adding a new poisson uncertainties estimator

src/modacor/modules/base_modules/poisson_uncertainties.py

@@ -0,0 +1,47 @@
+# src/modacor/dataclasses/processingdata.py
+# -*- coding: utf-8 -*-
+__author__ = "Brian R. Pauw"
+__copyright__ = "MoDaCor team"
+__license__ = "BSD3"
+__date__ = "22/05/2025"
+__version__ = "20250522.1"
+__status__ = "Development"  # "Development", "Production"
+
+
+from typing import Any
+
+import numpy as np
+
+from modacor.dataclasses.databundle import DataBundle
+from modacor.dataclasses.process_step import ProcessStep
+from modacor.dataclasses.process_step_describer import ProcessStepDescriber
+
+
+class PoissonUncertainties(ProcessStep):
+    """
+    Adding Poisson uncertainties to the data
+    """
+
+    documentation = ProcessStepDescriber(
+        calling_name="Add Poisson Uncertainties",
+        calling_id="PoissonUncertainties",
+        calling_module_path=__file__,
+        calling_version=__version__,
+        required_data_keys=["signal"],
+        works_on={"variances": ["Poisson"]},
+        step_keywords=["uncertainties", "Poisson"],
+        step_doc="Add Poisson uncertainties to the data",
+        step_reference="DOI 10.1088/0953-8984/25/38/383201",
+        step_note="This is a simple Poisson uncertainty calculation based on the signal intensity",
+    )
+
+    def calculate(self, data: DataBundle, **kwargs: Any):
+        """
+        Calculate the Poisson uncertainties for the data
+        """
+
+        # Get the data
+        signal = data["signal"].signal
+
+        # Add the variance to the data
+        data["signal"].variances["Poisson"] = np.clip(signal, 1, None)