226 
Lecture 12 
100 
10 
| 
es 
«< 
SS 0. 
kr 
N 
Ol 
0.0015; | ile) 100 
L/k?R? 
Fig. 12.16, Scattering as a function of frequency [51]. 
With the abbreviation 
4L 
D ~kR? 
the mean-square scattered pressure becomes 
2 
<pse> 2 
ie . =F - b)= fF <a?> k? RL =f tan ‘D) (64) 
This solution is represented in Fig. 12.16. For large values of range, this so- 
lution passes over in the wave-theory expression for interference scattering. 
12.4.3. Continuous Patch Distribution 
In the general cases, the patches of inhomogeneity are not adequately rep- 
resented by a simple Gaussian correlation function. The two experimental 
Gaussian terms yield a poor representation of the experimental results. It then 
becomes expedient to replace the correlation function by the power spectrum 
