Anfinogentov Vladimir, Karimov Kamil, Kuznetsov Artem, Morozov Oleg G, Nureev Ilnur, Sakhabutdinov Airat, Lipatnikov Konstantin, Hussein Safaa M R H, Ali Mustafa H
Department of Radiophotonics and Microwave Technologies, Kazan National Research Technical University Named after A.N. Tupolev-KAI, K. Marx Str. 10, 420111 Kazan, Russia.
Department of physics, College of Education for Pure Sciences, University of Karbala, Karbala 56001, Iraq.
Sensors (Basel). 2021 Apr 16;21(8):2817. doi: 10.3390/s21082817.
Nonlinear spectrum distortions are caused by the peculiarities of the operation of charge-coupled device elements (CCD), in which the signal exposition time (Time of INTegration-TINT) is one of the significant parameters. A change of TINT on a CCD leads to a nonlinear distortion of the resulting spectrum. A nonlinear distortion of the spectrum, in turn, leads to errors in determining the central wavelength of fiber Bragg gratings (FBGs) and spectrally sensitive sensors, which, in general, negatively affects the accuracy of the measuring systems. This paper proposes an algorithm for correcting the 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.
非线性光谱畸变是由电荷耦合器件元件（CCD）的工作特性引起的，其中信号曝光时间（积分时间 - TINT）是重要参数之一。CCD上TINT的变化会导致所得光谱的非线性畸变。光谱的非线性畸变反过来又会导致在确定光纤布拉格光栅（FBG）和光谱敏感传感器的中心波长时出现误差，这通常会对测量系统的精度产生负面影响。本文提出了一种用于校正使用CCD作为接收器的光谱分析仪所获得光谱的非线性畸变的算法。结果表明，对光谱分析仪进行初步校准并随后对信号进行数学处理，可以对所得光谱进行校正，从而消除因在不同TINT下测量而引起的误差。
