WAVES AND VIBRATIONS IN INHOMOGENEOUS STRUCTURES ...

Reflectance, R
1.0
0.8
0.6
0.4
0.2
a
ARTICLE IN PRESS
0.0
0 200 400 600 800 1000 1200 1400 1600
Frequency [Hz]
Fig. 3. (a) One-dimensional periodic structure (Bragg grating) with three inclusions of scatter 1 (black) in the host ground material (white);
(b) the corresponding reflected power R for P and S waves. P wave (solid line), S wave (dashed line).
b
Reflectance, R
1.0
0.8
0.6
0.4
0.2
0.0
J.S. Jensen / Journal of Sound and Vibration 301 (2007) 319–340 329
a
0 200 400 600 800 1000 1200 1400 1600
Frequency [Hz]
Fig. 4. (a) Two-dimensional triangular periodic structure with three rows of scatter 1 inclusions (black) in the host ground material
(white); (b) the corresponding reflected power R for P and S waves. P wave (solid line), S wave (dashed line).