Mercantile
发表于 2025-3-27 00:21:14
Book 19904th edition book from the physical fundamentals of ultrasonics and materials up to the most sophisticated methods. The book is written at a level which should make it accessible to readers with some knowledge of technical mathematics. Physical laws are explained in elementary terms, and more sophisticated trea
的阐明
发表于 2025-3-27 05:08:59
Piezo-electric Methods of Generation and Reception of Ultrasonic Waves are referred to in materials testing as a ., or ., and where applicable as a transmitting probe or a receiving probe. We shall now discuss its mode of operation, which is based almost exlusively on the piezoelectric effect. Other methods for generating ultrasonics are discussed in Chapter 8.
Irritate
发表于 2025-3-27 08:56:10
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Allure
发表于 2025-3-27 11:17:54
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减去
发表于 2025-3-27 16:36:19
Geometrical Acousticssing reflection and refraction in Chapter 2. In this connection it should, however, not be overlooked that this method fails to take into account a very important property, both of light waves and ultrasonic waves, viz. the wave structure.
Magnitude
发表于 2025-3-27 20:40:20
Attenuation of Ultrasonic Waves in Solidsrease inversely with the distance from the source. Natural materials, however, all produce a more or less pronounced effect which further weakens the sound. This results from two basic causes, viz. scattering, and true absorption, which are both combined in the term . (sometimes also called extinction).
Anguish
发表于 2025-3-28 01:13:14
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杠杆
发表于 2025-3-28 04:26:04
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gentle
发表于 2025-3-28 06:19:00
ed in this book from the physical fundamentals of ultrasonics and materials up to the most sophisticated methods. The book is written at a level which should make it accessible to readers with some knowledge of technical mathematics. Physical laws are explained in elementary terms, and more sophisti
假装是我
发表于 2025-3-28 10:41:49
Plane Sound Waves at Boundariesss of the boundary should be measured in terms of the wavelength. If another material is beyond the boundary, and adheres to the first material so that forces can be transmitted, the wave can be propagated into it, although usually in a more or less changed direction, intensity and mode.