The Doppler Detection Fault

Abstract

In the study of the interaction of ultrasound with metals discovered an unusual phenomenon. Microwave sensor indicates fluctuations of electric surface conductivity when exposed to elastic ultrasonic vibrations in metal objects. The defective area is characterized by a content of microdefects of the type "the mouth of the cracks". They are known as the field of "acoustic activity" the method of Acoustic Emission (AE). The high coefficient of phase modulation of the reflected field allows you to indicate the Doppler signal is useful for 6-30 dB over the noise from a distance of 70-180 mm. The phenomenon is called "of Gorbunov effect". It has been successfully used as remote non-destructive testing method is ultrasonic methods of flaw detection, acoustic emission. It has been successfully used as remote non-destructive testing method that replaces the ultrasonic methods of flaw detection, acoustic emission.