There are many reasons for undetected defect such as unsuitable parameter selection of probe, the influence of interference wave and the unclear judgment of defect echo and burr echo.
电阻焊钢管焊缝超声波检测中缺陷漏检是导致钢管爆裂和焊缝失效的重要原因,造成缺陷漏检的原因有探头参数选择不合适、干扰波影响、缺陷回波和毛刺回波未分清等多种因素。
The paper discusses the defect echo feature when applying different K value s probe detects different depth artificial reflectors in ultrasonic detection,and makes comparison among them,thus puts forward the significance of applying different K value probe on different detected parts,meanwhile it provides theoretical basis for practical detection work.
文章讨论了超声波检测中应用不同K值的探头,检测不同深度的人工反射体时所产生的缺陷回波的特点,并对它们进行了比较,由此提出了对被检测工件应用不同K值探头的意义,同时也为实际检测工作提供了理论根据。
Reduction of noise in flaw signals based on independent component analysis;
基于独立分量分析的缺陷信号除噪
In order to detect pipeline by technology of magnetic flux leakage testing it is necessary to analysis flaw signal.
为了应用漏磁检测技术检测管道缺陷,需要对缺陷信号进行分析。
A method combined with global and dynamic threshold image segmentation is proposed,and by which weak defect regions in the ultrasonic C-scan image of Cu-steel surfacing are segmented effectively.
采用全局阈值与动态阈值相结合的图像阈值化分割方法,较好地解决了铜钢堆焊接头超声检测图像中弱信号缺陷分割困难问题。
Application of wavelet analysis in echo signal processing of the laser rapid scanning;
基于小波分析的激光扫描回波信号处理
The result shows that in order to obtain the strong echo signal,a suitable selection of the ultrasonic transducer operating frequency is necessary.
由此表明,选择合适的声发射换能器,有助于提高液位检测回波信号的强度。
Then the waveform design principle and the echo signal process in practice application are given.
论文从原理上讨论了频率步进雷达在强杂波背景中对运动目标的一种检测方案,给出了这个方案在实际应用中的波形设计原则以及回波信号的处理步骤,并用计算机仿真验证了该方案的可行性。
Application of Wavelet Packet Transform in Processing Ultrasonic Testing Echo Signals;
小波包分解在超声检测缺陷回波信号处理中的应用
The Identifaction of Defects wave and Non-defects wave in Forging’s Ultrasonic Testing
锻件超声波探伤中缺陷波和伪缺陷波的识别
The ultrasonic echo signal analysis of welding flaw and the selection of optimum feature subset
焊接缺陷的超声回波信号分析与最佳特征子集的选择
She sent Back the defected product.
她退回有缺陷的产品。
It is often misjudged the flaw echo in ultrasonic examination that the echo signals produced by sound field property and geometrical shape of the component examined according to sound field theory.
超声探伤中,由于声场特性、件几何形状的影响,所产生的各种回波信号常常被误判为缺陷信号。
Waviness- Widely spaced imperfections on the surface of a wafer.
波纹-晶圆片表面经常出现的缺陷。
The Application of Wavelet Analysis for the Welding Line Flaw Detection
小波分析在焊缝缺陷识别中的应用
In the process of ultrasonic inspection, one of the difficulty is defect qualitative problem.
超声波检测中,缺陷定性是检测的难点。
Keywords: concrete, crack, defect, elastic waves, imaging.
关键词：混凝土、裂缝、缺陷、弹性波、影像法。
Study on Defect Detection Algorithm of Industrial CT Image Based on Ridgelet;
工业CT图像缺陷检测的脊波算法研究
The Effects of Defect on the Dynamics of Rotating Spiral Wave;
缺陷对周期螺旋波动力学行为的影响
The Study on Infrared Thermal Wave Detection Thchnology for Inner Defects in Casting Product
铸件内部缺陷红外热波检测技术研究
A Novel DGS Microstrip Low-Pass Filter
一种新颖的缺陷地微带线低通滤波器
Textile Defect Classification Based on Discriminative Wavelet Frames
采用小波框架的纺织品缺陷分类方法
Defect structures of Rayleigh-Benard travelling wave convection in binary fluid mixtures
混合流体Rayleigh-Benard行波对流中的缺陷结构
Ultrasonic Detection of Partial Discharge on Typical Defects in GIS
GIS中典型缺陷局部放电的超声波检测
Study on Pile Integrity Testing and Its Defective Verification by Reflect Wave Method
反射波法(P.I.T.)基桩检测与缺陷验证研究
Flaw Testing of Welding Butt by Ultrasonic Guided Waves
超声导波检测对接焊缝缺陷试验研究