CN108414615A - A kind of nonmetallic erosion resistant coating lamination defect supersonic detection method and device - Google Patents
A kind of nonmetallic erosion resistant coating lamination defect supersonic detection method and device Download PDFInfo
- Publication number
- CN108414615A CN108414615A CN201810011287.6A CN201810011287A CN108414615A CN 108414615 A CN108414615 A CN 108414615A CN 201810011287 A CN201810011287 A CN 201810011287A CN 108414615 A CN108414615 A CN 108414615A
- Authority
- CN
- China
- Prior art keywords
- signal
- wavelet
- metallic anti
- ultrasonic
- probe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000007547 defect Effects 0.000 title claims abstract description 61
- 238000001514 detection method Methods 0.000 title claims abstract description 57
- 238000000576 coating method Methods 0.000 title claims abstract description 28
- 239000011248 coating agent Substances 0.000 title claims abstract description 15
- 230000003628 erosive effect Effects 0.000 title abstract 7
- 238000003475 lamination Methods 0.000 title abstract 6
- 239000000523 sample Substances 0.000 claims abstract description 75
- 238000000034 method Methods 0.000 claims abstract description 18
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 3
- 238000005260 corrosion Methods 0.000 claims description 56
- 230000032798 delamination Effects 0.000 claims description 32
- 238000012545 processing Methods 0.000 claims description 16
- 230000009466 transformation Effects 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 31
- 238000012360 testing method Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000005291 magnetic effect Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000012720 thermal barrier coating Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0238—Wood
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
Description
技术领域technical field
本发明涉及测试测量技术及结构健康监测领域，特别涉及一种非金属防腐层分层缺陷超声导波检测方法及装置。The invention relates to the fields of testing and measurement technology and structural health monitoring, in particular to an ultrasonic guided wave detection method and device for layered defects of non-metallic anticorrosion layers.
背景技术Background technique
工业用金属材料表面通常覆盖有非金属防腐层，如各种金属板材以及石化行业中用到的内衬防腐管道等，随着使用时间增加，防腐层容易产生各种缺陷，其中界面分层是常见的一种缺陷，分层缺陷会大大影响材料正常工作，严重的会导致安全事故发生。The surface of industrial metal materials is usually covered with a non-metallic anti-corrosion layer, such as various metal plates and anti-corrosion-lined pipelines used in the petrochemical industry. With the increase of use time, various defects are prone to occur in the anti-corrosion layer, and the interface layer is A common defect, delamination defects will greatly affect the normal work of the material, and seriously cause safety accidents.
目前对防腐层界面损伤检测可分为非超声波防腐层界面损伤监测方法和超声波防腐层界面损伤监测方法两大类，其中非超声波防腐层界面损伤监测方法主要包括红外热波检测方法、漏磁检测方法、涡流检测法等。然而，红外热波检测若要达到一定分辨率，对仪器设备要求较高；漏磁检测需要在铁磁材料上进行，不适用于非金属材料的分层检测；涡流检测对金属表面或近表面的缺陷有很高的检出灵敏度，但是对于非金属的热障涂层损伤却无法进行检测。At present, the interface damage detection of anti-corrosion layer can be divided into two categories: non-ultrasonic anti-corrosion layer interface damage monitoring method and ultrasonic anti-corrosion layer interface damage monitoring method. The non-ultrasonic anti-corrosion layer interface damage monitoring method mainly includes infrared thermal wave detection method and magnetic flux leakage detection method. method, eddy current testing, etc. However, if infrared thermal wave detection is to achieve a certain resolution, it requires high equipment; magnetic flux leakage detection needs to be carried out on ferromagnetic materials, which is not suitable for layered detection of non-metallic materials; The defect has a high detection sensitivity, but it cannot detect the non-metallic thermal barrier coating damage.
超声波检测法是广泛用于材料探伤的常用方法，也是最早用于复合材料无损评价的方法之一。它主要利用复合材料本身或其缺陷的声学性质对超声波传播的影响来检测材料内部和表面的缺陷，如气泡、分层、裂纹、脱粘、贫胶等。超声波应用于防腐层界面损伤检测主要有声发射法、超声脉冲回波法、超声导波法等。现有的超声检测方法大多为检测复合材料的粘接质量，而较少涉及对金属和非金属分层缺陷的研究。Ultrasonic testing is a common method widely used in material flaw detection, and it is also one of the earliest methods used in non-destructive evaluation of composite materials. It mainly uses the influence of the acoustic properties of the composite material itself or its defects on ultrasonic propagation to detect defects inside and on the surface of the material, such as bubbles, delamination, cracks, debonding, poor glue, etc. Ultrasound is used in the detection of interface damage of anti-corrosion coatings, mainly including acoustic emission method, ultrasonic pulse echo method, ultrasonic guided wave method, etc. Most of the existing ultrasonic testing methods are used to test the bonding quality of composite materials, but seldom involve the study of metal and non-metal delamination defects.
