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Speed of sound in solid objects for solid objects the

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Unformatted text preview: per unit length (1) Hard magnetic shell (2) Soft magnet core (3) Directions of magnetisation (4) Fig. 11.2.9: Wiegand sensor 174 © Festo Didactic GmbH & Co. KG • FP 1110 11. Physical fundamentals 11.3 Sound frequency which is above the limit of human hearing is described as Fundamentals of ultrasonic- ultrasound. The lower limit is at approximately 20 kHz. The particular characteristics of ultrasound applied to proximity sensors are the result of the high frequency and proximity sensors the correspondingly short wavelength. 10 1 Infra (1) 100 1k 10 k 2 Audible (2) 100 k 1M 10 M 100 M 1G 3 Ultra (3) (Hz) 4 Hypersound (4) Fig. 11.3.1: Sound frequency range The propagation of sound is the result of propagation of mechanical long waves, which manifests itself in a periodic density variation in the carrier medium, leading to alternating compressions and dilutions. The propagation of sound waves is dependent on a transmitting medium, it is not possible in a vacuum. Speed of sound in solid objects For solid objects, t...
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