.. auto-generated by script ../../../../utils/nxdl2rst.py from the NXDL source ../../../../contributed_definitions/NXfresnel_zone_plate.nxdl.xml

.. index::
    ! NXfresnel_zone_plate (contributed definition)
    ! fresnel zone plate (contributed definition)
    see: fresnel zone plate (contributed definition); NXfresnel_zone_plate

.. _NXfresnel_zone_plate:

====================
NXfresnel_zone_plate
====================

**Status**:

  contributed definition, extends :ref:`NXobject`, version 1.0

**Description**:

  description for a fresnel zone plate

**Symbols**:

  No symbol table

**Groups cited**:
  :ref:`NXgeometry`

.. index:: NXgeometry (base class); used in contributed definition

**Structure**:

  .. index:: focus_parameters (data field)

  **focus_parameters**: :ref:`NX_FLOAT <NX_FLOAT>`

    list of polynomial coefficients describing the focal length of the zone plate, in increasing order.

  .. index:: outer_diameter (data field)

  **outer_diameter**: :ref:`NX_FLOAT <NX_FLOAT>` {units=\ :ref:`NX_LENGTH <NX_LENGTH>`}


  .. index:: outermost_zone_width (data field)

  **outermost_zone_width**: :ref:`NX_FLOAT <NX_FLOAT>` {units=\ :ref:`NX_LENGTH <NX_LENGTH>`}


  .. index:: central_stop_diameter (data field)

  **central_stop_diameter**: :ref:`NX_FLOAT <NX_FLOAT>` {units=\ :ref:`NX_LENGTH <NX_LENGTH>`}


  .. index:: fabrication (data field)

  **fabrication**: :ref:`NX_CHAR <NX_CHAR>`

    how zone plate was manufactured

    Any of these values: ``etched`` | ``plated`` | ``zone doubled``

  .. index:: zone_height (data field)

  **zone_height**: :ref:`NX_FLOAT <NX_FLOAT>` {units=\ :ref:`NX_LENGTH <NX_LENGTH>`}


  .. index:: zone_material (data field)

  **zone_material**: :ref:`NX_CHAR <NX_CHAR>`

    Material of the zones themselves

  .. index:: zone_support_material (data field)

  **zone_support_material**: :ref:`NX_CHAR <NX_CHAR>`

    Material present between the zones. This is usually only present for the "zone doubled" fabrication process

  .. index:: central_stop_material (data field)

  **central_stop_material**: :ref:`NX_CHAR <NX_CHAR>`


  .. index:: central_stop_thickness (data field)

  **central_stop_thickness**: :ref:`NX_FLOAT <NX_FLOAT>` {units=\ :ref:`NX_LENGTH <NX_LENGTH>`}


  .. index:: mask_thickness (data field)

  **mask_thickness**: :ref:`NX_FLOAT <NX_FLOAT>` {units=\ :ref:`NX_LENGTH <NX_LENGTH>`}


  .. index:: mask_material (data field)

  **mask_material**: :ref:`NX_CHAR <NX_CHAR>`

    If no mask is present, set mask_thickness to 0 and omit the mask_material field

  .. index:: support_membrane_material (data field)

  **support_membrane_material**: :ref:`NX_CHAR <NX_CHAR>`


  .. index:: support_membrane_thickness (data field)

  **support_membrane_thickness**: :ref:`NX_FLOAT <NX_FLOAT>` {units=\ :ref:`NX_LENGTH <NX_LENGTH>`}


  **(geometry)**: :ref:`NXgeometry`

    "Engineering" position of the fresnel zone plate

**Source**:
  Automatically generated from https://github.com/nexusformat/definitions/blob/master/contributed_definitions/NXfresnel_zone_plate.nxdl.xml