further research may focus on optimizing the objective pupil interface for diverse applications.