科研之友
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摘要
In view of the fact that the traditional ultrasonic penetrating different-side detection method is affected by the arrangement of the transducer and requires a high-sensitivity detection device, the detection signal amplitude of the specimen with a larger thickness is lower. This article proposes a non-contact air-coupled ultrasonic non-destructive testing technology based on the penetrating ipsilateral detection mode(v transmission method)to be applied to the detection of foam materials. First, the basic principle of the air-coupled ultrasonic v-transmission method detection mode is briefly explained, and then the non-contact air-coupled ultrasonic sound velocity measurement of foam materials by the v-transmission method and the detection of its internal defects are introduced. The traditional ultrasonic detection method is successfully detected. Foam material defects that are difficult to be detected and imaged; finally, using air-coupled ultrasonic ipsilateral v transmission method point acquisition method, the probe is used to synchronously scan the damage along two mutually orthogonal directions to obtain the defect area amplitude curve and use 6 dB The quantitative results of the method show that the use of the air-coupled ultrasonic ipsilateral v transmission method has a higher quantitative accuracy, and the error is less than 20%, which meets the actual detection accuracy.
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