A single-sided air-coupled ultrasonic scanning imaging device

Abstract

The invention relates to a single-side air-coupled ultrasonic scanning imaging device, which is used to detect defects inside objects. The device includes a probe scanning frame, a pair of plane transmitting probes and a pair of focusing receiving probes arranged on the same side of the probe scanning frame , a preamplifier, a pulse transmitter receiver, a signal acquisition and processing module and a computer, the pulse transmitter receiver is connected to a pair of planar transmitter probes, and the pulse transmitter receiver is connected to a pair of focused receiver probes through the preamplifier connected, and also connected to the computer through the signal acquisition and processing module, and the probe scanning frame is respectively connected to the computer, the pulse transmitter receiver and the signal acquisition and processing module. Compared with the prior art, the invention has the advantages of convenient focusing, high emission efficiency, high recognition resolution and the like.

Description

technical field [0001] The invention relates to the field of ultrasonic detection, in particular to a single-side air-coupled ultrasonic scanning imaging device. Background technique [0002] Ultrasonic testing is one of the five conventional non-destructive testing, because it has a series of advantages such as high sensitivity, strong penetrating power, good directivity, fast detection speed, low cost, relatively simple equipment, and harmless to the human body, it has been widely used in the industrial field. a wide range of applications. The conventional ultrasonic testing method is the contact type, that is, water or other liquid must be used as an acoustic coupling agent between the ultrasonic probe and the sample to be tested. On the one hand, the use of couplant increases the influence of human factors on the results, and on the other hand, it is difficult to meet the needs of industrial automation production and quality control. Air-coupled ultrasonic testing is a...

AI Technical Summary

Problems solved by technology

However, the transmission method cannot detect closed components such as pipelines and fuel tanks. At the same time, it is difficult to detect both sides of large components. Therefore, how to realize the single-sided air coupling detection of components has always been a research hotspot. A pair of planar air-coupled probes are used to excite and accept plate waves or guided waves at the critical angle of sound waves, but there is no commercial equipment application. The main problem is that the resolution of detecting defects is not high and cannot be accurate. Detect the internal information of the substance to be detected

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