共查询到20条相似文献,搜索用时 0 毫秒
1.
Vesala G. T. Ghali V. S. Subhani Sk. Suresh B. 《Russian Journal of Nondestructive Testing》2021,57(11):1027-1038
Russian Journal of Nondestructive Testing - Active infrared thermography (AT) has been evolved as a prominent nondestructive testing technique for in-situ monitoring of defect-free composite... 相似文献
2.
Vesala G. T. Ghali V. S. Lakshmi A. Vijaya Naik R. B. 《Russian Journal of Nondestructive Testing》2021,57(6):476-485
Russian Journal of Nondestructive Testing - Recent advancements of nondestructive testing and evaluation (NDT&E) with machine learning, artificial intelligence, and the internet of things... 相似文献
3.
Russian Journal of Nondestructive Testing - Active infrared thermography (AIRT) has emerged as an extensively applied non-destructive testing and imaging (NDT&I) methodology for examining... 相似文献
4.
超声红外热成像以超声作为激励源,能够用于检测多种工件,但是由于热传导效应及空气的散射,检测结果中缺陷边缘较为模糊,成像对比度不高,并且会有温度分布不均引起的"散斑噪声"。为解决以上问题,提出了一种对超声红外热成像结果进行缺陷检测和定位的方法,使用限制对比度自适应直方图均衡(contrast limited adaptive histogram equalization,简称CLAHE)方法对图像进行对比度增强,用巴特沃斯滤波器进行降噪,根据图像的局部方差特征判断是否有缺陷,并通过形态学处理对缺陷中心进行定位。实验表明,根据局部方差可以对图像进行有效判断,经过形态学处理之后能够准确定位。该研究为通过超声红外热成像实现缺陷检测及定位提供了一种便捷有效的方法。 相似文献
5.
以含有缺陷的混凝土结构试件为研究对象,运用传热学理论,对热流在试件内部的传递过程进行了仿真分析,获得了试件表面的温度信号.结果表明,缺陷处与完好材料处对应试件表面温度存在着明显差异,红外热成像无损检测技术可用于实现对混凝土内部缺陷的检测. 相似文献
6.
Vesala G. T. Srinivasarao G. Ghali V. S. Sastry D. V. A. Rama Naik R. B. 《Russian Journal of Nondestructive Testing》2022,58(6):521-535
Russian Journal of Nondestructive Testing - Frequency coded non-stationary thermal wave imaging (NSTWI) has been evolved as viable active infrared non-destructive testing technique for inspecting... 相似文献
7.
Russian Journal of Nondestructive Testing - An ultrasonic phased array scanning method was used for lamb wave evaluation of surface and in-depth defects in a steel plate. The ultrasonic guided wave... 相似文献
8.
在毫米波段利用CST微波工作室仿真软件对热障涂层脱黏和热生长氧化层(Thermal growth oxide,TGO)的无损检测进行理论仿真研究,目的是确定不同工作频率段检测时的检测灵敏度和分辨率,以指导试验检测中波导探头的选择。在40~50 GHz和50~60 GHz两个频率段对热障涂层中陶瓷顶层和黏结层间的脱黏检测进行研究,主要包括由裂缝演变为脱黏时脱黏宽度的检测,脱黏面积及形状的检测和脱黏层厚度的检测。在18~26.5 GHz,26.5~40 GHz,40~50 GHz和50~60 GHz4个频率段对热障涂层中TGO层的厚度进行检测。结果显示,在毫米波段可以利用反射系数的相位差来良好的表征长脱黏的宽度,面脱黏时的脱黏面积,大脱黏时的脱黏深度以及TGO层的厚度;采用的工作频率越高时检测的灵敏度越高,并且对检测参数的检测分辨率越高。 相似文献
9.
Dass Sanchita Siddiqui Juned A. Mulaveesala Ravibabu 《Russian Journal of Nondestructive Testing》2022,58(6):510-520
Russian Journal of Nondestructive Testing - Active thermography is one of the promising painless techniques for bone density detection. It can defeat constraints of conventional diagnostic... 相似文献
10.
Venkata Subbarao Ghali Ravibabu Mulaveesala 《Sensing and Imaging: An International Journal》2011,12(1-2):15-33
Thermal non destructive testing is a whole-field, non-contact and non-destructive inspection method used to reveal the surface or subsurface anomalies in a test sample. This paper describes a novel modelling and simulation technique of a three dimensional pulse compression method for non-stationary thermal imaging. This method requires much lower peak power heat sources than the widely used conventional pulsed thermographic methods (PT and PPT) and requires less time than sinusoidal modulated Lock-in Thermography (LT). In addition, simulation results obtained with the proposed techniques are compared with the conventional phase-based thermal imaging techniques (PPT and LT). 相似文献
11.
