PLOTRTH produces plots of the plane wave reflection coefficient as a function of angle ( R(THETA) ). Reflection loss defined as -20 log10 ( R ) may also be plotted. An Internal Reflection Coefficient file computed by BOUNCE provides the input.
Files:
Name Unit Description
Input
*.PLP 1 PLot Parameters
*.IRC 10 Internal Refl. Coef.
Output
*.PRT 6 PRinT file
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EXAMPLE AND DESCRIPTION OF PLP FILE:
'D', ! 'L/D' linear or dB scale
1500.0, ! C0
0.0 90.0 10.0 / ! THMIN, THMAX, THINC, THAXL (cm)
0.0 15.0 5.0 / ! RMIN, RMAX, RINC, RAXL (cm)
(1) - OPTIONS
Syntax:
OPTION
Description:
OPTION(1:1): Reflection coef. or reflection loss.
'L' Linear scale
(reflection coef.)
'D' dB
(reflection loss.)
(2) - Reference wave speed
Syntax:
C0
Description:
C0: Sound speed in the halfspace.
The reflection coefficient depends on the sound speed
and density of the medium from which the wave is incident.
The density is assumed unity.
(3) - ANGLE AXIS INFO
Syntax:
THMIN THMAX NTH THINC THAXL
Description:
THMIN: First angle (degrees).
THMAX: Last angle (degrees).
THINC: Angular interval for tick marks (degrees).
THAXL: Angle axis length (cm).
(4) - REFLECTION LOSS AXIS INFO
Syntax:
RMIN RMAX RINC RAXL
Description:
RMIN: R minimum (dB).
RMAX: R maximum (dB).
RINC: R interval for tick marks (dB).
RAXL: R axis length (cm).
If you set RMIN=RMAX then the curve is autoscaled.
Figure: Sample output of PLOTRTH.