READ WAVEFORM <#9> FROM 7854 



SD5199 



= 



8 



100HV 



MEAN 



= 



1 



448tiv 



PK-PK 



= 







390nv 



SD(?299 



= 







527nv 



MEAN 



= 



1 



323nv 



PK-PK 



= 



3 



662nv 



SD<?390 



= 



4 



470nv 



MEAN 



= 



1 



345nv 



PK-PK 



= 



39 



615mv 



SD<?400 



= 



4 



200nv 



MEAN 



= 



1 



291nv 



PK-PK 



= 



30 



615nv 



0.98 0.20 0.40 9.69 0.80 1.00 1.20 1.40 1.60 1.80 2.00 



1.0E-3 S 512 p/u 



Press return to continue 



(a) Through seawater. 



READ HAUEFORM <*0> FROM 7854 



sDeiee 



. 







308*v 



MEAN 



m 



1 



052nv 



PK-PK 



m 



1 



270nv 



SDS209 



m 







612nv 



MEAN 



m 



1 



879nv 



PK-PK 



m 



2 



832nv 



SD@309 



■ 



1 



144nv 



MEAN 



■ 



1 



930tiv 



PK-PK 



» 



8 



098nv 



SDP490 



= 



1 



946nv 



MEAN 



= 







987nv 



PK-PK 



= 



10 



498nv 



"1" indicates the portion that 

 traveled through wood which 

 arrives first. 



"2" indicates the portion that 

 traveled through water which 

 arrives later. 



9.98 9.29 9.49 9.69 9.88 1.90 1.28 1.49 1.68 1.88 2.88 



1.0E-3 S 512 p/w 



Press return to continue 



(b) Through wood. 

 Figure 11. Received ultrasonic signals. 



24 



