Check the precision for the thickness and stop complaining for difference in the nm scale

src/pyFAI/detectors/_common.py

@@ -33,7 +33,7 @@
 __contact__ = "Jerome.Kieffer@ESRF.eu"
 __license__ = "MIT"
 __copyright__ = "European Synchrotron Radiation Facility, Grenoble, France"
-__date__ = "05/01/2026"
+__date__ = "27/01/2026"
 __status__ = "stable"
 
 import logging
@@ -264,7 +264,7 @@ def __init__(self,
 
         if isinstance(sensor, SensorConfig):
             if sensor not in self.SENSORS:
-                logger.warning("Sensor %s not in allowed SENSORS: %s", sensor, self.SENSORS)
+                logger.warning("Sensor %s not in allowed SENSORS: [%s].", sensor, "|".join([str(i) for i in self.SENSORS]))
             self.sensor = sensor
         elif sensor is None:
             logger.info("No sensor configuration provided; using default behaviour.")

src/pyFAI/detectors/sensors.py

@@ -37,7 +37,7 @@
 __contact__ = "Jerome.Kieffer@ESRF.eu"
 __license__ = "MIT"
 __copyright__ = "European Synchrotron Radiation Facility, Grenoble, France"
-__date__ = "05/01/2026"
+__date__ = "27/01/2026"
 __status__ = "stable"
 
 import os
@@ -179,6 +179,15 @@ def copy(self):
         return self.__class__(self.material,  # expected to be immutable
                               self.thickness)
 
+    def __eq__(self, other):
+        """Check for equality, especially for the thickness within 1µm"""
+        if (self.material == other.material):
+            if self.thickness and other.thickness and abs(self.thickness - other.thickness)<1e-6:
+                return True
+            else:
+                return self.thickness == other.thickness
+        return False
+
     def as_dict(self):
         """Like asdict, but with some more features:
         """

src/pyFAI/test/test_bug_regression.py

@@ -36,7 +36,7 @@
 __contact__ = "Jerome.Kieffer@esrf.fr"
 __license__ = "MIT"
 __copyright__ = "2015-2025 European Synchrotron Radiation Facility, Grenoble, France"
-__date__ = "05/01/2026"
+__date__ = "27/01/2026"
 
 import sys
 import os
@@ -733,6 +733,42 @@ def test_bug_2750(self):
         self.assertEqual(ai.detector, cpy.detector)
         self.assertEqual(ai.detector.sensor, cpy.detector.sensor)
 
+    def test_bug_2765(self):
+        """Check that loading a config file with approximate sensor thickness does not emit a warning"""
+        config_almost_good = {'poni_version': 2.1,
+                            'dist': 1.0,
+                            'poni1': 2.0,
+                            'poni2': 3.0,
+                            'rot1': 0.0,
+                            'rot2': 0.0,
+                            'rot3': 0.0,
+                            'detector': 'Pilatus1M',
+                            'detector_config': {'pixel1': 0.000172,
+                            'pixel2': 0.000172,
+                            'orientation': 3,
+                            'sensor': {'material': 'Si', 'thickness': 0.00031999999999999997}}}
+        config_not_good = {'poni_version': 2.1,
+                            'dist': 1.0,
+                            'poni1': 2.0,
+                            'poni2': 3.0,
+                            'rot1': 0.0,
+                            'rot2': 0.0,
+                            'rot3': 0.0,
+                            'detector': 'Pilatus1M',
+                            'detector_config': {'pixel1': 0.000172,
+                            'pixel2': 0.000172,
+                            'orientation': 3,
+                            'sensor': {'material': 'Si', 'thickness': 0.0003}}}
+        with self.assertLogs("pyFAI.detectors._common", level="WARNING") as cm:
+            _ = load(config_almost_good)
+            print(cm.output)
+            self.assertEqual(len(cm.output), 0, "No warning when almost good")
+
+            _ = load(config_not_good)
+            print(cm.output)
+            self.assertEqual(len(cm.output), 1, "Warning when not good")
+
+
 
 class TestBug1703(unittest.TestCase):
     """