在结构损伤检测领域，利用传统超声进行损伤检测是基于超声波的线性响应结果，其本质是介质间具有不同的声阻抗。传统线性超声检测对操作和环境，几何形状和边界条件的变化敏感。而且基于线性响应的超声检测通常对微小裂纹、疲劳、蠕变、弱粘接等问题不敏感，不能用于材料或粘接构件的早期性能退化检测预警。In the field of structural damage detection, the use of traditional ultrasound for damage detection is based on the linear response of ultrasonic waves, and its essence is that the media have different acoustic impedances. Traditional linear ultrasonic inspection is sensitive to changes in operation and environment, geometry and boundary conditions. Moreover, ultrasonic testing based on linear response is usually not sensitive to problems such as micro-cracks, fatigue, creep, weak bonding, etc., and cannot be used for early detection and early warning of performance degradation of materials or bonded components.
发明内容Contents of the invention
基于此，本发明的目的在于，克服现有技术中的缺点和不足，提供一种非金属防腐层分层缺陷超声导波检测方法。Based on this, the purpose of the present invention is to overcome the shortcomings and deficiencies in the prior art, and provide an ultrasonic guided wave detection method for delamination defects of non-metallic anti-corrosion coatings.
本发明的目的是通过以下技术方案实现的：一种非金属防腐层分层缺陷超声导波检测方法，包括以下步骤：The purpose of the present invention is achieved through the following technical solutions: a method for detecting layered defects of non-metallic anti-corrosion coatings by ultrasonic guided waves, comprising the following steps:
S1：向非金属防腐层的待测区域发射超声波正弦信号；S1: Transmit ultrasonic sinusoidal signals to the area to be tested of the non-metallic anti-corrosion layer;
S2：采集由所述超声波正弦信号通过非金属防腐层的待测区域后形成的接收信号；S2: collecting a received signal formed by the ultrasonic sinusoidal signal passing through the area to be tested of the non-metallic anti-corrosion layer;
S3：获取所述接收信号的非线性谐波分量，对所述非线性谐波分量进行小波包变换，获得小波能量值，基于所述小波能量值对非金属防腐层分层缺陷进行评估。S3: Obtain the nonlinear harmonic component of the received signal, perform wavelet packet transformation on the nonlinear harmonic component to obtain a wavelet energy value, and evaluate delamination defects of the non-metallic anti-corrosion layer based on the wavelet energy value.
相对于现有技术，本发明采用超声波正弦信号作为检测信号，频散特性弱、能量散失低，能有效提高单次检测的检测范围；并且基于非线性响应的超声检测来反映非金属防腐层的微观变化，通过小波包变换对接收信号的非线性谐波分量进行处理，利用小波能量值作为非金属防腐层分层缺陷的衡量指标，可以较好地反映非金属防腐层的分层缺陷。Compared with the prior art, the present invention uses an ultrasonic sinusoidal signal as the detection signal, which has weak dispersion characteristics and low energy loss, which can effectively improve the detection range of a single detection; For microscopic changes, the nonlinear harmonic component of the received signal is processed by wavelet packet transform, and the wavelet energy value is used as a measure of delamination defects of non-metallic anti-corrosion coatings, which can better reflect the delamination defects of non-metallic anti-corrosion coatings.
进一步地，步骤S3中，所述小波能量值的获得方法为：通过n阶小波包对接收信号进行分解，得到个信号小波子集，每一个子集表示为：Xj＝[xj,1,xj,2,…,xj,m ]，(j＝1,2,…,2n)，其中，j表示信号的频率范围，m表示总的信号采集数目；定义第i个经过分解的能量信号为：则第i个能量向量为：第i个能量向量的小波能量值为： Further, in step S3, the method for obtaining the wavelet energy value is: decomposing the received signal through n-order wavelet packets to obtain signal wavelet subsets, each subset is expressed as: X j ＝[x j,1 ,x j,2 ,…,x j,m ] , (j=1,2,…,2 n ), where, j represents the frequency range of the signal, and m represents the total number of signal acquisitions; define the i-th decomposed energy signal as: Then the i-th energy vector is: The wavelet energy value of the i-th energy vector is:
进一步地，步骤S3中，基于所述小波能量值对非金属防腐层分层缺陷进行评估的方法为：小波能量值越小，非金属防腐层分层缺陷损伤越大。分层缺陷位置中超声导波的波导为单层介质，其余无缺陷部位的波导为双层介质，由波动理论可知，超声导波在双层介质中的传播损耗更大，因此对接收信号，小波能量值越小，表明信号能量损耗越大，进而说明分层缺陷损伤越大。Further, in step S3, the method for evaluating the delamination defect of the non-metallic anti-corrosion layer based on the wavelet energy value is: the smaller the wavelet energy value, the greater the damage of the delamination defect of the non-metallic anti-corrosion layer. The waveguide of the ultrasonic guided wave in the layered defect position is a single-layer medium, and the waveguide of the other non-defective parts is a double-layer medium. According to the wave theory, the propagation loss of the ultrasonic guided wave in the double-layer medium is greater, so for the received signal, The smaller the wavelet energy value, the greater the signal energy loss, which in turn indicates the greater damage of delamination defects.
