Remote Acoustic Emission Monitoring of Metal Ware and Welded Joints

[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.

[发布机构] National Research Tomsk Polytechnic University, Savinykh str. 7, Tomsk; 634028, Russia^1

[效力级别] 机械制造

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