CN109085238B - 扭转模态导波管道检测中焊缝与卡箍反射信号的识别方法 - Google Patents

扭转模态导波管道检测中焊缝与卡箍反射信号的识别方法 Download PDF

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CN109085238B
CN109085238B CN201810772531.0A CN201810772531A CN109085238B CN 109085238 B CN109085238 B CN 109085238B CN 201810772531 A CN201810772531 A CN 201810772531A CN 109085238 B CN109085238 B CN 109085238B
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guided wave
welding seam
torsional mode
pipeline
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CN109085238A (zh
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郭文鑫
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Zhongyao Qixing (Nanjing) Technology Co.,Ltd.
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    • 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
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    • 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
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Abstract

本发明公开了扭转模态导波管道检测中焊缝与卡箍反射信号的识别方法，利用扭转模态导波对管道进行缺陷检测时，导波遇到管线上的固有焊缝和后安装的卡箍时均会产生反射信号。在对检测信号进行识别时，需要对焊缝和卡箍反射信号进行标记。本发明提出利用多频扭转模态导波在焊缝和卡箍处具有不同反射特性的原理，区分焊缝和卡箍反射信号：焊缝反射信号幅值随检测导波频率增加呈先增后减趋势，卡箍反射信号幅值随检测导波频率增加呈单调递减趋势。

Description

扭转模态导波管道检测中焊缝与卡箍反射信号的识别方法
技术领域
扭转模态导波管道检测中焊缝与卡箍反射信号的识别方法，属于超声导波无损检测技术领域，其作用在于对管道导波检测结果中的焊缝和卡箍反射信号进行有效区分。
背景技术
扭转模态导波管道检测技术可实现长距离内缺陷的定位检测。在实际检测时，导波遇到管线上的固有焊缝和后安装的卡箍时均会产生反射信号。在对检测信号进行识别时，需要对焊缝和卡箍反射信号进行标记。但目前还没有很好的方法对这两种结构的反射信号进行区分。针对该问题，本发明提出了扭转模态导波在焊缝与卡箍处反射信号的识别方法，具体为：采用不同频率的扭转模态导波对管道进行检测，随着检测频率的增加，焊缝与卡箍处的反射信号幅值呈现不同的变化规律，通过该规律的判读，对焊缝和卡箍反射信号进行识别。
发明内容
本发明的目的是提出一种检测及信号识别方法，对管道中焊缝和卡箍处的扭转模态导波反射信号进行区分。
为实现上述目的，本发明采取如下技术方案：
扭转模态导波管道检测中焊缝与卡箍反射信号的识别方法，该方法是一种在管道(1)中焊缝(2)与卡箍(3)处扭转模态导波反射信号的识别方法，该方法利用固定安装于管道(1)上的传感器(4)先后激发多个频率的扭转模态导波对管道进行检测，多个频率分别为16kHz、32kHz、64kHz、128kHz和256kHz，由此获得反射信号随导波激发频率的变化规律：对于焊缝(2)的反射信号，信号幅值随导波激发频率增加而呈先增后减趋势，卡箍(3)的反射信号幅值随检测导波频率增加呈单调递减趋势。即对管道(1)中焊缝(2)与卡箍(3)处扭转模态导波反射信号进行有效识别。
本发明可以获得如下收益：
可有效区分管道中焊缝和卡箍处扭转模态导波反射信号，利于扭转模态导波管道检测信号的识别。
附图说明
图1管道检测装置示意图。
图2不同导波激发频率时的焊缝与卡箍反射信号。
图3焊缝与卡箍反射信号幅值随导波激发频率的变化规律。
图中：1-管道 2-焊缝 3-卡箍 4-传感器。
具体实施方式
根据以上发明内容，结合附图对焊缝与卡箍反射信号的识别方法提供以下实施方式：
在图1所示，在管道(1)的某位置安装传感器(4)，激发扭转模态超声导波对管道(1)进行检测，导波遇到管道(1)中的焊缝、卡箍等结构时，将产生反射回波，各回波的传播路径如图1所示。
当激发频率分别为32kHz、64kHz和128kHz时，检测到的典型信号如图2所示。通过对比不同频率的检测信号，可以发现：回波T4来自卡箍反射信号，其随着激发导波频率的增加，反射信号的幅值呈单调下降趋势；回波T5来自焊缝反射信号，其随着激发导波频率的增加，反射信号幅值先增后减。
实际焊缝和卡箍处的扭转模态导波反射信号幅值随激发导波频率的变化规律如图3所示。利用图3所示的变化规律，结合图2所示的多频导波检测信号，即可对焊缝和卡箍处的反射信号进行区分。
利用扭转模态导波对管道进行缺陷检测时，导波遇到管线上的固有焊缝和后安装的卡箍时均会产生反射信号。在对检测信号进行识别时，需要对焊缝和卡箍反射信号进行标记。本发明提出利用多频扭转模态导波在焊缝和卡箍处具有不同反射特性的原理，区分焊缝和卡箍反射信号：焊缝反射信号幅值随检测导波频率增加呈先增后减趋势，卡箍反射信号幅值随检测导波频率增加呈单调递减趋势。

Claims (1)

1.扭转模态导波管道检测中焊缝与卡箍反射信号的识别方法，该方法是一种在管道(1)中焊缝(2)与卡箍(3)处扭转模态导波反射信号的识别方法，其特征在于：该方法利用固定安装于管道(1)上的传感器(4)先后激发多个频率的扭转模态导波对管道进行检测，多个频率分别为16kHz、32kHz、64kHz、128kHz和256kHz，由此获得反射信号随导波激发频率的变化规律：对于焊缝(2)的反射信号，信号幅值随导波激发频率增加而呈先增后减趋势，卡箍(3)的反射信号幅值随检测导波频率增加呈单调递减趋势；即对管道(1)中焊缝(2)与卡箍(3)处扭转模态导波反射信号进行有效识别。
CN201810772531.0A 2018-07-13 2018-07-13 扭转模态导波管道检测中焊缝与卡箍反射信号的识别方法 Active CN109085238B (zh)

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