采用Lamb波时间反转法,对复合材料结构进行在线连续健康监测。利用板中Lamb波时间反转法的原理和自聚焦特点,运用时间反转方法,通过传感器网络的布置,激励并接收Lamb波,从而对复合材料结构实现损伤监测。该方法无需结构无损情况的基准信号,能够对有损结构进行快速的损伤定位及损伤大小判断。采用改进的RAPID算法进行损伤成像,得到的损伤图像可将损伤情况可视化。实验研究表明所提方法可行和有效。 相似文献
12.
简要介绍了红外热成像检测技术的基本原理和分类,应用该技术分别对飞机复合材料层压板平底孔和蜂窝结构中分层和积水进行检测,并进行了一定分析. 相似文献
13.
14.
D.-M. Tsai C.-P. Lin 《The International Journal of Advanced Manufacturing Technology》2002,20(9):664-675
In this paper, we present a fast machine vision method for the automatic inspection of defects in textured surfaces. Traditional
2D Gabor filtering schemes have been shown to be very effective for detecting local anomalies in textured surfaces of industrial
materials. However, they are computationally expensive and sensitive to image rotation. In order to alleviate the limitations
of 2D Gabor filtering, we first use a 1D ring-projection transformation to compress a 2D grey-level image into a 1D pattern,
and then employ a 1D Gabor filter to detect defects embedded in a homogeneous texture. Given a problem with image size N × N and filter window W × W, the computational complexity can be reduced significantly from O(W
2
N
2
) in the 2D Gabor space to O(WN
2
) in the 1D Gabor space, and the detection results are invariant to rotation changes of a texture. The experiments on structural
textures such as a wooden surface, an LCD display, and a machined surface, and statistical textures such as granite, leather,
and sandpaper have shown the efficiency and effectiveness of the proposed method.
ID="A1" Correspondence and offprint requests to: Dr Du-Ming Tsai, Department of Industrial Engineering and Management, Yuan-Ze University, 135 Yuan-Tung Road, Nei-Li, Tao-Yuan,
Taiwan. E-mail: iedmtsai@saturn.yzu.edu.tw 相似文献
15.
Bu Chiwu Sun Zhihui Tang Qingju Liu Yuanlin Mei Chen 《Russian Journal of Nondestructive Testing》2019,55(1):80-87
Russian Journal of Nondestructive Testing - General infrared image processing and analysis methods mainly include non uniformity correction, enhancement, noise reduction, segmentation, etc. The... 相似文献
16.
17.
为提高超声导波技术对管中小缺陷的检测能力,提出一种采用窄带高压脉冲激发安装在管道外表面的压电晶片阵列实现管中导波时间反转检测的新方法。该方法采用窄带脉冲同时激励沿管道表面轴对称安装的压电晶片阵列,从各压电晶片接收到的反射回波中提取含L(n, 2)模态的缺陷信息进行时间反转,并用获得的时反波再次激励阵列中对应压电晶片,整个阵列将同时接收到较单一L(n, 2)模态信号。试验结果表明,该方法能较好地抑制导波的频散、多模态特性,提高缺陷回波信噪比,增加对小缺陷的检测能力。同时,时反前、后所检测到的管道端面和缺陷反射回波的导波模态几乎相同,可采用特定频率的L(0, 2)模态群速度作为时反后缺陷波包的传播速度;且时反后的幅值最大的缺陷波包能重构窄带初始激励信号幅值最大的波包,可有效增加缺陷波包的辨识能力。 相似文献
18.
基于群速度校准的超声导波技术及在复合材料缺陷检测中的应用 总被引:2,自引:0,他引:2
由于在复合材料板中传播的超声导波具有偏斜效应,使得理论群速度与试验测得的群速度不一致,因此需要对群速度幅值和传播方向进行校准。数值计算复合材料板中超声导波频散方程得到S0模态各个方向的理论相速度频散曲线。运用群速度校准法则对S0模态群速度幅度和传播方向进行修正。校准后的理论群速度与试验测得的群速度较为吻合。试验中采用频率200 kHz的S0模态对碳纤维复合材料板中的模拟缺陷进行检测。结果显示采用校准后群速度和试验测得的群速度可准确定位缺陷,且具有很好的一致性。因此,采用群速度校准法则可有效提高各向异性复合材料结构中超声导波的缺陷定位和识别能力。 相似文献
19.
Vavilov V. P. Demin V. G. Shiryaev V. V. Nesteruk D. A. 《Russian Journal of Nondestructive Testing》2003,39(9):657-664
The regions of application of thermal imaging technique for testing the heat shielding of building structures, diagnostics of smoke pipes, boilers, cooling ponds, and thermal service lines are described. 相似文献
20.
Subhani Sk. Tanguturi Rama Chaithanya Ghali V. S. 《Russian Journal of Nondestructive Testing》2021,57(7):627-634
Russian Journal of Nondestructive Testing - The phase-based post processing approaches gives better defect detection in non stationary thermal wave imaging for subsurface analysis of materials in... 相似文献