358 lines
11 KiB
ReStructuredText
358 lines
11 KiB
ReStructuredText
Currently, ESBO-ETC only supports detectors of the type :ref:`imager`.
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.. code-block:: xml
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<sensor type="">
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Attributes:
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* | **type:** str
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| The type of the detector. Has to be one of [``Imager``].
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.. _imager:
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Imager
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------
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The Imager sensor type allows to model a generic imaging sensor which uses a pixel based array to create only spatially resolved images. The imager-component contains several parameters which are explained in the following.
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.. code-block:: xml
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:linenos:
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<sensor type="Imager">
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<f_number val="13" val_unit=""/>
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<pixel_geometry val="1024, 1024" val_unit="pix"/>
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<center_offset val="0.0, 0.0" val_unit="pix"/>
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<pixel>
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<quantum_efficiency val="data/ccd/QE.txt"/>
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<pixel_size val="6.5" val_unit="um"/>
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<dark_current val="0.6" val_unit="electron / (pix * s)"/>
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<sigma_read_out val="1.4" val_unit="electron(1/2) / pix"/>
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<well_capacity val="30000" val_unit="electron"/>
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</pixel>
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<photometric_aperture>
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<shape val="circle"/>
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<contained_energy val="80"/>
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<aperture_size val="100" val_unit="pix"/>
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</photometric_aperture>
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</sensor>
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f_number
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^^^^^^^^
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The working focal number of the instrument.
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.. code-block:: xml
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<f_number val="13" val_unit=""/>
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Attributes:
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* | **val:** float
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| The value of the working focal number of the instrument.
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* | **val_unit:** str, *optional* = ""
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| The unit of the working focal number of the instrument. This has to be emtpy (dimensionless).
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.. _pixel_geometry:
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pixel_geometry
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^^^^^^^^^^^^^^
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The geometry of the sensor's pixel array.
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.. code-block:: xml
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<pixel_geometry val="1024, 1024" val_unit="pix"/>
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Attributes:
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* | **val:** float
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| The geometry of the sensor's pixel array as a comma separated list of the number of pixels per dimension (X, Y).
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* | **val_unit:** str, *optional* = "pix"
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| The unit of the geometry of the sensor's pixel array. This has to be ``pix``.
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.. _center_offset:
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center_offset
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^^^^^^^^^^^^^
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The PSF's center offset from the arithmetical center of the detector array which is defined as half of the number of pixels per dimension as defined in :ref:`pixel_geometry`
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.. code-block:: xml
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<center_offset val="0.0, 0.0" val_unit="pix"/>
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Attributes:
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* | **val:** float
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| PSF's center offset as a comma separated list of the offset in pixels per dimension (X, Y).
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* | **val_unit:** str, *optional* = "pix"
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| The unit of the PSF's center offset. This has to be ``pix``.
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pixel
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^^^^^
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The pixel-container contains parameters which apply to all pixels of the sensor array.
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.. code-block:: xml
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:linenos:
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<pixel>
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<quantum_efficiency val="data/ccd/QE.txt"/>
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<pixel_size val="6.5" val_unit="um"/>
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<dark_current val="0.6" val_unit="electron / (pix * s)"/>
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<sigma_read_out val="1.4" val_unit="electron(1/2) / pix"/>
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<well_capacity val="30000" val_unit="electron"/>
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</pixel>
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quantum_efficiency
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""""""""""""""""""
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The quantum efficiency of a detector pixel.
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.. code-block:: xml
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<quantum_efficiency val="data/ccd/QE.txt"/>
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Attributes:
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* | **val:** (float, str)
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| Either the value of the quantum efficiency or the path to the file containing the quantum efficiency values. For details on the required file structure see also :ref:`reading_csv`.
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* | **val_unit:** str, *optional* = "electron / photon"
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| The unit of the edge length of a detector pixel. This has to be ``electron / photon``.
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pixel_size
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""""""""""
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The spatial size of each detector pixel. Each pixel is assumed to be of quadratic.
