中国激光, 2017, 44 (11): 1106011, 网络出版: 2017-11-17
基于互相关卷积与高阶矩质心计算的布里渊散射谱特征提取 
下载： 775次
Feature Extraction of Brillouin Scattering Spectrum Based on Cross-Correlation Convolution and High-Order Centroid Calculation
图 & 表
图 2. 互相关卷积过程。(a)布里渊增益谱;(b)理想Lorentz曲线;(c)互相关卷积结果
Fig. 2. Process of cross-correlation convolution. (a) Brillouin gain spectrum; (b) ideal Lorentz curve; (c) cross-correlation convolution result
图 4. 欠拟合情况下2种方式提取的BFS对比
Fig. 4. Comparison of BFS extracted by two ways in case of under-fitting
图 5. 不同数量数据点对应的BFS提取结果。(a) 30;(b) 20;(c) 10;(d) 4
Fig. 5. BFS extraction results corresponding to different point numbers. (a) 30 points; (b) 20 points; (c) 10 points; (d) 4 points
图 6. BFS的高阶提取。(a) γ=60; (b) γ=1000; (c) eMSE;(d)所提算法与LCF提取结果的对比
Fig. 6. High-order extraction of BFS. (a) γ=60;(b) γ=1000;(c) eMSE; (d) comparison of extracted BFS of LCF and the proposed algorithm
图 7. 扫频间隔为(a) 10 MHz和(b) 20 MHz时2种方式的BFS提取结果比较
Fig. 7. Comparison of BFS extraction results in two ways at scanning frequency intervals of (a) 10 MHz and (b) 20 MHz
图 8. 布里渊散射谱服从Lorentz线型不理想时的处理方式。(a)布里渊增益谱;(b)互相关卷积结果;(c) LCF结果;(d)峰值对称截取后的布里渊增益谱
Fig. 8. Processing methods adopted with nonideal Brillouin gain spectrum. (a) Brillouin gain spectrum; (b) cross-correlation convolution result; (c) LCF result; (d) Brillouin gain spectrum after symmetric cutting
图 9. 散射谱截取后的互相关卷积结果与高阶BFS提取。(a)互相关卷积结果;(b)某位置的LCF;(c) 2种方式的提取结果对比;(d) 60 ℃和30 ℃下的BFS计算结果对比
Fig. 9. Cross-correlation convolution results and high-order BFS extraction.(a) Cross-correlation convolution result; (b) LCF result; (c) comparison of extraction results of LCF and the proposed method; (d) comparison of calculated BFS at 60 ℃ and 30 ℃
尚秋峰, 胡雨婷, 刘薇. 基于互相关卷积与高阶矩质心计算的布里渊散射谱特征提取[J]. 中国激光, 2017, 44(11): 1106011. Shang Qiufeng, Hu Yuting, Liu Wei. Feature Extraction of Brillouin Scattering Spectrum Based on Cross-Correlation Convolution and High-Order Centroid Calculation[J]. Chinese Journal of Lasers, 2017, 44(11): 1106011.
PDF全文
