By Jim Mesko
A- 26 Invader in motion - Squadron/Signal 1134 КНИГИ ;ВОЕННАЯ ИСТОРИЯ Издательство: Squadron/Signal courses Серия: airplane 134 Название: A-26 Invader in motion Язык: English Год издания: 1993 Количество страниц: forty nine ISBN: 0-89747-296-9 Формат: pdf Размер: 10.8 mb eighty five
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TT is particularly suitable for the detection of porosity; in particular, it has been demonstrated that the slope of the attenuation curves, which depends on the frequency of the applied ultrasonic signal, can be directly related to the amount of porosity in the material under inspection . This technique is also used for the estimation of the impact damage, to evaluate the extension of the damaged areas and to determine the ﬁbres’ orientation. 10 Ultrasonic conﬁgurations. (a) Through transmission and (b) Pulse echo.
Personal central certiﬁcation: within this approach NDT operators obtain certiﬁcation from a central certiﬁcation authority, which is recognized by most employers, third parties and/or government authorities. Industrial standards for central certiﬁcation schemes include ISO 9712  and ANSI/ASNT CP-106 . Another central certiﬁcation scheme, very similar to ISO 9712, is the EN 473 , which was withdrawn when the European Committee for Standardization replaced it with EN ISO 9712 in 2012. In the United States, employer-based schemes are the norm, however, central certiﬁcation schemes exist as well.
Calibration and testing should be performed under similar coupling conditions, with the minimum amount of couplant and constant pressure on the transducer. 1 Ultrasonic Testing Techniques There are two main techniques to carry out UT: through transmission (TT) and pulse echo (PE). In TT, two transducers are necessary, which are coupled at opposite sides of the inspected component. One transducer acts as a transmitter and the other one as a receiver (Fig. 10(a)). With this conﬁguration, the presence of a discontinuity is discovered through the variation it induces to the amplitude of the received signal.
A- 26 Invader in Action by Jim Mesko