Gallagher 



Table 5 



MEASURED AND SUTTON DERIVED SOUND VELOCITIES AND CORRESPONDING 

 IMPEDANCE DATA — CORE NO. 5 — TOTO 



and in the number and thicknesses of the layers were effected by the small 

 sound velocity differences. The peak amplitude reflection coefficients for both 

 the measured and Sutton derived values 

 over a wide range of incident angles g 

 are shown In Fig. 6. 



0-8|- 

 u 



Differences In the measured and § 

 Sutton derived sound velocity values 5 

 are again large In core no. 6, as shown ^4. 

 in Table 6. The resulting differences | 

 In the respective impedance profiles I' 

 are shown In Fig. 7. These moderate ^1 



UJ 



differences in the sound velocity data 

 produced changes in the number and 

 thicknesses of impedance layers and 

 in the magnitudes of these layers. 



20 30 40 50 60 70 80 



ANGLE Of INCIDENCE (DEGREES) 



Fig. 6 



Reflection Coefficients versus Incident 



Angles -Core No. 5- TOTO 



The reflection coefficients for both cases in core no. 6 were computed for 

 various incident angles, and the results are shown in Fig. 8. The magnitude 



97 



