Full-focusing imaging detection method based on ring array transducer

Abstract

The invention provides a full-focusing imaging detection method based on a ring array transducer and belongs to ultrasonic non-destructive testing. The method comprises the following steps: setting a detection imaging region as a linear region along the axial direction of the ring array transducer; clamping the ring transducer with a mechanical clamp to scan the detection regions, successively motivating single array elements when the detection regions are scanned, wherein all array elements receive ultrasonic echo time domain signals for every motivation to form full matrix data of the detection regions; discretizing each detection region to a plurality of detection points, determining the sound wave spreading paths at the detection points according to the Fermat principle to obtain the spreading times, fully focusing the full matrix data collected to monitoring points by means of a time delay method to obtain the amplitude of the detection points. The method can generate a relatively strong sound field under the circumstance of using few array elements, so that the circuit control complicated degree is greatly reduced, the detection thickness and detection precision are improved, and intelligence and efficiency of detection can be realized.

Description

technical field [0001] The invention relates to an ultrasonic non-destructive testing method, in particular to an all-focus imaging testing technology based on an annular array transducer for ultrasonic testing of materials with high thickness and high attenuation. Background technique [0002] Ultrasonic non-destructive testing is to use the interaction between ultrasonic waves and the test piece to study the reflected, transmitted and scattered ultrasonic waves, and to perform macroscopic defect detection on test pieces such as metals, plastics, composite materials, ceramics, rubber and glass. Measurement of geometrical properties, detection and characterization of tissue structure and changes in mechanical properties. [0003] Array ultrasonic testing technology is one of the most widely used detection technologies in ultrasonic nondestructive testing technology, and it is also one of the most active applications and researches in the field of ultrasonic nondestructive te...

AI Technical Summary

Problems solved by technology

[0008] For the ultrasonic non-destructive testing of materials with strong anisotropy such as additive manufacturing structures, linear array transducers and rectangular array transducers are currently used, due to the strong attenuation of the sound beam energy due to the anisotropy of the material, As a result, it is necessary to use more array elements for detection, but the detection results are still not ideal. The present invention utilizes the characteristics of the annular array transducer to generate a stronger focused sound field with fewer array elements, and provides a ring-array-based transducer. Omni-focus imaging detection method of transducer

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