REPORT DOCUMENTATION PAGE 



Public reporting burden lor this collection ol Inlormallon b eallmaled to average 1 hour per response, Including the lime (or reviewing instructions, searching existing data s 

 gathering and mainlaining the data needed, and completing and reviewing the collection ot information. Send comments regarding this burden estimate or any other aspect ot Ihis 

 collection inlonnation. Including suggestions lor reducing this burden, to Washington Headquarters Services, Directorate (or Intomiatlon and Reports, 1215 Jefterson Davis Highway, 

 Suite 120A, Arlington. VA 22202-002, and to the Office ol Management and Budget. Paperworli Reduction Project (0704-0188), Washington, DC 20503. 



1. AGENCY USE ONLY (^l.eavsb/an«c; 



2. REPORT DATE 



May 1993 



4. TITLE AND SUBTITLE 



DIVER-OPERATED BURIED PIPE AND CHAIN 

 LOCATOR 



6. AUTNOR(S) 



H. Thomson 



X REPORT TYPE AND DATES COVERED 



Final: FY83 through FY92 



5. FUNOINQ NUMBERS 



PR 

 WU 



Y1606-SL-01-001-A600 

 DN387346 



7. PERFORMINQ OROANIZATION NAME(S) AND ADORESSE(S) 



Naval Civil Engineering Laboratory 



560 Laboratory Drive 



Port Hueneme. CA 93043-4328 



TN - 1858 



9. SPONSORINOMONITORINa AGENCY NAME(S) AND ADDRESSE|S) 



Naval Facilities Engineering Command 

 Alexandria. VA 22332 



11. SUPPLEMENTARY NOTES 



12a. DISTRIBUT10N/AVAILABIUTY STATEMENT 



Distribution limited to U.S. Government agencies and their 

 contractors; Research & Development, May 1993. Other requests 

 for this document shall be referred to NCEL. 



12b. DISTRIBUTION CODE 



13. ABSTRACT ^Maximum 200 worts; 



A prototype system has been developed for use by the Navy Underwater Construction Teams (UCTs) in locating 

 submerged ferrous objects (such as pipelines and mooring chain). The system consists of a commercially available 

 magnetometer modified to meet the UCT mission requirements. The magnetometer, a fluxgate sensor built for 

 terrestrial use, is manufactured by Forster Instruments, Incorporated. The sensor was modified to be used underwater 

 by divers, or dipped (slow towed) from a small inflatable boat. This report documents the development of this 

 prototype tool, called the Diver-Operated Buried Pipe and Chain Locator. 



W1BL/WH0I.. 



0301 00671SS M 



14. SUBJECT TERMS 



Magnetometer, fluxgate, pulse induced 



15. NUMBER OF PAGES 



60 



16. PRICE CODE 



Unclassified 



Unclassified 



Unclassified 



NSN 7540-01-280-5500 



20. UMITAT10N OF ABSTRACT 



UL 



standard Form 298 (Rev. 2-89) 

 Prescribed by ANSI Sid. 239-18 

 298-102 