本发明还提供了一种非金属防腐层分层缺陷超声导波检测装置，包括控制装置、信号发生装置、超声探头和信号采集装置；所述信号发生装置的输入端、信号采集装置的输出端分别与控制装置电连接；所述超声探头包括发射探头和接收探头，所述发射探头与信号发生装置的输出端电连接，所述接收探头与信号采集装置的输入端电连接；所述发射探头和接收探头相对设置，两者之间的连线穿过非金属防腐层的待测区域；所述控制装置包括信号控制模块和信号处理模块，所述信号控制模块控制信号发生装置产生正弦信号，所述信号处理模块获取信号采集装置采集的接收信号的非线性谐波分量，并对所述非线性谐波分量进行小波包变换，获得小波能量值。The present invention also provides a non-metallic anti-corrosion layer layered defect ultrasonic guided wave detection device, including a control device, a signal generating device, an ultrasonic probe and a signal collecting device; the input end of the signal generating device, the output end of the signal collecting device respectively electrically connected to the control device; the ultrasonic probe includes a transmitting probe and a receiving probe, the transmitting probe is electrically connected to the output end of the signal generating device, and the receiving probe is electrically connected to the input end of the signal collecting device; the transmitting probe Set opposite to the receiving probe, the connection between the two passes through the area to be measured of the non-metallic anti-corrosion layer; the control device includes a signal control module and a signal processing module, and the signal control module controls the signal generating device to generate a sinusoidal signal, The signal processing module acquires the nonlinear harmonic component of the received signal collected by the signal acquisition device, and performs wavelet packet transformation on the nonlinear harmonic component to obtain the wavelet energy value.
相对于现有技术，本发明搭建了由控制装置、超声探头、信号发生装置和信号采集装置组成的检测平台，控制装置控制信号发生装置产生正弦信号，信号由发射探头往待测区域发射，通过待测区域传播后到达接收探头，信号采集装置采集来自接收探头的接收信号并输送至控制装置，控制装置基于非线性响应对接收信号进行小波分析，从而可以实现对非金属防腐层分层缺陷的有效准确的检测。此外，本发明基于超声导波，利用发射探头和接收探头实现对两探头之间连线经过区域的分层缺陷检测，相比于常规的点对点检测，大大提高了检测效率。Compared with the prior art, the present invention builds a detection platform consisting of a control device, an ultrasonic probe, a signal generating device and a signal acquisition device. The control device controls the signal generating device to generate a sinusoidal signal, and the signal is transmitted by the transmitting probe to the area to be tested. After the area to be tested reaches the receiving probe after propagation, the signal acquisition device collects the received signal from the receiving probe and sends it to the control device. The control device performs wavelet analysis on the received signal based on the nonlinear response, so that the detection of layered defects of the non-metallic anti-corrosion layer can be realized. Effective and accurate detection. In addition, based on the ultrasonic guided wave, the present invention uses the transmitting probe and the receiving probe to detect layered defects in the area where the connection between the two probes passes, which greatly improves the detection efficiency compared with the conventional point-to-point detection.
进一步地，所述控制装置包括信号控制模块和信号处理模块，所述信号控制模块与信号发生装置的输入端电连接，所述信号处理模块与信号采集装置的输出端电连接；所述信号控制模块控制信号发生装置产生正弦信号，所述信号处理模块获取通过信号采集装置采集的接收信号的非线性谐波分量，并对所述非线性谐波分量进行小波包变换，获得小波能量值。Further, the control device includes a signal control module and a signal processing module, the signal control module is electrically connected to the input end of the signal generating device, and the signal processing module is electrically connected to the output end of the signal acquisition device; the signal control module The module controls the signal generating device to generate a sinusoidal signal, and the signal processing module obtains the nonlinear harmonic component of the received signal collected by the signal acquisition device, and performs wavelet packet transformation on the nonlinear harmonic component to obtain the wavelet energy value.
进一步地，所述信号处理模块包括高通滤波器、带通滤波器和计算单元；所述高通滤波器去除接收信号中的低频分量，所述带通滤波器获取接收信号中的非线性谐波分量，所述计算单元对所述非线性谐波分量进行小波包变换，获得小波能量值。Further, the signal processing module includes a high-pass filter, a band-pass filter and a calculation unit; the high-pass filter removes low-frequency components in the received signal, and the band-pass filter obtains the nonlinear harmonic components in the received signal , the calculation unit performs wavelet packet transformation on the nonlinear harmonic component to obtain a wavelet energy value.
