Identification of false defect signals and the method of using them to improve the accuracy of pipeline non-destructive testing
A technology of non-destructive testing and pipeline testing, which is applied in the direction of processing detection response signals and using acoustic wave emission technology for material analysis, etc. Effects of interference, improving efficiency and accuracy
Active Publication Date: 2016-05-11
NAVAL UNIV OF ENG PLA
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However, in practical applications, guided wave detection still has other interference effects, so that the detection accuracy is still not high enough, resulting in the application of guided wave detection is still subject to certain limitations
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[0036] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0037] According to the embodiment of the present invention, a method for improving the detection accuracy of non-destructive testing of ultrasonic guided wave pipelines by identifying false defect signals includes the following steps:
[0038] Firstly, the collected pipeline defect detection signal is analyzed and processed, and the false defect signal is identified. The false defect signal is ...
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Abstract
The invention provides a method for improving ultrasonic guided-wave pipeline nondestructive testing precision. The method comprises the steps that collected pipeline flaw detection signals are analyzed and processed, a reflected signal corresponding to the non-real position in two reflected signals, corresponding to two different positions, generated by a flaw in the same position of a pipeline in the spread process is recognized, used as a pseudo-flaw signal and is eliminated, and therefore noise suppression on the detection signals in ultrasonic guided-wave pipeline nondestructive testing is achieved, and detection precision is improved. The invention discloses a corresponding recognition method for the pseudo-flaw signal in ultrasonic guided-wave pipeline nondestructive testing and application of the method in ultrasonic guided-wave pipeline nondestructive testing. The flaw detection signals are analyzed and processed, the pseudo-flaw signals existing in the flaw detection signals are recognized and then eliminated, and therefore the influence of signal noise in ultrasonic guided-wave pipeline nondestructive testing is reduced, and the detection precision is greatly improved.
Description
technical field [0001] The invention belongs to the technical field of non-destructive testing, and in particular relates to a method for identifying a false defect signal and a method for improving the precision of non-destructive detection of an ultrasonic guided wave pipeline by identifying the false defect signal. Background technique [0002] Guided wave detection technology is an efficient pipeline detection technology, which has the advantages of non-contact, fast, long detection distance and the ability to detect the entire pipeline volume. However, due to the existence of noise or various disturbances, the detection accuracy is affected. [0003] In order to overcome the influence of various noise or interference factors on the accuracy in guided wave detection, there are currently many schemes to suppress noise or improve the recognition of defect detection signals. For example, patent document CN101082603A discloses a method for suppressing noise of complex compo...
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IPC IPC(8): G01N29/14G01N29/44
Inventor 王悦民耿海泉陈乐伍文君吴昕
Owner NAVAL UNIV OF ENG PLA