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.. code-block:: xml
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<pixel_size val="6.5" val_unit="um"/>
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Attributes:
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* | **val:** float
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| The value of the edge length of a detector pixel.
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* | **val_unit:** str, *optional* = "m"
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| The unit of the edge length of a detector pixel. This has to be one of [``m``, ``cm``, ``mm``, ``um``, ``nm``, ``pm``]. The default is ``m``.
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dark_current
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""""""""""""
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The dark current of a detector pixel.
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.. code-block:: xml
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<dark_current val="0.6" val_unit="electron / (pix * s)"/>
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Attributes:
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* | **val:** float
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| The value of the dark current of a detector pixel.
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* | **val_unit:** str, *optional* = "electron / (pix * s)"
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| The unit of the dark current of a detector pixel. This has to be ``electron / (pix * s)``.
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sigma_read_out
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""""""""""""""
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The read out noise of a detector pixel.
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.. code-block:: xml
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<sigma_read_out val="1.4" val_unit="electron(1/2) / pix"/>
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Attributes:
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* | **val:** float
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| The value of the read out noise of a detector pixel.
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* | **val_unit:** str, *optional* = "electron(1/2) / pix"
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| The unit of the read out noise of a detector pixel. This has to be ``electron(1/2) / pix``.
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well_capacity
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"""""""""""""
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The well capacity of a detector pixel.
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.. code-block:: xml
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<well_capacity val="30000" val_unit="electron"/>
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Attributes:
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* | **val:** float
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| The value of the well capacity of a detector pixel.
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* | **val_unit:** str, *optional* = "electron"
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| The unit of the well capacity of a detector pixel. This has to be ``electron``.
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photometric_aperture
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^^^^^^^^^^^^^^^^^^^^
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*optional*
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The photometric_aperture-container contains parameters for the photometric aperture of the observation. This container is only required, if the :ref:`target` has the shape ``point``.
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.. code-block:: xml
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:linenos:
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<photometric_aperture/>
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<shape val="circle"/>
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<contained_energy val="80"/>
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<aperture_size val="100" val_unit="pix"/>
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</photometric_aperture>
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shape
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"""""
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The shape of the photometric aperture which will be placed around the center of the PSF which is defined by :ref:`center_offset`. After the radius of the photometric aperture was calculated using a disk for the given :ref:`contained_energy`, this radius will be used as radius or edge length of the photometric aperture shape.
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.. code-block:: xml
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<shape val="circle"/>
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Attributes:
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* | **val:** str
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| The shape of the photometric aperture. This has to be one of [``circle``, ``square``].
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.. _contained_energy:
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contained_energy
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""""""""""""""""
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*optional*
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The energy to be contained within the photometric aperture. This value will used for the computation of the radius of the photometric aperture.
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.. code-block:: xml
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<contained_energy val="80"/>
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Attributes:
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* | **val:** (float, str)
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| The energy to be contained within the photometric aperture. This can be either the percentage of contained energy or one of [``Peak``, ``FWHM``, ``Min``].
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aperture_size
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""""""""""""""""
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*optional*
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The radius respectively the edge length of the photometric aperture in pixels. If this parameter is given, the :ref:`contained_energy` parameter will be ignored.
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.. code-block:: xml
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<aperture_size val="100" val_unit="pix"/>
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Attributes:
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* | **val:** float
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| The radius respectively the edge length of the photometric aperture.
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* | **val_unit:** str, *optional* = "pix"
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| The unit of the radius respectively the edge length of the photometric aperture. This has to be ``pix``.
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Heterodyne
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----------
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The heterodyne sensor type allows to model a generic DSB heterodyne radio receiver which uses an local oscillator and an mixer to create spectral images. The heterodyne-component contains several parameters which are explained in the following. All parameters are defined according to the `Guide to GREAT <https://www.sofia.usra.edu/science/proposing-and-observing/observers-handbook-cycle-9/6-great/61-specifications#PerformanceGREAT>`_.