进一步地，所述信号发生装置包括波形发生器和信号放大器；所述波形发生器的输入端与控制装置电连接，所述波形发生器的输出端与信号放大器的输入端电连接；所述信号放大器的输出端与发射探头电连接。Further, the signal generating device includes a waveform generator and a signal amplifier; the input terminal of the waveform generator is electrically connected to the control device, and the output terminal of the waveform generator is electrically connected to the input terminal of the signal amplifier; the signal The output end of the amplifier is electrically connected with the emission probe.
进一步地，所述正弦信号为经过汉宁窗调制的正弦信号，其中心频率与超声探头的谐振频率一致。Further, the sinusoidal signal is a sinusoidal signal modulated by a Hanning window, and its center frequency is consistent with the resonance frequency of the ultrasonic probe.
进一步地，所述控制装置为上位机。Further, the control device is a host computer.
进一步地，所述信号采集装置为数据采集卡。Further, the signal acquisition device is a data acquisition card.
为了更好地理解和实施，下面结合附图详细说明本发明。For better understanding and implementation, the present invention will be described in detail below in conjunction with the accompanying drawings.
附图说明Description of drawings
图1为实施例的非金属防腐层分层缺陷超声导波检测方法的流程示意图。Fig. 1 is a schematic flowchart of an ultrasonic guided wave detection method for delamination defects of non-metallic anti-corrosion coatings according to an embodiment.
图2为实施例的非金属防腐层分层缺陷超声导波检测装置的结构示意图。Fig. 2 is a schematic structural diagram of an ultrasonic guided wave detection device for delamination defects in non-metallic anti-corrosion layers according to an embodiment.
具体实施方式Detailed ways
本发明的非金属防腐层分层缺陷超声导波检测方法，包括以下步骤：The ultrasonic guided wave detection method of the delamination defect of the non-metallic anti-corrosion layer of the present invention comprises the following steps:
S1：向非金属防腐层的待测区域发射超声波正弦信号；S1: Transmit ultrasonic sinusoidal signals to the area to be tested of the non-metallic anti-corrosion layer;
S2：采集由所述超声波正弦信号通过非金属防腐层的待测区域后形成的接收信号；S2: collecting a received signal formed by the ultrasonic sinusoidal signal passing through the area to be tested of the non-metallic anti-corrosion layer;
S3：获取所述接收信号的非线性谐波分量，对所述非线性谐波分量进行小波包变换，获得小波能量值，基于所述小波能量值对非金属防腐层分层缺陷进行评估。S3: Obtain the nonlinear harmonic component of the received signal, perform wavelet packet transformation on the nonlinear harmonic component to obtain a wavelet energy value, and evaluate delamination defects of the non-metallic anti-corrosion layer based on the wavelet energy value.
具体的，请参阅图1，其为本实施例的非金属防腐层分层缺陷超声导波检测方法的流程示意图，包括以下步骤：Specifically, please refer to FIG. 1, which is a schematic flow chart of the ultrasonic guided wave detection method for non-metallic anti-corrosion coating delamination defects in this embodiment, including the following steps:
W1：确定待测区域，设置发射探头和接收探头，使其连线穿过待测区域。W1: Determine the area to be tested, set the transmitting probe and receiving probe so that the connection line passes through the area to be tested.
具体的，待测区域为待测对象非金属防腐层可能或者容易产生缺陷的部位，根据检测探头之间的距离选择合适的发射探头和接收探头，发射探头和接收探头采用常规的超声斜探头即可，2.5Z10×10A60的斜探头可以满足大部分板状或管状待测对象的需求，对特殊材质或形状的待测对象，可以通过测试选用其它参数的超声斜探头。Specifically, the area to be tested is the part where the non-metallic anti-corrosion layer of the object to be tested may or is likely to have defects. According to the distance between the detection probes, the appropriate transmitting probe and receiving probe are selected. The transmitting probe and receiving probe adopt conventional ultrasonic angled probes. Yes, the 2.5Z10×10A60 angle probe can meet the needs of most plate-shaped or tubular objects to be tested. For objects with special materials or shapes, ultrasonic angle probes with other parameters can be selected through testing.
W2：基于发射探头和接收探头搭建包含上位机、波形发生器、信号放大器和数据采集卡的检测平台，并将各部件用信号线相连接。W2: Based on the transmitting probe and receiving probe, build a detection platform including a host computer, a waveform generator, a signal amplifier and a data acquisition card, and connect each component with a signal line.
