Table 3 



Calculated Detection Ranges for Plalform FP-2 



Platform Data: Fixed, production, three legs - 16 ft diameter. 



Prime power - gas turbine, water depth - 75 feet 



Source Level (1/3 Octave Band at 1 Yard) 



142 dS re 1 micropascal 



134 



128 



124 



125 



110 



Case I: Optimal Propagation (Cylindrical S preading) 



Animal Listening Assumption 



Frequency 



20 



Hz 



63 



Hz 



125 



Hz 



250 



Hz 



500 



Hz 



1600 



Hz 



A. Good Detection B. Conservative Detection 

 (1/3 octave crit. band) (100 Hz crit. band) 



Ambient Noise Condition Frequency Detection Range Frequency Detection Range 



1. 



High 



Ambient 



20 



Hz 



120 



Kyd 



59 



nm 



20 



Hz 



5 



Kyd 



2, 



.50 



nm 



2. 



Medium Ambient 



20 



Hz 



1000 



Kyd 



490 



nm 



20 



Hz 



35 



Kyd 



17, 



.00 



nm 



3. 



Low 



Ambient 



20 



Hz 



6000 



Kyd 



2960 



nm 



20 



Hz 



300 



Kyd 



148, 



,00 



nm 



Case II: Conservative Propagation (Spherical Spreading) 



Animal Listening Assumption 



A. Good Detection B. Conservative Detection 

 (1/3 octave crit. band) (100 Hz crit. band) 



Ambient Noise Condition Frequency Detection Range Frequency Detection Range 



1. High Ambient 20 Hz 350 yds 0.17 nrn 20 Hz 70 yds 0.02 nm 



2. Medium Ambient 20 Hz 1000 yds 0.49 nm 20 Hz 200 yds 0.05 nm 



3. Low Ambient 20 Hz 3000 yds 1.50 nm 20 Hz 600 yds 0.12 nm 



G-43 



