CALPA

Position Angle Calibrate a Polarization Spectrum

Function

Position Angle Calibrate a Polarization Spectrum

Description

A polarization spectrum is corrected for wavelength dependent position angle zero point by applying a calibration curve obtained using the CALFITPA command.

This command is needed for polarimeters which are based on the use of a superachromatic half-wave plate, since such a plate shows significant cyclic wavelength variations of the position of its fast axis.

Parameters
1 INPUT TSP, 1D

The Polarization spectrum to be corrected.

2 CALIB TSP, 1D

The calibration spectrum.

3 OUTPUT TSP, 1D

The output corrected dataset.

Support

Jeremy Bailey, AAO

Version date

20/11/1991