Patent ID: 9360368
Filing Date: 2016-06-07
CPC Classification: G01J

Claim Text:
1. A method of calibrating a polarimeter comprising the steps of: passing light through a first and a second polarizer disposed sequentially along an optical axis: measuring an intensity of light output from the second polarizer by a detector coupled to a data collection system; collecting the measured an intensity of light by a data collection system as first measured data: placing the polarimeter along the optical axis; removing the first polarizer from the optical axis; measuring an intensity of light output from the second polarizer, using the polarimeter coupled to a data collection system, after removing the first polarizer; collecting by the data collection system the intensity measured by the polarimeter as second measured data; replacing the second polarizer with the first polarizer along the optical axis; and measuring intensity of light output from the first polarizer after replacing the second polarizer with the first polarizer, using the polarimeter coupled to the data collection system; collecting by the data collection system the intensities measured by the polarimeter after replacing the second polarizer with the first polarizer as third measured data; using the first, second and third measured data to determine an extinction ratio of the polarimeter, calibrating the polarimeter; calibrating the polarimeter based on the determined extinction ratio.