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## plotrth.hlp

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.

Michael B. Porter
Tue Oct 28 13:27:38 PST 1997