BaldrApp

Simulating Baldr - the Zernike Wavefront Sensor (ZWFS) for VLTI/Asgard

Various modules and examples for testing end-to-end a ZWFS. Optionally includes, and extends the machinary of pyZelda to deal with specific details of Baldr, including its unique optics, coldstops, DMs and phasemasks.

python
import baldrapp

Installation

pip install baldrapp

This has a dependancy on a forked version of the pyZELDA package (https://github.com/courtney-barrer/pyZELDA) which must be installed seperately

pip install pyzelda@git+https://github.com/courtney-barrer/pyZELDA.git@b42aaea5c8a47026783a15391df5e058360ea15e

Alternatvely the project can be cloned or forked from the Github:

git clone https://github.com/courtney-barrer/BaldrApp

The pip installation was tested on only on python 3.12.7.

Older versions of the app also included:

• A PyQt application for end-to-end simulatations and visualization of Baldr operations (closed and open loop for a single telescope). The gui allows downloading of configuration files and telemetry. After pip installation try type in a terminal (warning: it takes 1-2 minutes to calibrate before the app will appear):

python -m baldrapp.apps.baldr_closed_loop_app.closed_loop_pyqtgraph

The app contains a command prompt that is exposed to the full python environment of the simulation. The default initialised mode is open loop with a weak rolling Kolmogorov atmosphere, and calibrated zonal matricies with zero gain. Some basic commands to test :

zwfs_ns.ctrl.HO_ctrl.ki += 0.4 # put some non-zero gains

dynamic_opd_input=False #turn off rolling atmosphere phasescreen

M2C_0 = DM_basis.construct_command_basis( basis= "Zernike", 
number_of_modes = 20, without_piston=True).T # build a DM basis

dm_disturbance = M2C_0[5]* 1e-1 #put a static disturbance on the DM

• A Streamlit application that simulates a Zernike Wavefront Sensor optical system using Fresnel diffraction propagation to model system mis-alignments. The default setup is for simulating the last (critical) part of the optical train of Baldr. After pip installation try type in a terminal:

python -m baldrapp.apps.baldr_alignment_app.Baldr_Fresnel_App

These have not been upgraded for recent versions of BaldrApp so may not run (yet).