High-power self-adaptive ultrasonic pulse emission and nonlinear ultrasonic guided wave measurement device

Abstract

The invention discloses a high-power self-adaptive ultrasonic pulse emission and nonlinear ultrasonic guided wave measurement device. The device comprises an excitation signal source unit, a self-adaptive high-voltage pulse emission unit, an echo receiving circuit and feedback unit, a digital signal processing unit and a feedback control unit. The output end of the excitation signal source unit isconnected with the input end of the self-adaptive high-voltage pulse transmitting unit and used for providing excitation signals of the system. The output end of the self-adaptive high-voltage pulsetransmitting unit is connected with the input ends of the ultrasonic transducer, the echo receiving circuit and the feedback unit through the switch unit. The output ends of the echo receiving circuitand the feedback unit are connected with the input end of the digital signal processing unit, and the output end of the digital signal processing unit is connected with the input end of the feedbackcontrol unit. According to the invention, the intensity of a transmitted signal and the sensitivity of a received signal can be improved, the noise influence is inhibited, and the characteristics of various ultrasonic transducers are adapted.

Description

technical field [0001] The invention relates to the field of ultrasonic non-destructive testing, and specifically discloses an adaptive feedback type high-voltage drive pulse emission and nonlinear ultrasonic guided wave measurement device for ultrasonic flaw detection and an adaptive nonlinear ultrasonic guided wave based on digital phase-locking technology Detection method. Background technique [0002] With the continuous development of integrated circuit technology, ultrasonic nondestructive testing technology has been widely used in the field of industrial testing. However, in actual application scenarios, there are still a series of problems to be solved. On the one hand, the insufficient transmitting power of ultrasonic waves limits the detection range and detection accuracy. Because some special industrial materials to be tested have very large acoustic impedance, it is difficult for ultrasonic waves to penetrate, and the attenuation speed of ultrasonic waves is pr...

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Problems solved by technology

[0008] According to the above deficiencies in the prior art, the object of the present invention is to provide a high-voltage pulse transmitting device with an isolated drive unit for exciting the ultrasonic transducer, aiming to improve the insufficient power and signal transmission of the existing ultrasonic transmitting circuit. Instability leads to poor driving effect on the transducer

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