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Shielding type wave guide rod for acoustic emission detection

An acoustic emission detection and probe technology, which is used in material analysis using acoustic emission technology, material analysis using acoustic/ultrasonic/infrasonic waves, and measuring devices, etc., can solve the problem of simple structure and low signal-to-noise ratio of the probe. , the inability to obtain the local acoustic emission signal of the gas-solid system, etc., to achieve the effect of strong anti-interference ability, low production cost and flexible design

Inactive Publication Date: 2021-01-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the probes reported in the literature have simple structures, mostly homogeneous metal rods or metal meshes.
The signals measured by these simple probes include both the acoustic signal received at the end point of the probe and the acoustic signal received by other parts of the device. It is impossible to obtain the local acoustic emission signal in the gas-solid system. low signal-to-noise ratio

Method used

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  • Shielding type wave guide rod for acoustic emission detection
  • Shielding type wave guide rod for acoustic emission detection
  • Shielding type wave guide rod for acoustic emission detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] figure 1 and 2 It is a structural schematic diagram of a shielded probe for acoustic emission detection provided by the present invention. The structure of the shielded probe includes an acoustic wave shielding layer 1, a probe core 2, and a probe fixing device 3, wherein the acoustic wave shielding layer includes a stainless steel layer 5 and an air layer 6, thereby forming a stainless steel / air interface. The thickness of the stainless steel layer is 0.5 mm, and the thickness of the air layer is 2 mm. The sound wave shielding layer is covered with a rubber layer 4 (the damping coefficient of the material is greater than 0.1), and the thickness of the rubber layer is 2 mm. The non-ideal elastic collision between the particles in the reactor to be tested and the rubber layer is used to reduce the energy of the noise source signal, and at the same time, the reflection of the sound wave on the steel / air is used to shield the sound wave signal except for the position to ...

Embodiment 2

[0027] The structure of the shielded probe for acoustic emission detection in this embodiment is as follows: Figure 4 As shown, the difference from Example 1 is that the front end of the shielded probe is not bent, which can be used to measure the acoustic signal generated by the friction between the particle and the waveguide surface at a local position in the device, and at the same time avoids the bending of the probe bend section. Interference in multiphase flow systems.

Embodiment 3

[0029] The difference between this embodiment and Embodiment 2 is that: the shielded probe contains two probe cores, and the probe cores are stainless steel rods with a diameter of 1 mm. The two probe cores in the acoustic shielding layer are parallel to each other, and the shortest distance between the outer surfaces of the two probe cores is 0.001 meters. Through two probe cores, two acoustic emission sensors are coupled to simultaneously collect acoustic signals at adjacent positions in the multiphase fluid system, which can be used to measure the axial or radial particle velocity components in the system.

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Abstract

The invention discloses a shielding type wave guide rod for acoustic emission detection. The shielding type wave guide rod comprises an acoustic wave shielding layer, a wave guide rod core and a probefixing end; the acoustic wave shielding layer is arranged on the outer side of the wave guide rod core, and by constructing a high-acoustic-impedance material / low-acoustic-impedance material interface, reflection of acoustic waves at the interface is enhanced, propagation of the acoustic waves is reduced, and interference signals are shielded; the end surface of one end of the wave guide rod coreis not provided with the acoustic wave shielding layer to form a wave guide plane or a wave guide body; and the other end of the wave guide rod core is connected with a probe fixing end for couplingan acoustic emission sensor to realize acoustic emission signal acquisition. The shielding type wave guide rod is simple in structure and convenient to use, and can be used for measuring local acoustic emission signals in different directions in a multiphase flow system under complex working conditions.

Description

technical field [0001] The invention belongs to the field of multiphase flow information detection, and in particular relates to a shielded probe for acoustic emission detection. Background technique [0002] Acoustic emission detection technology has the characteristics of real-time online detection and environmental protection, and has been widely used in the field of multiphase flow information detection. For some extremely harsh working conditions such as high temperature, cryogenic temperature, and nuclear radiation, conventional acoustic emission sensors cannot be used for detection. Usually, a probe made of metal or ceramics is used to transmit the surface acoustic wave signal of the device under test to the sensor at the normal temperature end. Realize the collection of acoustic emission signal. [0003] Probe-assisted acoustic emission testing has been successfully applied. CN201010588856.7 collects the acoustic emission signal in the reactor through the high temp...

Claims

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Application Information

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IPC IPC(8): G01N29/22G01N29/14G01N15/00
CPCG01N29/222G01N29/14G01N15/00G01N2015/0003
Inventor 黄正梁盛涛杨遥张鹏孙婧元蒋斌波廖祖维阳永荣
Owner ZHEJIANG UNIV