超聲波簡介及其應用外文翻譯-展示頁
2025-05-26 16:05本頁面
【正文】 y 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 metal air holes, flaws and layer defects such as defects in a gas or a mixture, when defects at the interface of ultrasonic propagation to the metal and on all or part of the reflection. Reflected ultrasonic probe received, handled through circuits inside the instrument, on the screen of the instrument will show a different height and have a certain pitch on waveform characteristics of determine defect depth, location, and shape of the workpiece. Non destructive testing is not damaged parts or raw materials subject to the status of the work, a means of detection of surface and internal quality checks, Nondestructive Testing abbreviations short for NDT. Ultrasonic testing is also called ultrasonic, ultrasonic flaw detector, is a type of non destructive testing. UT is on industrial ultrasonic testing non destructive testing methods. Ultrasonic enters objects when a defect is encountered, some sound waves produce reflection, transmit and receive an analysis of the reflected wave, exception can accurately gauge the flaws. And is able to display the location and size of internal defects, determination of material thickness. Advantages of ultrasonic inspection is to detect thickness, high sensitivity, high speed, low cost, is harmless to human body, can be positioned and quantitative defects. Display of ultrasonic
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