Name: Materials testing with ultrasound
Price: 158 CHF
Availability: InStock
ISBN: 9783662109106

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Zurich

Lausanne

Wohlen

Basel

Kriens

Winterthur

Bern

Dietikon

St. Gallen

Geneva

Springer

The study of sound, acoustics, describes the processes of mechanical vibrations and their propagation in solid, liquid, or gaseous substances. In empty space there is no sound, because it is the particles of matter themselves that vibrate, in contrast to light vibrations or high-frequency oscillations, in which the electrical and magnetic state of space itself oscillates. A sound wave in air moves a small volume of air from its state of rest back and forth, while a light wave does not affect the state of motion of space. If we distinguish such mechanical movements in matter that recur regularly for at least some time, i.e. are periodic, by the number of periods per second, we can define a range in which our ear is suitable for detection: We hear sound when it reaches our ear through the air or our body and when its frequency is neither too low nor too high. Below about 10 Hz we do not hear a tone, nor do we above about 15,000 to 20,000 Hz. The former is only true, however, if it is a sinusoidal vibration. Other forms are decomposed by the ear into overtones, making the vibration audible as a sequence of tones or bangs. Similar to how light waves in the higher frequencies, which are no longer perceptible to our eyes, are designated as ultraviolet, sound waves above 20,000 Hz have been defined as ultrasound.

Actual product image Materials testing with ultrasound (German, Paperback, Josef Krautkrämer)

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