Nonlinear ultrasonic imaging detection method based on automatic scanning

Abstract

The invention belongs to the technical field of non-destructive detection, and relates to a nonlinear ultrasonic imaging detection method based on automatic scanning. The nonlinear ultrasonic imaging detection method is mainly implemented as follows: a nonlinear ultrasonic unit, nonlinear ultrasonic detection signal acquisition and nonlinear ultrasonic imaging. The nonlinear ultrasonic unit comprises an ultrasonic automatic scanning detection device, a transmitting transducer, a receiving transducer, an ultrasonic unit, a pre processor and the like. By the transmitting transducer and the receiving transducer a nonlinear ultrasonic detection signal is obtained. The nonlinear ultrasonic imaging includes imaging position data construction and imaging display, and comprises the following main steps: determining an automatic scanning mode, arranging and clamping parts, setting parameters, scanning for imaging and the like. Ultrasonic automatic scanning detection equipment with 1-6 coordinate freedom degrees is used for realizing high sensitivity and high resolution nonlinear ultrasonic automatic scanning imaging detection of the parts with different shaped, sized and structured, and the detection capability and reliability of clinging defects and micro defects can be significantly improved.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing and relates to a non-linear ultrasonic imaging testing method based on automatic scanning. Background technique [0002] With the popularization and application of composite materials and diffusion welding in core industrial fields such as aerospace and transportation, it is necessary to conduct non-destructive testing on composite materials and diffusion welding connection interfaces used in installed equipment to ensure the quality and service safety of installed structures. Due to the close and subtle characteristics of the connection interface defects in composite materials and diffusion welding, all detection methods are required to have high enough detection sensitivity and detection resolution, and are oriented to the actual manufacturing process of engineering-grade composite materials and diffusion welding structures. The non-destructive testing of parts mainly adopts the ...

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Problems solved by technology

The outstanding deficiencies are: (1) These two methods are currently mainly based on the conventional linear ultrasonic testing principle, which is insensitive to adhesion defects and fine defects at the connection interface, and has poor resolution. Although increasing the frequency of ultrasonic testing, it can be improved to a certain extent. On the one hand, the ultrasonic method can improve the sensitivity and resolution of the detection of adhesion defects and micro-defects on the connection interface, but the detection frequency increases, the attenuation of the sound wave is severe, the detection thickness is limited, and the coupling of the detection signal to the high-frequency ultrasonic transducer and the The abnormal sensitivity of posture directly affects the reliability of detection; (2) Some close-fitting and fine connection defects are not sensitive to the large amplitude caused by linear ultrasonic waves around the defect, which may easily cause missed detection; (3) The increase of detection frequency will lead to The sharp increase in inspection costs has even made it difficult to achieve ultrasonic inspection of actual parts

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