具体的，请参阅图2，其为本实施例的非金属防腐层分层缺陷超声导波检测装置的结构示意图，包括上位机1、波形发生器2、信号放大器3、发射探头4、接收探头5和数据采集卡6，其连接方式为：波形发生器2的输入端、数据采集卡6的输出端分别与上位机1电连接，波形发生器2的输出端与信号放大器3的输入端电连接，信号放大器3的输出端与发射探头4电连接，数据采集卡6的输入端与接收探头5电连接，发射探头4和接收探头5的连线穿过待测区域D。其中，信号放大器3的放大倍数由待测区域大小决定，若待测区域较大，则可选用放大倍数较大的信号放大器，或者将大的待测区域分成数个小区域进行多次检测。Specifically, please refer to Figure 2, which is a schematic structural diagram of the ultrasonic guided wave detection device for non-metallic anti-corrosion layer layered defects in this embodiment, including a host computer 1, a waveform generator 2, a signal amplifier 3, a transmitting probe 4, and a receiving probe 5 and data acquisition card 6, its connection mode is: the input end of waveform generator 2, the output end of data acquisition card 6 are electrically connected with upper computer 1 respectively, the output end of waveform generator 2 is electrically connected with the input end of signal amplifier 3 connection, the output end of the signal amplifier 3 is electrically connected to the transmitting probe 4, the input end of the data acquisition card 6 is electrically connected to the receiving probe 5, and the connection line between the transmitting probe 4 and the receiving probe 5 passes through the area D to be measured. Wherein, the magnification of the signal amplifier 3 is determined by the size of the area to be tested. If the area to be tested is large, a signal amplifier with a larger magnification can be selected, or the large area to be tested can be divided into several small areas for multiple detections.
W3：利用上位机和波形发生器产生经过汉宁窗调制的正弦信号，信号经过信号放大器放大后由发射探头往待测区域发射。W3: Use the host computer and waveform generator to generate a sinusoidal signal modulated by the Hanning window. The signal is amplified by the signal amplifier and then sent to the area to be tested by the transmitting probe.
具体的，采用经过汉宁窗调制的正弦信号对非金属防腐层分层缺陷进行单通道激励-单通道接收检测，经过汉宁窗调制的正弦信号的中心频率与超声探头的谐振频率一致，以保证信号在待测区域中的有效传播。Specifically, the sinusoidal signal modulated by the Hanning window is used to perform single-channel excitation-single-channel reception detection on the layered defect of the non-metallic anti-corrosion layer. The center frequency of the sinusoidal signal modulated by the Hanning window is consistent with the resonant frequency of the ultrasonic probe. Ensure the effective propagation of the signal in the area to be tested.
W4：信号通过待测区域传播后到达接收探头，通过数据采集卡采集接收信号并输送至上位机。具体的，数据采集卡可根据对结果的精确度要求进行选择。W4: After the signal propagates through the area to be tested, it reaches the receiving probe, and the received signal is collected by the data acquisition card and sent to the host computer. Specifically, the data acquisition card can be selected according to the accuracy requirements of the results.
W5：通过上位机获取接收信号中的非线性谐波分量，并对该非线性谐波分量进行小波包变换，获得小波能量值，基于小波能量值对非金属防腐层的分层缺陷进行评估。W5: Obtain the nonlinear harmonic component in the received signal through the host computer, and perform wavelet packet transformation on the nonlinear harmonic component to obtain the wavelet energy value, and evaluate the delamination defects of the non-metallic anti-corrosion coating based on the wavelet energy value.
具体的，对接收信号进行小波包变换，基于小波能量值对非金属防腐层的分层缺陷进行评估的方法为：通过n阶小波包对接收信号进行分解，得到个信号小波子集，每一个子集表示为：Xj＝[xj,1,xj,2,…,xj,m]，(j＝1,2,…,2n)，其中，j表示信号的频率范围，m表示总的信号采集数目；定义第i个经过分解的能量信号为： 则第i个能量向量为：第i个能量向量的小波能量值为：通过计算分层缺陷处的Ew值来评估非金属防腐层分层缺陷损伤，小波能量值Ew越小，表明信号能量损耗越大，进而说明分层缺陷损伤越大。Specifically, the wavelet packet transform is performed on the received signal, and the method of evaluating the delamination defect of the non-metallic anti-corrosion coating based on the wavelet energy value is as follows: decompose the received signal through the n-order wavelet packet, and obtain signal wavelet subsets, each subset is expressed as: X j =[x j,1 ,x j,2 ,…,x j,m ], (j=1,2,…,2 n ), where, j represents the frequency range of the signal, and m represents the total number of signal acquisitions; define the i-th decomposed energy signal as: Then the i-th energy vector is: The wavelet energy value of the i-th energy vector is: The delamination defect damage of the non-metallic anti-corrosion coating is evaluated by calculating the E w value at the delamination defect. The smaller the wavelet energy value E w is, the greater the signal energy loss is, and the greater the delamination defect damage is.
