Design Of Immersed Phased Array Ultrasonic Detection System

Additive manufacturing(3D printing)technology is increasingly used in the industrial field.Various 3D printed metal components play an important role in the industrial field.Defects hidden in the metal components have become an invisible killer of normal industrial production,and the internal defect detection of industrial components has become a key issue for people to pay attention and research.Ultrasonic inspection technology is one of the most direct and effective way to discover internal defects in industrial metal components.In view of complex shape of industrial components,poor coupling of traditional contact methods,high loss of acoustic energy,and low reliability of detection results,water immersion method was introduced to construct an phased array ultrasonic detection system.The Non-destructive testing system mainly includes three parts: motion control system,ultrasonic transmission and receiving system,and data processing and display system.For different shape and volume of components,the user can select different detection modes through the man-machine interface on the host computer client.While the offline analysis part is mainly completed in the data processing and display system,the internal defect information of the component is displayed in the visual system in the form of an intuitive image.Through the data processing and display system,the user can also easily locate the internal defects of the component and measure defects' size.In the later off-line analysis of echo signal.In the off-line analysis of echo signal,for the problem of low signal-to-noise ratio of the echo signal and low resolution of the defection image,the synthetic aperture focusing algorithm was successfully introduced to improve the resolution of detection image.Improve the system's detection capabilities.This paper starts from the principle of ultrasonic testing,proposed a scheme to improve the SNR of the echo signal by using the phased array technology for the disadvantages of slow speed,low efficiency and poor imaging performance of the common single probe.A motion control system was designed to simplify the testing process.The off-line analysis algorithm of echo data was mainly studied.The actual detection results were used to verify the feasibility of the design scheme and the effectiveness of the SAFT algorithm.The content mainly covers the following aspects:(1)The design and construction of the hardware platform of the motion control system,the design of the probe ultrasonic scanning mode(path),and the automatic scanning of the probe;(2)Development of Human-computer interaction interface,communication between host computer and controller;The GUI is simple and intuitive,simplify the ultrasonic testing process;(3)Debug the function of the designed system to verify the flaw detection effect.Designed the appropriate scanning method for 3D printed metal component.Completed Ultrasonic testing of the 3D printing metal component;(4)After the detection experiment,off-line analysis is performed based on the scanned echo data,analyzed the actual detection effect.In order to solve the problem of low resolution of the defects in the ultrasonic imaging and poor reliability of the detection result,introduced Synthetic Aperture Focusing(SAFT)algorithm to enhance resolution of defect image.Improved testing system performance.