摘要
温度分布的高质量测量对工业生产具有重要意义。作为一种非侵入性的测量方法,声学层析成像(AT)被认为是一种有前景的温度分布可视化技术。为改善重建质量,提出了一种虚拟观测(VO)结合级联密集残差网络(CDRNN)的二阶段温度场高分辨率重建算法。首先通过VO算法获取粗网格温度场,然后搭建CDRNN预测细网格温度信息。采用VO算法获取AT反问题的总体最小二乘解,缓解了声波路径弯曲引起的重建误差。引入双输入补偿策略增加了CDRNN对原始测量信息的利用率,提高了网络稳定性,通过设置子网络简化网络结构,并采用密集连接与残差连接改善网络信息流,同时引入亚像素卷积层降低网络计算维度,提高重建精度。对典型温度场模型进行数值模拟,并与Landweber迭代法、ART算法、ART-NN算法和VO算法进行比较。结果表明VO-CDRNN算法的平均相对误差和均方根误差分别为0.44%和0.68%,重建结果均优于其他算法。
The high-quality measurement of temperature distribution is of great importance for industrial production.As a non-invasive measurement method,acoustic tomography(AT)is considered as a promising technique for the visualization of temperature distribution.To enhance the reconstruction quality,a two-stage high-resolution reconstruction algorithm was proposed for temperature field based on virtual observation(VO)and cascaded dense residual network(CDRNN).Firstly,the temperature field of coarse grid was obtained by the virtual observation algorithm,and then the CDRNN was built to predict the fine grid temperature distribution.The VO algorithm was used to achieve the overall least squares solution of the AT inverse problem,thereby reducing the reconstruction error caused by the bending of the acoustic path.Additionally,a dual-input compensation strategy was introduced to increase the utilization of the original measurement information by the CDRNN,and to improve the network stability.The network structure was streamlined by setting up sub-networks,dense connections and residual connections were also employed to improve network information flow.Sub-pixel convolutional layers were introduced to decrease network computing dimensions and boost reconstruction accuracy.Finally,the effectiveness of the algorithm was verified using a variety of simulated temperature field models.Through the numerical simulation of a typical temperature field model and comparison with the Landweber iterative method,ART algorithm,ART-NN algorithm,and VO algorithm,it was found that the average relative error and root mean square error of the VO-CDRNN algorithm were 0.44%and 0.68%,respectively,thus achieving better reconstruction results than other algorithms.
作者
张立峰
李晶
ZHANG Li-feng;LI Jing(Department of Automation,North China Electric Power University,Baoding Hebei 071003,China)
出处
《图学学报》
CSCD
北大核心
2023年第2期216-224,共9页
Journal of Graphics
基金
国家自然科学基金项目(61973115)。
关键词
声学层析成像
高分辨率重建
虚拟观测
残差连接
密集连接
亚像素卷积层
acoustic tomography
high-resolution reconstruction
virtual observation
residual connection
dense connection
sub-pixel convolutional layer
