Remote Acoustic Emission Monitoring of Metal Ware and Welded Joints

International Scientific-Practical Conference: Innovations in Fuel and Energy Complex and Mechanical Engineering 2017

能源学;机械制造

Kapranov, Boris I.^1 ; Sutorikhin, Vladimir A.^1

National Research Tomsk Polytechnic University, Savinykh str. 7, Tomsk

634028, Russia^1

关键词: Acoustic activity;    Acoustic emission method;    Acoustic emission monitoring;    Modulation coefficients;    Nondestructive testing method;    Reflected fields;    Ultrasonic flaw detection;    Ultrasonic vibration;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/253/1/012005/pdf
DOI  :  10.1088/1757-899X/253/1/012005

来源: IOP

【 摘 要 】

An unusual phenomenon was revealed in the metal-ultrasound interaction. Microwave sensor generates surface electric conductivity oscillations from exposure to elastic ultrasonic vibrations on regions of defects embracing micro-defects termed as "crack mouth." They are known as the region of "acoustic activity," method of Acoustic Emission (AE) method. It was established that the high phase-modulation coefficient of reflected field generates intentional Doppler radar signal with the following parameters: amplitude-1-5 nm, 6-30 dB adjusted to 70- 180 mm. This phenomenon is termed as "Gorbunov effect," which is applied as a remote non-destructive testing method replacing ultrasonic flaw detection and acoustic emission methods.