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.