本发明的非金属防腐层分层缺陷超声导波检测装置，包括控制装置、信号发生装置、超声探头和信号采集装置，所述信号发生装置的输入端、信号采集装置的输出端分别与控制装置电连接；所述超声探头包括发射探头和接收探头，所述发射探头与信号发生装置的输出端电连接，所述接收探头与信号采集装置的输入端电连接；所述发射探头和接收探头相对设置，两者之间的连线穿过非金属防腐层的待测区域；所述控制装置控制信号发生装置产生正弦信号，并获取信号采集装置采集的接收信号的非线性谐波分量，并对所述非线性谐波分量进行小波包变换，获得小波能量值。The non-metallic anti-corrosion layer layered defect ultrasonic guided wave detection device of the present invention comprises a control device, a signal generating device, an ultrasonic probe and a signal acquisition device, the input end of the signal generation device and the output end of the signal acquisition device are respectively connected with the control device Electrically connected; the ultrasonic probe includes a transmitting probe and a receiving probe, the transmitting probe is electrically connected to the output end of the signal generating device, and the receiving probe is electrically connected to the input end of the signal acquisition device; the transmitting probe and the receiving probe are opposite Setting, the connection between the two passes through the area to be measured of the non-metallic anti-corrosion layer; the control device controls the signal generating device to generate a sinusoidal signal, and obtains the nonlinear harmonic component of the received signal collected by the signal acquisition device, and The nonlinear harmonic components are subjected to wavelet packet transformation to obtain wavelet energy values.
具体的，请参阅图2，其为本实施例的非金属防腐层分层缺陷超声导波检测装置的结构示意图。本实施例中，所述控制装置为上位机1，包括信号控制模块和信号处理模块，所述信号处理模块包括高通滤波器、带通滤波器和计算单元；所述信号发生装置包括波形发生器2和信号放大器3；所述信号采集装置为数据采集卡6；所述超声探头包括发射探头4和接收探头5，两者的连线穿过待测区域D，该待测区域D为位于金属本体a上的非金属防腐层b可能或者容易产生缺陷的部位。Specifically, please refer to FIG. 2 , which is a schematic structural diagram of an ultrasonic guided wave detection device for delamination defects of non-metallic anti-corrosion layers in this embodiment. In this embodiment, the control device is a host computer 1, including a signal control module and a signal processing module, and the signal processing module includes a high-pass filter, a band-pass filter and a computing unit; the signal generating device includes a waveform generator 2 and a signal amplifier 3; the signal acquisition device is a data acquisition card 6; the ultrasonic probe includes a transmitting probe 4 and a receiving probe 5, and the connection of the two passes through the area D to be measured, and the area D to be measured is located in a metal The non-metallic anti-corrosion layer b on the body a may or is likely to have defects.
本实施例的检测装置的连接方式为：波形发生器2的输入端与上位机1的信号控制模块电连接，波形发生器2的输出端与信号放大器3的输入端电连接，信号放大器3的输出端与发射探头4电连接，数据采集卡6的输入端与接收探头5电连接，数据采集卡6的输出端与上位机1的信号处理模块电连接。The connection mode of the detection device of the present embodiment is: the input terminal of waveform generator 2 is electrically connected with the signal control module of host computer 1, the output terminal of waveform generator 2 is electrically connected with the input terminal of signal amplifier 3, and the input terminal of signal amplifier 3 The output end is electrically connected to the transmitting probe 4 , the input end of the data acquisition card 6 is electrically connected to the receiving probe 5 , and the output end of the data acquisition card 6 is electrically connected to the signal processing module of the upper computer 1 .
本实施例的检测装置的工作过程为：上位机1通过信号控制模块控制波形发生器2产生经过汉宁窗调制的正弦信号，信号经过信号放大器3放大后由发射探头4往待测区域D发射，信号通过待测区域D传播后到达接收探头5，数据采集卡6采集来自接收探头5的接收信号并输送至上位机1，上位机1通过信号处理模块中的高通滤波器去除接收信号中的低频分量，通过信号处理模块中的带通滤波器获取接收信号中的非线性谐波分量，并通过信号处理模块中的计算单元对该非线性谐波分量进行小波包变换，获得小波能量值，然后基于小波能量值对非金属防腐层的分层缺陷进行评估，小波能量值越小，表明信号能量损耗越大，进而说明分层缺陷损伤越大。The working process of the detection device in this embodiment is as follows: the host computer 1 controls the waveform generator 2 through the signal control module to generate a sinusoidal signal modulated by the Hanning window, and the signal is amplified by the signal amplifier 3 and then transmitted to the area D to be tested by the transmitting probe 4 , the signal reaches the receiving probe 5 after propagating through the area D to be tested, and the data acquisition card 6 collects the receiving signal from the receiving probe 5 and sends it to the host computer 1, and the host computer 1 removes the signal in the receiving signal through the high-pass filter in the signal processing module The low-frequency component obtains the nonlinear harmonic component in the received signal through the band-pass filter in the signal processing module, and performs wavelet packet transformation on the nonlinear harmonic component through the calculation unit in the signal processing module to obtain the wavelet energy value, Then, based on the wavelet energy value, the delamination defect of the non-metallic anti-corrosion coating is evaluated. The smaller the wavelet energy value, the greater the signal energy loss, and the greater the damage of the delamination defect.
