中国激光, 2020, 47 (9): 0904008, 网络出版: 2020-09-16
基于小波变换的平板波前死条纹噪声滤除方法 
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Filtering Method of Fixed Pattern Noise in Window Wavefront Based on Wavelet Transform
图 & 表
图 1. PSI测量平板透射波前示意图。(a)空腔;(b)平板信息
Fig. 1. Schematic diagram of PSI measurement of window transmission wavefront. (a) Cavity; (b) window information
图 4. 理想平板的含噪透射波前。(a)透射波前;(b)多次反射后的透射波前;(c)图4 (b)的空间频谱;(d)图4 (c)中心区域的放大图
Fig. 4. Noised transmitted wavefront of an ideal flat window. (a) Transmitted wavefront; (b) transmitted wavefront after multiple reflections; (c) spatial frequency spectrum of Fig.4 (b); (d) enlarged view of the central area of Fig.4 (c)
图 5. 非理想平板的含噪透射波前。(a)透射波前;(b)多次反射后的透射波前;(c)图5 (b)的空间频谱;(d)图5 (c)中心区域的放大图
Fig. 5. Noised transmitted wavefront of a non-ideal window. (a) Transmitted wavefront; (b) transmitted wavefront after multiple reflections; (c) spatial frequency spectrum of Fig. 5 (b); (d) enlarged view of the central area of Fig.5 (c)
图 6. 降噪前后的波前分布。(a)理想波前;(b) 受死条纹影响的图6 (a);(c)降噪后的图6 (b);(d)实际波前;(e)受死条纹影响的图6 (d);(f)降噪后的图6 (e)
Fig. 6. Wavefront distribution before and after noise reduction. (a) Ideal wavefront; (b) Fig.6 (a) affected by fixed patterns; (c) Fig.6 (b) after noise reduction; (d) actual wavefront; (e) Fig.6 (d) affected by fixed patterns; (f) Fig.6 (e) after noise reduction
图 7. φw、φs与φj的第300行对比。(a)理想平板;(b)实际平板
Fig. 7. Comparison of the 300th row of φw, φs and φj. (a) Ideal window; (b) actual window
图 8. 不同方法获得的平板透射波前。(a)由LCPSI测得的波前;(b)图8 (a)的中频成分;(c)由PSI测得的波前;(d)图8 (c)的中频成分;(e)降噪后的图8 (c);(f)图8 (e)的中频成分
Fig. 8. Window transmitted wavefront obtained by different methods. (a) Wavefront measured by LCPSI; (b) middle frequency components of Fig.8 (a); (c) wavefront measured by PSI; (d) middle frequency components of Fig.8 (c); (e) Fig.8 (c) after noise reduction; (f) middle frequency components of Fig.8 (e)
表 1不同波前的PV与RMS
Table1. PV and RMS of different wavefronts unit:nm
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表 2图8 中波前的PV与RMS
Table2. PV and RMS of the wavefront in Fig.8 unit:nm
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徐凯源, 李大海, 刘昂, 柴立群, 何宇航, 陈宁. 基于小波变换的平板波前死条纹噪声滤除方法[J]. 中国激光, 2020, 47(9): 0904008. Xu Kaiyuan, Li Dahai, Liu Ang, Chai Liqun, He Yuhang, Chen Ning. Filtering Method of Fixed Pattern Noise in Window Wavefront Based on Wavelet Transform[J]. Chinese Journal of Lasers, 2020, 47(9): 0904008.
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