Resonance transmission rod for connecting sensor in acoustic emission detection

Abstract

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...

AI Technical Summary

Problems solved by technology

[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.

Images