Resonance transmission rod for connecting sensor in acoustic emission detection
An acoustic emission sensor and acoustic emission detection technology, which is applied in the direction of material analysis, instruments, and measurement devices using acoustic emission technology, can solve the problems of distortion, large error in detection value, and attenuation of acoustic emission signal conduction, and achieve the detection value. The effect of small error, removal of signal interference, and removal of environmental noise interference
Inactive Publication Date: 2012-11-21
GUANGXI UNIV
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[0013] From the above public documents, we can see that in order to solve the problem of acoustic emission signal propagation from the detected object to the sensor, people have proposed many methods and applied for many patents, but basically they are still limited to fastening the sensor, In terms of enhancing the coupling effect and reducing the impact of high heat on the sensor, the conduction of the acoustic emission signal to the sensor generally has shortcomings such as attenuation, distortion, and large errors in detection values.
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[0083] The acoustic emission signal that occurs when the lead is broken is typical, and it is relatively easy to obtain the signal, and it is similar to the acoustic emission signal that occurs when the solid material is broken and damaged. The lead broken signal will be used as the acoustic emission source for the verification test. Research shows that the center frequency of the acoustic emission signal from lead breaking is 80KHz, so the resonant natural frequency of the conduction rod designed below is 80KHz.
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The invention discloses a resonance transmission rod for connecting a sensor in acoustic emission detection. The resonance transmission rod is arranged on the surface of a metal device to be tested or a measure part metal, is connected with the acoustic emission sensor, and is used for detecting the fracture damage or the internal cracks of the metal device. The resonance transmission rod is characterized in that the transmission rod has a stepped integral structure formed by two metal material cylinders which have a large end and a small end respectively; the large end of the transmission rod is fastened on the metal surface of the device; the acoustic emission sensor is arranged on the small end of the transmission rod; and the dimensions of the diameters and the lengths of the large end and the small end of the stepped metal material cylinders satisfy resonance conditions. The transmission rod can generate resonance and has the energy cohesion and amplitude amplification functions under the action of an acoustic emission frequency. Test research results show that the resonance transmission rod designed according to the above mode has above ten-time amplitude amplification and frequency domain band-pass filtering functions when the resonance transmission rod is applied to the acoustic emission detection.
Description
technical field [0001] The invention relates to a device for acoustic emission signal detection, a signal transmission device between a metal material structure or equipment and an acoustic emission sensor, especially the weak sound produced by releasing stored energy when a solid material is fractured or internally cracked. A device that emits a signal that is amplified to enhance the detection or monitoring of changes within a material. Background technique [0002] There are many factors that can cause changes in internal stress during material processing, handling and use, and equipment installation, such as dislocation movement, twinning, crack initiation and propagation, fracture, non-diffusion phase transition, magnetic domain wall movement, thermal expansion and cooling These changes will seriously damage the safety of materials and equipment. When these materials or structures are deformed or broken under the action of external and internal forces, they will release...
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IPC IPC(8): G01N29/22G01N29/14
Inventor 毛汉领毛汉颖黄振峰韦花貌
Owner GUANGXI UNIV
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