Phased Array Ultrasonic Playing PAUT is an advanced technology of ultrasonic investigation which uses ultrasonic waves to detect the different discontinuities found in materials such as steel, aluminium, plastics etc. This technique of ultrasonic investigation is named ‘Phased Array’ because its probe has an array of transducer elements in which the timing of the elements' excitation can be individually controlled i.e. elements are pulsed in groups with pre-calculated time delays for every element i.e. phasing to produce certain desired results, such as steering the beam axis or focusing the beam to detect the discontinuity in the finest possible manner.
Introduction to NEW Ultrasonic Technology - Phased Array Ultrasonic Playing -PAUT
Phased array just like another ultrasonic investigations, was initially used in medical field and moved to the industrial sector in the mid of the 1980s only. The majority of the files from 1985 to 1992 were similar to nuclear pressure vessels nozzles, gigantic forging shafts, and weak pressure turbine components. Newest advances in piezocomposite technology, micro-machining, microelectronics, and computing power including simulation boxes for probe design and beam-component interaction, all contributed to the revolutionary development of phased array technology by the end of the 1990s. Phased array ultrasonic technology reached a commercially viable milestone by 1997 when the transportable phased array instrument, should be operated in the field by a single person, and time should be transferred and remotely analyzed in true time. The portable, battery-operated, phased array instrument is other quantum leap in the ultrasonic technology. This instrument brings phased array capabilities to daily inspection in varioius industries. Currently, the technique is getting used in numerous industrial activities such as corrosion mapping, weld inspections, rapid crack sizing, imaging and premium files.
Principles of Ultrasonic Playing:
Ultrasonic playing is a nondestructive playing way that uses high frequency 20,000 Hz sound waves to inspect materials for surface and subsurface discontinuities. In this technique, ultrasonic waves or organised mechanical vibrations are induced in an elastic medium the play piece by the piezoelectric crystal probe or transducer excited by an electrical voltage. Piezoelectric materials deform when subjected to an electric potential or voltage and generates mechanical vibrations. They also present the reverse phenomenon i.e. mechanical vibrations imposed on a piezoelectric material cause the material to generate alternating electric voltages which can be seen on the screen of the instrument. So, a transducer may act as both a generator and a detector of sound.
The ultrasonic principle is based on the fact that solid materials are nice conductors of sound waves and these waves travel through a given medium at a specific velocity in a predictable direction and if there is any discontinuity in the path of its propagation, the material would change or modify the waves that can be viewed in the form of indication, through playing system. In another words, if these waves obtain obstructed due to any type of discontinuity, they reflect back and that discontinuity gets appeared on the screen of the instrument.
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Hi, thanks for the video. I´got two questions: 1. can I Use this kind of technology in concrete? 2. How could I do the calibration for this kind of material, knowing that this is an heterogeneous media? I´m in an investigation trying to the PA technology on concrete and I searching for stats. If you can support me I acknowledge you so much. Thanks again.
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