halfwave_model#
- astropop.polarimetry.halfwave_model(psi, q, u, zero=None)#
Compute polarimetry z(psi) model for half wavelength retarder.
Z(psi) = Q*cos(4*psi) + U*sin(4*psi)
- Parameters:
- psi: array_like
Array of retarder positions in degrees.
- q, u: float
Stokes parameters
- zero: float (optional)
Zero angle of the retarder position.