A. SUBSTRATA ACOUSTIC PROBE (MARINE SONOPROBE) (cont'd) 



6. Transducers: 



Type: Transmitter: magnetostrictive; Receiver: bariumtitan- 



ate 

 Location: Hull-mounted (USNHO, NEE) or outboard (Magnolia) 



7. Acoustic power: 1.2 to 1.5 x 10 watts (estimated), assuming an 



electrical to acoustic conversion efficiency of 25 percent to 

 30 percent. (The acoustic power of the NEL Sonoprobe was 

 measured to be 10^ watts, which the manufacturer believes 

 to be below normal: D. G. Moore, written communication.) 



8. Acoustic frequency: 



Approximate range: 1.5 to 9.8 kilocycles 

 Peak: 3.8 kilocycles 



9. Acoustic pulse length: 0.3 millisecond 



10. Acoustic pulse repetition rate: 12 pulses per second 



11. Receiver band pass filter network: Adjustable 



High pass: 1.1 kilocycles 

 Low pass: 9.8 kilocycles 



12. Graphic record: 



Scale: to 100 and 100 to 200 feet (USNHO); to 200 and 200 



to 400 feet (NEL and Magnolia) 

 Paper type: Dry, electrosensitive (Teledeltos L-48) 

 Paper dynamic range: About 2.5 db 



13. Net weight: 687 pounds 



14. Relay rack (19 inches wide) panel space: 65 inches 



15. A. C. power consumption: 1,500 watts 



16. Evaluation and recommendations: 



a. Equipment has been used successfully for routine surveys. 



b. Equipment provides high resolution but low penetration. 



c. Equipment is recommended for high resolution studies in 



shallow water where deep penetration is unnecessary. 



17. References: X-18, -19, -20, -23, and -24 



D-2 



