Accession Number : AD0011451


Title :   THE USE OF THE MK 6 ACOUSTIC SYSTEM (AUDIO RECEPTION SYSTEM M-21) FOR SOUND RANGING


Descriptive Note : Technical rept. no. 9


Corporate Author : YALE UNIV NEW HAVEN CT LAB OF MARINE PHYSICS


Personal Author(s) : WARING, ROBERT K


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/011451.pdf


Report Date : 12 Aug 1952


Pagination or Media Count : 13


Abstract : Ranging experiments were conducted using blasting caps as sound sources and a straight-line array of 4 hydrophones of an Mk 6 acoustic system installation. Modifications of the Mk 6 system included the addition of a filter section to the power supply to reduce the hum level and the substitution of a 125 mm/sec pen recorder and 4 separate amplifier channels for the original audio amplifier and recording system. An integrating device with a time constant of 0. 01 sec was inserted immediately after the attenuators on the shore-based equipment; this circuit provided an envelope of frequencies above 100 cps. The hydrophones were spaced 500 to 1000 yd apart. The tests demonstrated that passive sound ranging is entirely practicable and that precise location of the sound source is possible. Precision was limited by the location of the hydrophone. Triangular arrays were recommended to aid in plotting and to improve accuracy. An electronic time-measuring device based upon digital computing techniques was suggested to provide automatic surveillance.


Descriptors :   *SOUND RANGING , AUDIO AMPLIFIERS , ARRAYS , PASSIVE SYSTEMS , ACCURACY , PRECISION , POWER SUPPLIES , RECORDING SYSTEMS , FILTERS , HYDROPHONES , RANGE FINDING , SURVEILLANCE , AUTOMATIC , CHANNELS , PLOTTING , ENVELOPE(SPACE) , DIGITAL COMPUTERS , AMPLIFIERS , SHORES , ATTENUATORS , DETONATORS , SOUND GENERATORS , PENETRATION AIDS , FREQUENCY , POSITION(LOCATION)


Subject Categories : Acoustic Detection and Detectors


Distribution Statement : APPROVED FOR PUBLIC RELEASE