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.. code-block:: xml
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:linenos:
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<sensor type="Heterodyne">
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<aperture_efficiency val="0.55" val_unit=""/>
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<main_beam_efficiency val="0.67" val_unit=""/>
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<receiver_temp val="1050" val_unit="K"/>
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<eta_fss val="0.97" val_unit=""/>
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<lambda_line val="157.774" val_unit="um"/>
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<lambda_local_oscillator val="158" val_unit="um"/>
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<kappa val="1" val_unit=""/>
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<n_on val="10" val_unit=""/>
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</sensor>
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aperture_efficiency
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^^^^^^^^^^^^^^^^^^^
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The aperture efficiency of the instrument.
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.. code-block:: xml
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<aperture_efficiency val="0.55" val_unit=""/>
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Attributes:
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* | **val:** float
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| The value of the aperture efficiency of the instrument.
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* | **val_unit:** str, *optional* = ""
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| The unit of the aperture efficiency of the instrument. This has to be emtpy (dimensionless).
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main_beam_efficiency
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^^^^^^^^^^^^^^^^^^^^
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The main beam efficiency of the instrument.
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.. code-block:: xml
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<main_beam_efficiency val="0.67" val_unit=""/>
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Attributes:
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* | **val:** float
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| The value of the main beam efficiency of the instrument.
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* | **val_unit:** str, *optional* = ""
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| The unit of the main beam efficiency of the instrument. This has to be emtpy (dimensionless).
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receiver_temp
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^^^^^^^^^^^^^
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The receiver's noise temperature.
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.. code-block:: xml
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<receiver_temp val="1050" val_unit="K"/>
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Attributes:
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* | **val:** float
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| The receiver's noise temperature.
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* | **val_unit:** str, *optional* = "K"
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| The unit of the receiver temperature. This has to be on of [``K``, ``Celsius``].
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eta_fss
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^^^^^^^
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The forward scattering efficiency of the detector.
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.. code-block:: xml
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<eta_fss val="0.97" val_unit=""/>
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Attributes:
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* | **val:** float
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| The forward scattering efficiency of the detector.
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* | **val_unit:** str, *optional* = ""
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| The unit of the forward scattering efficiency of the instrument. This has to be emtpy (dimensionless).
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lambda_line
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^^^^^^^^^^^
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The wavelength or frequency of the observed line.
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.. code-block:: xml
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<lambda_line val="157.774" val_unit="um"/>
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Attributes:
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* | **val:** float
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| The wavelength of the observed line.
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* | **val_unit:** str, *optional* = "m"
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| The unit of the observed line wavelength. This has to be on of [``nm``, ``um``, ``mm``, ``cm``, ``m``, ``Hz``, ``kHZ``, ``MHz``, ``GHz``, ``THz``].
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lambda_local_oscillator
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^^^^^^^^^^^^^^^^^^^^^^^
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The wavelength or frequency of the local oscillator. This parameter is optional. If no value is given, the noise temperature of the signal band is doubled.
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.. code-block:: xml
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<lambda_local_oscillator val="158" val_unit="um"/>
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Attributes:
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* | **val:** float
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| The wavelength of the local oscillator.
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* | **val_unit:** str, *optional* = "m"
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| The unit of the local oscillator wavelength. This has to be on of [``nm``, ``um``, ``mm``, ``cm``, ``m``, ``Hz``, ``kHZ``, ``MHz``, ``GHz``, ``THz``].
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kappa
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^^^^^
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The instrument's backend degradation factor.
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.. code-block:: xml
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<kappa val="1" val_unit=""/>
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Attributes:
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* | **val:** float
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| The instrument's backend degradation factor.
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* | **val_unit:** str, *optional* = ""
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| The unit of the backend degradation factor. This has to be emtpy (dimensionless).
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n_on
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^^^^
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The number of on-source observations per off-source observation.
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.. code-block:: xml
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<n_on val="10" val_unit=""/>
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Attributes:
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* | **val:** float
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| The number of on-source observations per off-source observation.
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* | **val_unit:** str, *optional* = ""
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| The unit of the number of on-source observations per off-source observation. This has to be emtpy (dimensionless).
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