Pressure radiated by a single source
Acoustic power which is transmitted by a source to the medium is written:
where
is a real part of radiation impedance and
is an acoustic output from the source. This power is propagated step by step, "to infinity".
For a monopolar source, pressure field is written:
where
is the volume velocity of the source and
is a solid angle in which the source radiates.
(
: infinite space,
: half-space, etc).
Remarque : Remark
Equation 1 shows that:
pressure amplitude decreases with
, which leads to the existence of spherical waves,it is proportional to the acceleration as and to the surface S of the source (
),wave traveling time is
(phase
)
