Nonlinearity Correction of Fourier Transform Spectrometer in Solar Observation Using Simulated Annealing  

作　　者：Ze-Yin Dong Xian-Yong Bai Song Feng Yuan-Yong Deng Zi-Hang Yu Wen-Tong Ao Xiao Yang Zhi-Yong Zhang Zhi-Wei Feng 

机构地区：[1]Faculty of Information Engineering and Automation,Kunming University of Science and Technology,Kunming 650500,China [2]Key Laboratory of Solar Activity,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [3]School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 101408,China

出　　处：《Research in Astronomy and Astrophysics》2023年第5期172-179,共8页天文和天体物理学研究（英文版）

基　　金：supported by the Joint Funds of the National Natural Science Foundation of China(U1931107);supported by the National Key Research and Development Program of China No.2021YFA1600500。

摘　　要：A Fourier transform spectrometer(FTS)has been used to observe solar activities due to its ultra-high spectral resolution.However,the FTS in-band spectra are usually distorted and some artifacts appear in out-of-band regions due to nonlinear effects.Therefore,the FTS nonlinear problem must be corrected.In this study,we proposed a novel method to correct the nonlinear effects using simulated annealing.We simulated several nonlinear spectra to evaluate the performance of our method.The calculated quadratic coefficients are extremely close to the given values,demonstrating that the method is effective and accurate.The proposed method is further used to correct the blackbody and solar spectra with nonlinearity obtained by Bruker IFS-125HR installed at the Huairou Solar Observing Station,which is a pathfinder for the accurate infrared magnetic field measurements of the Sun project.To the blackbody spectra,the nonlinearity in low-and high-frequency regions are corrected by 89.09%and 60.84%.The nonlinear correction of the solar spectra in the low-and high-frequency regions have reached 65.34%and 81.04%,respectively.These results prove that our method can correct the nonlinear problem to improve the data accuracy.

关 键 词：SUN infrared-instrumentation interferometers-techniques INTERFEROMETRIC 

分 类 号：P182.2[天文地球—天文学]