零级像无缝光谱仪波长定标方法研究  被引量:1

Research on wavelength calibration method of slitless spectrometer based on zero-order image

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作  者:巴国鑫 季杭馨[1,2] 章华涛[1,2] 李顺[1,2] 侯永辉[1,2] 丁飞[4] 赵峥[4] BA Guoxin;JI Hangxin;ZHANG Huatao;LI Shun;HOU Yonghui;DING Fei;ZHAO Zheng(National Astronomical Observatories/Nanjing Institute of Astronomical Optics&Technology,Chinese Academy of Sciences,Nanjing 210042,China;CAS Key Laboratory of Astronomical Optics&Technology,Nanjing Institute of Astronomical Optics&Technology,Nanjing 210042,China;University of Chinese Academy of Sciences,Beijing 100049,China;National Engineering Research Center for Communication and Network Technology,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)

机构地区:[1]中国科学院国家天文台南京天文光学技术研究所,江苏南京210042 [2]中国科学院天文光学技术重点实验室(南京天文光学技术研究所),江苏南京210042 [3]中国科学院大学,北京100049 [4]南京邮电大学通信与网络技术国家工程研究中心,江苏南京210003

出  处:《中国测试》2023年第12期60-66,共7页China Measurement & Test

基  金:国家自然科学基金项目(12173061,11973068)。

摘  要:无缝光谱仪结构简单且可靠性高,在空间天文低分辨率光谱观测中普遍应用,但它通常无光谱定标设备并面临光谱定标难的问题。依据空间无缝光谱仪零级像和光谱像同时存在的特点,可采用基于零级像的无缝光谱实现定标。首先根据无缝光谱仪工作原理分析影响定标结果的各参数之间的关系;其次通过改进高斯拟合算法,拟合出更精确的光斑中心坐标;然后搭建无缝光谱仪仿真光路,将神经网络用于定标过程中的波长预测,并训练相关数据;最后测试并验证神经网络在波长预测中的准确性。经模拟该方法的波长预测结果误差小于1nm,定标精度好于其他传统方法,从而证明基于零级像的波长定标方法的可行性。The slitless spectrometer has a simple structure and high reliability,and is widely used in space astronomical low-resolution spectral observations,but it usually has no spectral calibration equipment and faces the problem of difficult spectral calibration.According to the characteristics of the zero-order image and spectral image of the space slitless spectrometer,the slitless spectrum based on the zero-order image can be used to achieve calibration.First,according to the working principle of the slitless spectrometer,the relationship between the parameters that affect the calibration results is analyzed;then,by improving the Gaussian fitting algorithm,a more accurate center coordinate of the spot is fitted;In the wavelength prediction during the calibration process,and train the relevant data;finally test and verify the accuracy of the neural network in the wavelength prediction.The error of the wavelength prediction result of this method is less than 1nm after simulation,and the calibration accuracy is better than other traditional methods,thus proving the feasibility of the wavelength calibration method based on the zero-order image.

关 键 词:空间天文 无缝光谱定标 高斯拟合 神经网络 

分 类 号:P111[天文地球—天文学] TB9[一般工业技术—计量学]

 

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