Flamingos 2 Probe Detector

This package contains a single script used to detect the position of the Flamingos 2 Guide Probe with sub-pixel accuracy. For that, it uses several morphological operations available inside the scipy.ndimage package.

The probe position, for now, is obtained using Center of Mass. That means that the whole probe image should be displayed. If the Probe Image touches the edge of the field of view, the results are unpredictable.

Requirements

Before you install this package, make sure your Python environment has all the required dependencies:

• Python 3
• astropy
• matplotlib
• numpy
• scipy
• opencv2

The best way of having all of them at once is installing Anaconda and AstroConda.

Install

Once you are inside a conda environment, you can install this package by simply typing:

   # Make sure you activate your virtual environment
   $ source activate $MYENV  

   # Install using pip
   $ pip install f2_probe_detector

It is highly recommended that you install this package inside a Anaconda virtual environment. If possible, install is inside your "astroconda" venv.

Running

To get information about how to run this script, you can type:

   $ get_f2_probe_position --help 

   $ get_f2_probe_position file_1.fits file_2.fits ... file_n.fits

   filename                                 x          y         
--------------------------------------------------------------
...est_get_f2_probe_position/file_1.fits 1091.43815  583.93075
...est_get_f2_probe_position/file_2.fits 1091.43815  583.93075
...est_get_f2_probe_position/file_3.fits 1091.43815  583.93075
..._get_f2_probe_position/test_data.fits 1091.43815  583.93075

or

   $ get_f2_probe_position file_*.fits

   filename                                 x          y         
--------------------------------------------------------------
...est_get_f2_probe_position/file_1.fits 1091.43815  583.93075
...est_get_f2_probe_position/file_2.fits 1091.43815  583.93075
...est_get_f2_probe_position/file_3.fits 1091.43815  583.93075
..._get_f2_probe_position/test_data.fits 1091.43815  583.93075 

Data Acquisition

The code may be sensitive to strong changes in exposure time, readout mode, etc. So the user may want to keep the data as uniform as possible. For that, here is the configuration used in most of the tests:

Flamingos2 component

• Filter: K-short
• Read Mode: Bright
• Exposure Time: 12 s
• Disperser: None
• Lyot Wheel: f/16 (open)

Sequence component: Manual Flat Daytime Calibration

• Lamp: IR grey body - high
• Shutter: closed
• Filter: ND4-5
• Diffuser: IR
• Coadds: 1. (Default/Only mode for F2)

Known Issues

1. get_f2_probe_position will not fail if cannot find a probe. If you get a very weird value, check the image.
2. get_f2_probe_position will not work if the probe shadow touches the edge.