Integrated impulse ultrasound-sound transmitting transducer for detecting composite materials

Abstract

The invention relates to an integrated impulse ultrasound-sound transmitting transducer for detecting composite materials. The integrated impulse ultrasound-sound transmitting transducer comprises a piezoelectric sensing element, a transducer shell, a damping back lining block, a delaying block, an electrode, a connecting base, a sealing cover and a locking ring; a broadband piezoelectric crystal is used for ultrasonic excitation and sound transmitting signal receiving and belongs to the integrated impulse ultrasound-sound transmitting transducer; the integrated impulse ultrasound-sound transmitting transducer has small volume, good time domain pulse characteristics, high detection sensitivity, high resolution ratio, clear law of ultrasound-sound transmitting signals, good accuracy on qualitatively and quantitatively detecting defects, and good applicability, can be used for manual scanning detection, automatic scanning detection and defect imaging analysis of parts with different composite materials, and can remarkably improve the ultrasonic inspection resolution ratio and a surface non-detection zone of the composite material and greatly improve the detect detection capability of the composite materials, the detection thickness can reach 50mm, the detection sensitivity to defects with phi3mm and the depth of 45mm can be achieved, and the frequency selection range is 1-7.5MHz.

Description

Technical field [0001] The invention belongs to non-destructive testing technology, and relates to an integrated pulsed ultrasonic for testing composite materials for non-destructive testing of composite materials and metal material structures in the fields of aviation, aerospace, weapons, ships, metallurgy, steel, transportation, construction, etc. Acoustic emission transducer. Background technique [0002] Ultrasound is currently an important method widely used for quantitative non-destructive testing of various materials and their structural defects. It has been widely used in aerospace, weapons, electronics, shipbuilding, metallurgy, petrochemical petroleum, transportation, construction and other fields, especially in composite materials In the field, currently 80% of composite material structures have adopted ultrasonic testing. At present, the ultrasonic detection methods used for composite materials mainly include reflection method and penetration method. The reflection / t...

AI Technical Summary

Problems solved by technology

At present, the ultrasonic testing methods for composite materials mainly include reflection method and penetration method. Using external ultrasonic pulse sound source, the reflection / transmission sound wave behavior formed in the tested composite material is used to detect and discriminate defects. The main disadvantages are : (1) It is very sensitive to the orientation of the defect. As the angle between the orientation of the defect and the propagation direction of the incident sound wave increases, the detection ability of the defect will decrease significantly, which will easily cause missed detection; (2) The sound wave attenuation is severe, and it is difficult to Realize non-destructive testing of materials with severe acoustic attenuation such as large-thickness composite materials and porous composite materials

Its main disadvantages are (1) the volume is too large and synchronization is difficult; (2) the geometric scanning blind area is large; (3) the time-domain pulse characteristics of the transducer are poor; (4) the resolution and detection sensitivity are low, and the detection signal law is complicated , the qualitative and quantitative defects are difficult

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