E. SUBSUREX (SUBSURFACE EXPLORER) (cont'd) 



5. Maximum penetration of sediment: 



Empirically determined: 1,500 feet 

 Estimated: Several thousand feet 



6. Transducers: 



Type: Transmitter: magnetostrictive; Receiver: crystal 

 Location: Outboard 



7. Acoustic power: About 5 x 10 watts (calculated from a measured 



value of 137.5 db/dyne/cmr at 1 meter) 



8. Acoustic frequency: 



Approximate range: 0.1 to about 14 kilocycles 

 Peak: 10 and 14 kilocycles 



9. Acoustic pulse length: 0.1 to 10 milliseconds 



10. Acoustic pulse repetition rate: Variable (1 pulse per second 



in the literature) 



11. Receiver band pass filter network: Adjustable 



High pass: 20 c.p.s. 

 Low pass: 20 kilocycles 



12. Graphic record; 



Scale: to 1,000, 9,000, 15,000, and 45,000 feet 



Paper type: Chemically treated 



Paper dynamic range: Probably about 20 db 



13. Net weight: 1,600 pounds 



14. Relay rack (19 inches wide) panel space: 120 inches (two 60-inch 



panels) 



15. A.C. power consumption: 5 kilo volt- amperes 



16. Evaluation and recommendations: 



a. Equipment has not been used for routine surveys. 



b. Sediment penetration statements may be liberal. 



17. References: X-26 



D-9 



