Nonlinear ultrasonic guided wave detection system and method based on linear power amplifier

Abstract

The invention relates to a nonlinear ultrasonic guided wave detection system and method based on a linear power amplifier. The system comprises a programmable controller, a linear power amplifier signal generation module, a low-frequency ultrasonic transducer, a high-frequency ultrasonic transducer, a signal acquisition module and a multi-path power supply module, wherein a program runs in the programmable controller, and the programmable controller executes the following steps of: generating a corresponding binary digital signal according to set parameters, and forming a control instruction sent to the linear power amplifier signal generation module; demodulating and restoring a digital guided wave signal obtained from the signal acquisition module, performing calculating to obtain a material nonlinear parameter carried in the restored guided wave signal, and obtaining a service life evaluation result of a to-be-tested material based on the material nonlinear parameter. The programmable controller, the linear power amplifier signal generation module, the signal acquisition module and the multi-path power supply module are integrated into one body. Compared with the prior art, thenonlinear ultrasonic guided wave detection system and method have the advantages of the high integration level, the convenience in control and the like.

Description

technical field [0001] The invention belongs to the field of industrial nondestructive testing, and in particular relates to a nonlinear ultrasonic guided wave testing system and method based on a linear power amplifier. Background technique [0002] Ultrasonic is widely used in industrial testing, such as measuring the characteristics of materials, including material material, damage degree, life testing, etc. Ultrasonic testing is divided into linear ultrasonic testing and nonlinear ultrasonic testing. The excitation ultrasonic amplitude used in linear ultrasonic testing is relatively small, within the linear range. The excitation amplitude used by nonlinear ultrasound is relatively large, which can excite the nonlinearity of materials under large stress conditions. Ultrasonic testing refers to extracting ultrasonic parameters from the measured ultrasonic signals, and looking for the relationship between ultrasonic parameters and material damage. Material damage is acco...

AI Technical Summary

Problems solved by technology

[0003] The existing nonlinear ultrasonic system is built with discrete instruments and equipment such as linear power amplifiers, signal generators, attenuators, and oscilloscopes. The equipment is bulky, complicated to connect, expensive, and inconvenient to control.

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