中国激光, 2020, 47 (1): 0114001, 网络出版: 2020-01-09
小波去噪在太赫兹无损检测中的应用 
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Application of Wavelet Denoising in Terahertz Nondestructive Detection
图 & 表
图 1. 太赫兹时域光谱系统实物及原理图。(a)实物图; (b)原理图
Fig. 1. Photograph and schematic of terahertz time-domain spectroscopy system. (a) Photograph; (b) working principle
图 3. 酚醛塑料板样件实物图及两种层析成像方法缺陷检测图像的对比。(a)酚醛塑料板样件实物图;(b)缺陷尺寸设计图;(c)层析成像法的检测结果;(d)层析短时积分成像法的检测结果
Fig. 3. Photograph of phenolic plastic plate and comparison of defect detection images of two tomographic methods. (a) Photograph of phenolic plastic plate; (b) defect size design; (c) detection result of tomographic imaging method; (d) detection result of tomographic short-time integral imaging method
图 6. 酚醛塑料样件实物及缺陷尺寸设计图。(a)实物图;(b)缺陷尺寸设计图
Fig. 6. Photograph and defect size design of phenolic plastic samples. (a) Photograph; (b) defect size design
图 7. 功率谱成像伪彩图。(a)预处理前;(b) sym7, 3层,软阈值预处理;(c) sym7,5层,硬阈值预处理;(d) sym7,5层,软阈值预处理
Fig. 7. Pseudo-color maps of power spectral imaging. (a) Before preprocessing; (b) sym7, three layers, soft-threshold preprocessing; (c) sym7, five layers, hard-threshold preprocessing; (d) sym7, five layers, soft-threshold preprocessing
图 8. 预处理前后各采样点的无损检测信号。(a)预处理前;(b) sym7, 3层,软阈值预处理;(c) sym7, 5层,硬阈值预处理;(d) sym7, 5层,软阈值预处理
Fig. 8. Nondestructive detection signals of samples before and after preprocessing. (a) Before preprocessing; (b) sym7, three layers, soft-threshold preprocessing; (c) sym7, five layers, hard-threshold preprocessing (d) sym7, five layers, soft-threshold preprocessing
表 1酚醛塑料样件中不同预制缺陷的无损检测图像评价结果
Table1. Evaluation results of nondestructive detection images of different prefabricated defects in phenolic plastic samples
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张霁旸, 任姣姣, 陈思宏, 李丽娟, 赵常双. 小波去噪在太赫兹无损检测中的应用[J]. 中国激光, 2020, 47(1): 0114001. Jiyang Zhang, Jiaojiao Ren, Sihong Chen, Lijuan Li, Changshuang Zhao. Application of Wavelet Denoising in Terahertz Nondestructive Detection[J]. Chinese Journal of Lasers, 2020, 47(1): 0114001.
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