Unilateral air coupling ultrasonic scanning imaging device and method

Abstract

The invention relates to an unilateral air coupling ultrasonic scanning imaging device and method, the device is used for internal defect detection of an object, the device includes a probe scanning frame, a pair of planar transmitting probes and a pair of focusing receiving probes, a preamplifier, a pulse transmitting receiver, a signal acquisition and processing module and a computer, the pair of planar transmitting probes and the pair of focusing receiving probes are arranged on the same side of the probe scanning frame, the pulse transmitting receiver is connected with the pair of planar transmitting probes, the pulse transmitting receiver is connected with the pair of focusing receiving probes by the preamplifier, and also is connected with the computer by the signal acquisition and processing module, and the probe scanning frame is respectively connected with the computer, the pulse transmitting receiver and the signal acquisition and processing module. Compared with the prior art, , the unilateral air coupling ultrasonic scanning imaging device has the advantages of being easy to focus, high in emission efficiency, high in identification 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 and method. 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 t...

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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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