相对于现有技术，本发明采用超声波正弦信号作为检测信号，频散特性弱、能量散失低，能有效提高单次检测的检测范围；并且基于非线性响应的超声检测来反映非金属防腐层的微观变化，通过小波包变换对接收信号的非线性谐波分量进行处理，利用小波能量值作为非金属防腐层分层缺陷的衡量指标，可以较好地反映非金属防腐层的分层缺陷。本发明还搭建了由控制装置、超声探头、信号发生装置和信号采集装置组成的检测平台，控制装置控制信号发生装置产生正弦信号，信号由发射探头往待测区域发射，通过待测区域传播后到达接收探头，信号采集装置采集来自接收探头的接收信号并输送至控制装置，控制装置基于非线性响应对接收信号进行小波分析，从而可以实现对非金属防腐层分层缺陷的有效准确的检测。此外，本发明基于超声导波，利用发射探头和接收探头实现对两探头之间连线经过区域的分层缺陷检测，相比于常规的点对点检测，大大提高了检测效率。Compared with the prior art, the present invention uses an ultrasonic sinusoidal signal as the detection signal, which has weak dispersion characteristics and low energy loss, which can effectively improve the detection range of a single detection; For microscopic changes, the nonlinear harmonic component of the received signal is processed by wavelet packet transform, and the wavelet energy value is used as a measure of delamination defects of non-metallic anti-corrosion coatings, which can better reflect the delamination defects of non-metallic anti-corrosion coatings. The present invention also builds a detection platform composed of a control device, an ultrasonic probe, a signal generating device and a signal collecting device. The control device controls the signal generating device to generate a sinusoidal signal, and the signal is transmitted from the transmitting probe to the area to be tested, and after passing through the area to be tested When it reaches the receiving probe, the signal acquisition device collects the received signal from the receiving probe and sends it to the control device. The control device performs wavelet analysis on the received signal based on the nonlinear response, so that effective and accurate detection of layered defects of the non-metallic anti-corrosion layer can be realized. In addition, based on the ultrasonic guided wave, the present invention uses the transmitting probe and the receiving probe to detect layered defects in the area where the connection between the two probes passes, which greatly improves the detection efficiency compared with the conventional point-to-point detection.
以上所述实施例仅表达了本发明的一种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。The above-mentioned embodiment only expresses one implementation mode of the present invention, and its description is relatively specific and detailed, but it should not be understood as limiting the patent scope of the invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810011287.6A CN108414615A (en) | 2018-01-05 | 2018-01-05 | A kind of nonmetallic erosion resistant coating lamination defect supersonic detection method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810011287.6A CN108414615A (en) | 2018-01-05 | 2018-01-05 | A kind of nonmetallic erosion resistant coating lamination defect supersonic detection method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108414615A true CN108414615A (en) | 2018-08-17 |
Family
ID=63125722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810011287.6A Pending CN108414615A (en) | 2018-01-05 | 2018-01-05 | A kind of nonmetallic erosion resistant coating lamination defect supersonic detection method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108414615A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114689688A (en) * | 2020-12-30 | 2022-07-01 | 中国石油化工股份有限公司 | Equipment and method for detecting corrosion in high-sulfur-content oil pipeline |
| JP7177561B1 (en) * | 2021-06-11 | 2022-11-24 | 東莞理工学院 | A Method for Detecting Screw Hole Cracks in Rail Joints with Nonlinear Ultrasonic Harmonics |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940726A (en) * | 2014-04-04 | 2014-07-23 | 清华大学 | Steel chimney corrosion monitoring system and method based on non-contact ultrasonic technology |
| CN203838350U (en) * | 2014-02-26 | 2014-09-17 | 襄阳震柏地下管线检测有限公司 | Device for detection of corrosion of buried pipe through audio frequency guided wave |
| CN104777224A (en) * | 2015-04-28 | 2015-07-15 | 华南理工大学 | Defect detecting method for junction surface of metal alloy |
| CN105203632A (en) * | 2015-10-12 | 2015-12-30 | 江苏大学 | Pipeline defect type distinguishing method based on ultrasonic guided waves |
| CN105424802A (en) * | 2015-11-10 | 2016-03-23 | 华南理工大学 | Ultrasonic guided-wave detecting system for defect of composite insulator and detecting method of ultrasonic guided-wave detecting system |
| WO2017197404A1 (en) * | 2016-05-13 | 2017-11-16 | University Of North Carolina | Methods and systems for assessing material anisotropy and other characteristics |
-
2018
- 2018-01-05 CN CN201810011287.6A patent/CN108414615A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203838350U (en) * | 2014-02-26 | 2014-09-17 | 襄阳震柏地下管线检测有限公司 | Device for detection of corrosion of buried pipe through audio frequency guided wave |
