公开(公告)号：US20170276548A1

公开(公告)日：2017-09-28

申请号：US15081244

申请日：2016-03-25

Applicant: Harris Corporation

Inventor： David Stanley SMITH ,  Paul MAURER

IPC: G01J5/00 ,  G01J5/12 ,  G01J5/62 ,  G01J5/28

CPC classification number: G01J5/62 ,  G01J1/044 ,  G01J1/08 ,  G01J5/0834 ,  G01J5/12 ,  G01J5/522 ,  G01J2001/083 ,  G01J2005/0048

Abstract: A method of estimating non-linearity in a response of an optical detector comprises emitting optical radiation at different intensities. The method includes, at each intensity: amplitude modulating the emitted optical radiation at a modulating frequency to produce amplitude modulated optical radiation; detecting the amplitude modulated optical radiation with the optical detector to produce a detected waveform; and generating a Fourier transform of the detected waveform that includes a fundamental frequency equal to the modulating frequency and harmonics thereof. The method further includes estimating the non-linearity in the response of the optical detector based on a change in an amplitude of a second harmonic of the fundamental frequency relative to an amplitude of the fundamental frequency across the Fourier transforms corresponding to the different intensities.