Defect depth detection apparatus and method based on pulsed eddy current
A pulsed eddy current and defect depth technology, which is applied in measurement devices, electromagnetic measurement devices, and electromagnetic/magnetic depth measurement, etc., can solve the problems of low detection accuracy, expensive equipment, and less research on detection methods, so as to reduce detection errors. , Improve the effect of modeling accuracy
Active Publication Date: 2019-01-01
NORTHEASTERN UNIV
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Problems solved by technology
At present, there are few studies on pulsed eddy current detection probes and detection methods for oil and gas pipeline defects, and the related equipment is expensive and the detection accuracy is low
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[0051] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0052] The method of this embodiment is as follows:
[0053] On the one hand, the present invention provides a defect depth detection device based on pulsed eddy current, such as figure 1 and figure 2 As shown, it includes: an excitation signal generator, a power amplification module, an excitation coil, a detection coil, a signal conditioning module, an A / D conversion module, and a DSP central processing unit; the excitation signal generator is connected to the input end of the power amplification module, The output end of the power amplification module is connected to both ends of the excitation coil, the detection coil is placed coaxially with the excitation coil, th...
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The invention provides a defect depth detection apparatus and method based on pulsed eddy current, which relates to the technical field of nondestructive detection. The defect depth detection method comprises the following steps: generating a period pulse signal by virtue of an excitation signal generator, amplifying the period pulse signal by virtue of a power amplification module, and then applying the period pulse signal onto two ends of an excitation coil; receiving a magnetic field signal above a test piece by virtue of a detection coil, converting the magnetic field signal to an analog voltage signal, and then outputting the analog voltage signal to a signal conditioning module; filtering and amplifying the analog voltage signal, and outputting to an A / D conversion module by the signal conditioning module; and performing the analog / digital conversion for the signal under the control of an acquisition triggering module by virtue of the A / D conversion module, sending the converteddigital signal to be identified by a characteristic parameter identification module, obtaining characteristic parameters, then sending the characteristic parameters to a defect depth detection modulebased on a random forest, and detecting the depth information of the defect on the test piece. According to the defect depth detection apparatus and method, since a physical model of the pulse eddy current detection system is established, and the influence of the sensing eddy current on the test piece for the characteristic parameters is considered, the modeling accuracy can be improved, and detection errors of the defect depth can be reduced.
Description
technical field [0001] The invention relates to the technical field of nondestructive testing, in particular to a defect depth testing device and method based on pulsed eddy current. Background technique [0002] With the gradual lengthening of oil and gas pipelines at home and abroad and the gradual increase of transportation volume, the efficient and safe transportation of oil and gas pipelines has received extensive attention. Due to long-term corrosion, wear and accidental mechanical damage, various defects will be formed in ferromagnetic oil and gas pipelines. In order to prevent leakage accidents, it is necessary to use a pipeline detection device to detect pipelines. Eddy current testing technology is a unique and low-cost high-speed large-scale testing technology with unique advantages; compared with ultrasonic method and ray method, it does not require couplant, can be non-contact measurement, and the detection speed is faster; compared with magnetic particle metho...
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IPC IPC(8): G01N27/90G01B7/26
CPCG01B7/26G01N27/9046
Inventor 冯健李铨汪刚刘金海马大中张化光卢森骧吴振宁
Owner NORTHEASTERN UNIV