Everything about Surface Acoustic Wave totally explained
A
surface acoustic wave (
SAW) is an
acoustic wave traveling along the surface of a material having some
elasticity, with an
amplitude that typically decays exponentially with the depth of the substrate. This kind of
wave is commonly used in devices called
SAW devices in
electronics circuits. SAW devices are employed as
filters,
oscillators and
transformers based on the
transduction of acoustic waves. The transduction from electric energy to mechanical energy (in the form of SAWs) is accomplished by the use of
piezoelectric materials.
Discovered in 1887 by
Lord Rayleigh who reported the surface acoustic wave mode of propagation and in his classic paper predicted the properties of these waves. Named for their discoverer,
Rayleigh waves have a longitudinal and a vertical shear component that can couple with a medium in contact with the device’s surface. This coupling strongly affects the amplitude and velocity of the wave allowing SAW sensors to directly sense mass and mechanical properties.
Electronic devices employing the SAW normally utilize one or more
interdigital transducers (IDTs) to convert acoustic wave to electrical signal and vice versa utilizing the piezoelectric effect of certain materials (
quartz,
lithium niobate,
lithium tantalate,
lanthanum gallium silicate, etc). These devices are fabricated utilizing
photolithography, the process used in the manufacture of silicon
integrated circuits.
SAW filters are often used in the
mobile telephones and provide significant advantages in performance, cost, and size over other filter technologies such as
quartz crystals (bulk wave),
LC filters, and
waveguide filters.
Significant research has been done in the last 20 years in the area of surface acoustic wave
sensors. Sensor applications include all areas of sensing (such as chemical, optical, thermal,
pressure,
acceleration,
torque and biological). SAW sensors have seen limited commercial success to date but are commonly commercially available for some applications such as
touchscreen displays.
In
seismology surface acoustic waves travelling along the Earth's surface play an important role, since they can be the most destructive type of
seismic wave produced by
earthquakes.
Further Information
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