Near Field
 |
Beam Spread
Half Angle
 |
Decibel (dB)
Gain or Loss
 |
Where:
N=Near
Field
D=Transducer
Diameter
λ=Wavelength
V=Velocity
|
Where:
λ=Wavelength
D=Transducer
Diameter
V=Velocity
F=Frequency
|
Where:
dB=Decibel
A1=Amplitude
1
A2=Amplitude
2
|
Longitudinal Wave Velocity
 |
Shear Wave Velocity
 |
Wavelength
 |
Where:
VL=Longitudinal
Wave Velocity
E=Modulus
of Elasticity
ρ=Density
μ=Poisson’s
Ratio
|
Where:
Vs=Shear
Wave Velocity
E=Modulus
of Elasticity
ρ=Density
μ=Poisson’s
Ratio
G=Shear
Modulus
|
Where:
λ=Wavelength
V=Velocity
F=Frequency
|
Refraction
(Snellʼs Law)
 |
Acoustic Impedance
 |
Reflection Coefficient
 |
Where:
θΙ=Angle of the
Incident Wave
θR=Angle of the Reflect-ed Wave V1=Velocity of Incident Wave V2=Velocity of Reflected Wave |
Where:
Z=Acoustic
Impedance
ρ=Density
V=Velocity
|
Where:
R=Reflection
Coefficient
Z1=Acoustic
Impedance of Medium1
Z2=Acoustic
Impedance of
Medium 2
|
