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Point

The Point field probe is a powerful tool with inherent algorithms to process data and record the data in a useful and common format. The Point field probe is similar to the "Boxed Region" field probe, but it encompasses and processes data from a single point, rather than several points.

For calculating the electromagnetic fields, EMA3D can perform a running bandwidth average on the field data. The bandwidth averaging percentage can be adjusted in the Settings menu, if desired.

Defining a Point probe

  1. Click Field Probe Field Probe Image 16 within the Probes section under the EMA3D tab in the ribbon. Click Point in the drop-down list.

    point probe selection

    Alternatively, right click Probes in the Simulation Tree. Select Probe Field Image 16 Field Probe and then Point from the pop-up menus.

    point probe 4

  2. The default probe field type is Electric, suitable to measure the electric field in the assigned point. In order to measure the magnetic field, change the probe field type to Magnetic in the Properties panel. In the properties panel, the time properties can also be adjusted. The meaning of each property can be found in the table at the bottom of this page.

    point probe properties

  3. Select the point to probe in the model window - only points that match up with a defined point in the model geometry can be selected (e.g., a corner, a line midpoint, or a user-drawn point). Selectable points will be highlighted in green when hovered over.

    point probe

  4. Once selected, the point probe will appear in the model window as a large blue dot.

    point probe 2

  5. The probe should now be visible in the model window and should be added to the Simulation Tree under the Probes node.

    point probe 3

  6. The probe can be renamed or deleted at any time by right clicking it in the Simulation Tree. Additionally, the probe can be edited by double clicking its name in the Simulation Tree.

  7. To visualize the Point Probe results, see here.

Point Probe Properties

Entry

Meaning

Field Type

The field quantity to measure. It can be set to Electric or Magnetic to measure the electric field or the magnetic field

Start [s]

The time the probe starts recording data. The default start time matches the simulation start time. Start can be changed only if the field Match Domain is set to False (White text indicates field set to False, blue text indicates field set to True)

Step [s]

To which domain to match the probe time step:

  • Domain matches the probe time step to the FDTD domain time step

  • Frequency sets the probe time step such that it captures up to the highest supported frequency of the domain (this time step is coarser than the Domain time step and results in smaller files)

  • False allows the user to set the probe time step value manually

End [s]

The time the probe stops recording data. The default end time matches the simulation end time. End can be changed only if the field Match Domain is set to False (White text indicates field set to False, blue text indicates field set to True)

Skip

The number of time steps between probe data being written out (e.g., setting Skip to 2 will record every other time step)

See Also

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