quarterwave_model

astropop.polarimetry.quarterwave_model(psi, q, u, v, zero=0)

Compute polarimetry z(psi) model for quarter wavelength retarder.

Z(psi) = Q*cos(2psi)**2 + U*sin(2psi)*cos(2psi) - V*sin(2psi)

Parameters:

psi: array_like

Array of retarder positions in degrees.

q, u, v: float

Stokes parameters

zero: float

Zero position of the retarder in degrees.