RTE UTZ
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44 Terms
1918
What year was Sound Navigation and Ranging used?
Infrasound
refers to sound waves with frequencies below 20
Hz, which are typically below the range of human
hearing but may be audible at high intensities
Volcanic eruptioms
Earthquakes
Ocean waves
Natural source of infrasound include?
Explosions
Industrial machinery
Wind turbines
Human made infrasound sources
Inaudible sound
frequencies below 20 Hz (infrasonic) or above
20 kHz (ultrasonic), which are beyond human
hearing
Inaudible feequencies
are widely used in
medical applications, such as ultrasound
imaging for diagnostics.
Audible sound
frequencies between 20 Hz and 20 kHz, which
the human ear can detect
ultrasound
refers to sound waves with frequencies above kHz,
beyond the range of human hearing, used in
various applications
Diagnostic ultrasound
a medical application of ultrasound technology
used to create real-time images of internal
organs, tissues, and blood flow
Longitudinal / Compression waves
are waves in which the particles of the medium
move parallel to the direction of the wave’s
propagation
Sound waves in air are a common example
Transverse / Shear
are waves in which the particles of the medium
move perpendicular to the direction of the wave’s
propagation
Light waves, electromagnetic waves, water waves
Surface / Rayleigh
are seismic waves that travel along the Earth’s
surface, causing the most damage during
earthquakes
● They move slower than body waves but have larger
amplitudes, resulting in stronger ground shaking.
Period
Wavelength
Frequency
Amplitude
Velocity
ACOUSTIC VARIABLES
Period (T)
is the time it takes for one complete cycle of a wave to pass a given point, usually measured in seconds.
Wavelength
length of one wave cycle
Amplitude
maximum displacement of a variable
Frequency
cycles per second
Velocity
frequency x wavelength
short, better
long, deeper
High frequency → _____ wavelength → ______ resolution
Low frequency → ______ wavelength → _____ penetration
frequency
iIt directly affects image quality and depth
penetration
Short wavelength
Better resolutuon
Lesser penetration
More absorption
High frequency means?
Bandwidth
Range of frequencies in an ultrasound pulse
Short spatial pulse length
Wide range of frequency
Wide bandwidth means?
Physical Housing
Electrical Connections
Piezoelectric Elements
Matching Layer
Acoustic Lens
Backing layer
COMPONENTS OF TRANSDUCER