超聲波簡介及其應用外文翻譯(文件)
【正文】 和方向傳播，遇到聲阻抗不同的異質(zhì)界面（如缺陷或被測物件的底面等）就會產(chǎn)生反射。 M type display is will a section after fai of processing of detection information by time order expand formation a dimension of space more points movement timing figure , for observation internal is movement state of object , ultrasonic flaw detector as movement of organ , and artery vascular。襄樊學院 畢業(yè)設計 (論文 )英文翻譯 題 目 超聲波簡介及其應用 專 業(yè) 機械設計制造及其自動化 班 級 機制 0712 姓 名 劉康 學 號 07116201 指導教師 職 稱 李梅 副教授 2020 年 5 月 25 日 Introduction and application of ultrasonic Ultrasonic is a mechanical waves which frequency above 20,000 Hz. Ultrasonic inspection monly used in the frequency of 0. 5~5 MHz. The mechanical waves in the material spread in a certain speed and directions, acoustic impedance different heterogeneous interfaces such as defect is encountered or the bottom surface of the object being tested, will reflections. This reflection phenomenon can be used to ultrasonic testing , most mon is pulse echo testing method testing , pulse oscillator issued of voltage plus in probe with pressure electric ceramic or quartz chip made of detection ponents , probe issued of ultrasonic pulse by sound coupled media such as oil or water , entered material and in which spread , encountered defects , part reflection energy along original way returns probe , probe will change it in electric pulse , by instrument zoom and display in oscilloscope tubes of screen . Depending on where the flaw echo on the screen and amplitude of reflection wave with artificial defects in a reference block rate pared to defect location and approximate dimensions. Apart from Echo method, and use another probe to the other side of the workpiece to accept signal peration method. When use ultrasonic detection the physical properties of materials, also often take advantage of ultrasonic in sound velocity, attenuation and resonance characteristics of workpiece. Ultrasonic characteristics: 1, ultrasonic beam to focus on a specific direction, along the straight lines in the media, has a good point. 2, ultrasonic wave propagation in the media, attenuation and scattering occurs. 3, ultrasonic wave on the interface of heterogeneous media will make reflection, refraction and mode conversion. Using these features, you can get the defective interface from reflected reflection, so as to achieve the purpose of detecting defects. 4, ultrasonic energy is power than sonic. 5, the ultrasonic loss is very small in solid transmission , probe depth, as occurs in the hetero interface by ultrasonic phenomena such as reflection, refraction, especially not by gas solid interface. If the
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