ppops.geometry
Handles POPS geometry and polarization calculations.
This module includes functions for computing geometric parameters related to light scattering from the particle-laser interaction zone to the POPS mirror. It also calculates polarization weighting factors (s- and p-components) for the instrument’s optical collection efficiency.
Functions: - ptz2r_sc(OpticalParticleSpectrometer, phi, theta): Computes mirror intersection geometry, maximum azimuthal angle, and polarization weights.
Functions
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Compute POPS mirror geometry and polarization weighting. |
Module Contents
- ppops.geometry.ptz2r_sc(ops, phi, theta)[source]
Compute POPS mirror geometry and polarization weighting.
This function calculates the intersection of scattered light rays with the spherical POPS mirror and determines polarization weighting factors (s- and p-polarization) based on instrument geometry.
x - perpendicular to laser propagation direction y - laser propagation direction z - vertical direction (positive is down)
- Parameters:
ops (OpticalParticleSpectrometer) – Instance of the OpticalParticleSpectrometer class.
phi (np.ndarray) – Azimuthal scattering angles [radians]. Shape: (n,)
theta (np.ndarray) – Polar scattering angles [radians]. Shape: (n,)
- Returns:
rp (np.ndarray) – Positive intersection distances [mm]. Shape: (n,)
rm (np.ndarray) – Negative intersection distances (unphysical, retained for completeness). Shape: (n,)
x (np.ndarray) – Cartesian coordinates of intersection vectors. Shape: (n, 3)
phi_max (np.ndarray) – Maximum azimuthal half-angles. Shape: (n,)
ws (np.ndarray) – s-polarization weighting factors (perpendicular). Shape: (n,)
wp (np.ndarray) – p-polarization weighting factors (parallel). Shape: (n,)
obf (np.ndarray) – Obliquity factors (cosine of incidence angle). Shape: (n,)