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Detecting device and method based on magnetostrictive guide waves

A technology of magnetostriction and detection method, which is applied to the analysis of solids using sonic/ultrasonic/infrasonic waves, which can solve the problems of limited guided wave energy, limited detection distance, limited mechanical wave energy, etc., and achieves improved accuracy and large guided wave detection. The effect of distance and avoiding missing defect points

Active Publication Date: 2013-12-04
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when two pipes are adjacent to each other so that the distance between them and the surrounding objects is insufficient, or only part of the outer surface of the pipe is in contact, the coil cannot be wound on the entire pipe, and the coil can only be excited on a part of the surface of the pipe, resulting in limited mechanical wave energy. The guided wave energy is limited, the detection distance is limited, and it is impossible to take into account the large guided wave detection distance and the high resolution of adjacent defects in the axial direction of the pipeline

Method used

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  • Detecting device and method based on magnetostrictive guide waves
  • Detecting device and method based on magnetostrictive guide waves
  • Detecting device and method based on magnetostrictive guide waves

Examples

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Embodiment 1

[0038] Example 1, see figure 1 with figure 2, a detection device based on magnetostrictive guided waves, comprising: a signal generator 1, a power amplifier 2 connected to the signal generator 1, an excitation sensor 3 connected to the power amplifier 2, a detection sensor 4, a detection sensor 4 connected signal conditioner 5, a signal collector 6 connected to the signal conditioner 5, a PC 7 connected to the signal collector 6, and a power supply 8 for supplying power to the above-mentioned devices; wherein, the signal generator 1 is also connected to the signal The collector 6; the excitation sensor 3 includes a first permanent magnet 9 arranged axially on the pipeline and an excitation coil wound on the magnetic core of the first permanent magnet 9; the detection sensor 4 includes an axially arranged The second permanent magnet 10 on the pipeline and the detection coil wound on the magnetic core of the second permanent magnet 10 . The detection sensor 4 is 0.7m away fro...

Embodiment 2

[0040] Example 2, see Figures 1 to 8 , a detection method based on magnetostrictive guided waves, comprising the steps of:

[0041] S1. The signal generator 1 sends a coded signal to the power amplifier 2. The peak-to-peak voltage is 2V. The power amplifier 2 amplifies the power of the coded signal. The peak-to-peak voltage is 48V, and the peak-to-peak current is 20A, and then sent to Excitation sensor 3, excitation sensor 3 produces elastic wave; Simultaneously, this signal generator 1 sends trigger pulse to the signal acquisition card in the signal acquisition device 6;

[0042] S2, the signal acquisition card stores the collected echo signal in the data memory, then the PC 7 reads the data in the data memory, and stores the read data in the PC 7;

[0043] S3, zero-phase low-pass filtering, that is, the data in the PC 7 is first forward low-pass filtering, then the data is inverted, and then the signal is low-pass filtering to obtain filtered data;

[0044] S4, matched fi...

Embodiment 3

[0047] Embodiment 3 is different from Embodiment 2 in that the duration of a single transmission pulse of the encoded signal in step S1 is 100 US. The time width of the excitation signal is increased, and the energy of the excitation guided wave is increased, which not only increases the effective detection distance, but also improves the lateral resolution of adjacent defects in the radial direction of the pipeline, and improves the signal-to-noise ratio of the echo.

[0048] Preferably, the duration of the single transmission pulse of the encoded signal in the step S1 is 600US. The time width of the excitation signal is increased, and the energy of the excitation guided wave is increased, which not only increases the effective detection distance, but also improves the lateral resolution of adjacent defects in the radial direction of the pipeline, and improves the signal-to-noise ratio of the echo.

[0049] Preferably, the duration of the single transmission pulse of the enco...

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Abstract

The invention discloses a detecting device based on magnetostrictive guide waves. The detecting device comprises a signal generator, power amplifier connected to the signal generator, a excitation sensor connected with the power amplifier, a detection sensor, a signal conditioner connected with the detection sensor, a signal collector connected with the signal conditioner, a PC (personal computer) connected with the signal collector and a power device for powering the devices above. Guide wave signals are excited and detected on part of areas of the outer surface of a pipeline, and the problem that sensors surrounding the pipeline cannot by mounted due to the space between the pipeline and periphery objects is small is solved. Encoding signals are used as excitation signals, time width of the excitation signals is increased, frequency variation range of the encoding signals is set between 1kHz and 200kHz, high-pulse-compression-ratio signals are obtained through sampling signal processing and analyzing, high adjacent flaw resolution along the length direction of a to-be-detected object is achieved, and large guide wave detection range is obtained.

Description

technical field [0001] The invention relates to the field of non-destructive testing, in particular to a detection device and a detection method based on magnetostrictive guided waves. Background technique [0002] Magnetostrictive guided wave is a kind of elastic wave generated on the cross-section of the pipeline and in the steel wire rope based on the magnetostrictive effect, and propagates along the length direction of the pipeline and stay cable. When the cross-sectional area changes due to defects or mechanical The position where the impedance changes will reflect the mechanical wave, which propagates back to the position of the detection sensor, and detects the echo signal based on the inverse magnetostrictive effect. The non-destructive detection method has the advantages of single-point excitation and single-point detection without moving the sensor. And it can realize the advantages of defect detection within a range of nearly 100 meters for a single overhead pipel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/07
Inventor 张东来周智慧孙金萍张恩超
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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