.. index:: PLM contamination; Characterization

.. _char-telescope-contamination:

**CHAR-TEL-002:** PLM contamination
===================================

.. include:: definitions.rst

Parent requirement
------------------

Objective
---------

Contamination by volatile water ice will lead to a number of effects in the spectrophotometric data from absorption, interference and scattering.These can - in principle - be used to infer the conmtamination states of the telescope and instruments, i.e. the amount of water ice on a surface.

While the physical principles are known, the absolute amount of contamination of an optical element (or group of elements) will be difficult to determine in flight. Using a suitable combination of measurements with both instruments, it might be possible to constrain contamination to specific components, helping to fine-tune a decontamination procedure.

Cadence
-------

Monthly.

Observations
------------

Methodology / Uplink procedure
------------------------------

Targets and pointing constraints
--------------------------------

Instrument configuration
------------------------

Inter-operability constraints
-----------------------------

Dependencies
------------

Fulfilling
----------

Fulfilled by
------------

:ref:`calobs-block-pv-selfcal`

:ref:`calobs-block-f-selfcal`

:ref:`calobs-block-f-wide-survey`

Time-critical
-------------
No.

Validation
----------

Recovery
--------

In-orbit duration
-----------------
	 
Processing time
---------------

Processing input
----------------
:command:`Ground Processing Input Data`:

:command:`Data Description`:

Data volume
-----------

Processing tools
----------------

Processing element
------------------
DataModel:
`<https://gitlab.euclid-sgs.uk/>`_

Quality control parameters
--------------------------
DataModel:
`<https://gitlab.euclid-sgs.uk/>`_

Required accuracy, constraints
------------------------------

Processing method
-----------------

Processing output
-----------------

If possible, estimates of the absolute amount of contamination of a group of optical elements.

Contact person
--------------
Calibration Lead  

Status
------
|today| - In progress.

FLAG
----

Priority
--------

Observation record
------------------

Comments
--------

.. raw:: latex

   \clearpage