| CN103940726A (en) * | 2014-04-04 | 2014-07-23 | 清华大学 | Steel chimney corrosion monitoring system and method based on non-contact ultrasonic technology |
| CN104777224A (en) * | 2015-04-28 | 2015-07-15 | 华南理工大学 | Defect detecting method for junction surface of metal alloy |
| CN105203632A (en) * | 2015-10-12 | 2015-12-30 | 江苏大学 | Pipeline defect type distinguishing method based on ultrasonic guided waves |
| CN105424802A (en) * | 2015-11-10 | 2016-03-23 | 华南理工大学 | Ultrasonic guided-wave detecting system for defect of composite insulator and detecting method of ultrasonic guided-wave detecting system |
| WO2017197404A1 (en) * | 2016-05-13 | 2017-11-16 | University Of North Carolina | Methods and systems for assessing material anisotropy and other characteristics |
Non-Patent Citations (1)
| Title |
|---|
| XIAOBIN HONG ET AL: "Crack detection in plastic pipe using piezoelectric transducers based on nonlinear ultrasonic modulation", 《SMART MATER.STRUCT.》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114689688A (en) * | 2020-12-30 | 2022-07-01 | 中国石油化工股份有限公司 | Equipment and method for detecting corrosion in high-sulfur-content oil pipeline |
| JP7177561B1 (en) * | 2021-06-11 | 2022-11-24 | 東莞理工学院 | A Method for Detecting Screw Hole Cracks in Rail Joints with Nonlinear Ultrasonic Harmonics |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Ng et al. | Debonding detection in CFRP-retrofitted reinforced concrete structures using nonlinear Rayleigh wave | |
| CN110108402A (en) | A kind of non-linear Lamb wave frequency mixing method measured for stress distribution in sheet metal | |
| Liu et al. | Adhesive debonding inspection with a small EMAT in resonant mode | |
| CN114459649B (en) | Piezoelectric transducer array-based baseline-free data plane stress field online monitoring method, system, equipment and medium | |
| CN101571513A (en) | Ultrasonic guided wave detection device for quality evaluation of composite laminated plate | |
| CN103486960A (en) | An ultrasonic, eddy current and EMAT integrated non-destructive thickness gauge and method thereof | |
| CN104407049A (en) | Micro-crack nondestructive detection system and detection method thereof | |
| CN114720560B (en) | Air coupling Lamb wave ultrasonic detection method for layered defects of carbon fiber composite material plate based on modal decomposition imaging algorithm | |
| CN102539528A (en) | System and method for detecting corrosion of storage tank base plate based on ultrasonic Lamb wave | |
| CN105651215A (en) | A Coating Thickness Measuring Method Under Unknown Ultrasonic Velocity | |
| US6205859B1 (en) | Method for improving defect detectability with magnetostrictive sensors for piping inspection | |
| CN109738518B (en) | A method and device for evaluating the effect of heat treatment of materials by nonlinear electromagnetic ultrasonic resonance | |
| CN110231400A (en) | Fine definition non-linear detection method towards automobile weld seam tiny flaw | |
| CN104777224A (en) | Defect detecting method for junction surface of metal alloy | |
| CN114705755B (en) | Defect classification and location based on Lamb wave pulse inversion and improved total focusing method | |
| CN107153095A (en) | The health detecting system and its method of work of a kind of composite plate structure | |
| Barzegar et al. | Polar coordinate for damage imaging of adhesively bonded plates using ultrasonic guided waves and laser Doppler vibrometer measurements | |
| He et al. | A novel baseline-free defect detection and localization method of welded steel plate based on reciprocity loss | |
| KR101251204B1 (en) | Ultrasonic nondestructive inspection device and ultrasonic nondestructive inspection method | |
| CN113298805B (en) | Structure surface defect detection method based on active Lamb wave acoustic emission | |
| da Silva et al. | Development of circuits for excitation and reception in ultrasonic transducers for generation of guided waves in hollow cylinders for fouling detection | |
| CN108414615A (en) | A kind of nonmetallic erosion resistant coating lamination defect supersonic detection method and device | |
| CN114062506B (en) | An air-coupled ultrasonic damage imaging system and imaging method based on non-collinear mixing technology | |
| Wang et al. | Multifrequency identification and exploitation in Lamb wave inspection | |
| Sun et al. | Damage identification in thick steel beam based on guided ultrasonic waves |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180817 |