feat(extractors): add annular aperture support to trajectory extractor

optimization_engine/extractors/extract_zernike_trajectory.py

@@ -249,6 +249,7 @@ class ZernikeTrajectoryExtractor:
         reference_angle: float = 20.0,
         unit: str = 'mm',
         n_modes: int = DEFAULT_N_MODES,
+        inner_radius: Optional[float] = None,  # Annular aperture inner radius (mm)
     ):
         self.op2_path = Path(op2_file)
         self.focal_length = focal_length
@@ -256,6 +257,7 @@ class ZernikeTrajectoryExtractor:
         self.unit = unit
         self.nm_scale = UNIT_TO_NM.get(unit, 1e6)  # Default mm -> nm
         self.n_modes = n_modes
+        self.inner_radius = inner_radius  # For annular aperture
 
         # Find geometry file
         if bdf_file:
@@ -338,6 +340,18 @@ class ZernikeTrajectoryExtractor:
         dy = disp[:, 1]
         dz = disp[:, 2]
 
+        # Apply annular aperture mask if inner_radius specified
+        if self.inner_radius is not None:
+            r = np.sqrt(x**2 + y**2)
+            annular_mask = r >= self.inner_radius
+            x = x[annular_mask]
+            y = y[annular_mask]
+            z = z[annular_mask]
+            dx = dx[annular_mask]
+            dy = dy[annular_mask]
+            dz = dz[annular_mask]
+            node_ids = node_ids[annular_mask]
+
         # Compute WFE (surface error * 2 for reflective surface)
         # For now, use Z-displacement (can add OPD correction if focal_length provided)
         surface_error = dz  # In original units (mm)
@@ -542,6 +556,7 @@ def extract_zernike_trajectory(
     focal_length: Optional[float] = None,
     reference_angle: float = 20.0,
     unit: str = 'mm',
+    inner_radius: Optional[float] = None,
 ) -> Dict[str, Any]:
     """
     Extract Zernike trajectory metrics from OP2 file.
@@ -556,6 +571,7 @@ def extract_zernike_trajectory(
         focal_length: Parabola focal length for OPD correction (mm)
         reference_angle: Reference angle (default 20°)
         unit: Displacement unit in OP2 ('mm', 'm', 'um', 'nm')
+        inner_radius: Inner radius for annular aperture (mm), excludes central hole
 
     Returns:
         Dict with trajectory analysis results including:
@@ -572,6 +588,7 @@ def extract_zernike_trajectory(
         focal_length=focal_length,
         reference_angle=reference_angle,
         unit=unit,
+        inner_radius=inner_radius,
     )
 
     return extractor.extract_trajectory(subcases=subcases, angles=angles)