A new method for linear camera calibration and nonlinear distortion correction

2006 ◽  
Author(s):  
Jun Wang ◽  
Naiguang Lu ◽  
Mingli Dong ◽  
Chunhui Niu
Keyword(s):  
Camera Calibration ◽  
Nonlinear Distortion ◽  
Distortion Correction ◽  
New Method

scholarly journals Algorithm of FBG Spectrum Distortion Correction for Optical Spectra Analyzers with CCD Elements

2021 ◽  
Author(s):  
Vladimir Anfinogentov ◽  
Kamil Karimov ◽  
Artem Kuznetsov ◽  
Ilnur Nureev ◽  
Airat Sakhabutdinov ◽  
...  
Keyword(s):  
Nonlinear Distortion ◽  
Spectrum Analyzer ◽  
Distortion Correction ◽  
Optical Spectrum Analyzer ◽  
Measuring Systems ◽  
Central Wavelength ◽  
Charge Coupled Device ◽  
Nonlinear Distortions ◽  
Mathematical Processing ◽  
Nonlinear Spectrum

Abstract: Nonlinear spectrum distortions are caused by the peculiarities of the operation of charge-coupled device elements (CCD), in which the signal exposition time (TINT) is one of the significant parameters. A change of TINT on a CCD leads to a nonlinear distortion of the resulting spectrum. Nonlinear distortion of the spectrum, in its turn, leads to errors in determining the central wavelength of Fiber Bragg Gratings (FBG) and spectrally sensitive sensors, which, in general, negatively affects the accuracy of measuring systems. The paper proposes an algorithm for correcting nonlinear distortions of the spectrum obtained on a spectrum analyzer using CCD as a receiver. It is shown that preliminary calibration of the optical spectrum analyzer with subsequent mathematical processing of the signal makes it possible to make corrections in the resulting spectrum, thereby leveling the errors caused by measurements at different TINT.

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