Indian Journal of Geo Marine Sciences Vol. 47 (09), September 2018, pp. 1723-1726 Technical Note SONO BOUYS Raja Acharya India Meteorological Department,Regional Meteorological Centre,Kolkata,Ministry of Earth Sciences 4, Duel Avenue,Alipore Kolkata-700027 [E.Mail:
[email protected] ] Received: 14 May 2018 Revised 20 July 2018 A bouy is an anchored floating device which serves as (http://navyaviation.tpub.com/14030/css/Sonobuoy a navigation mark, to show reefs or other hazards, or -Receivers-107.htm) for mooring. A Sono Bouy is a buoy equipped to Sono buoys are classified into three categories: detect underwater sounds, objects and transmit them active, passive and special purpose. by radio. It is a relatively small buoy (typically 13 cm Active sono buoy uses a transducer to radiate a or 5 in, in diameter and 91 cm or 3 ft long with sonar pulse that is reflected back from the target. The expendable sonar system that is dropped/ejected from time interval between the ping (sound pulse) and the aircraft or ships conducting anti-submarine warfare or echo return to the sono buoy is measured. Taking the underwater acoustic research. Doppler Effect on the pulse frequency into The sono buoy has 4 main components: a float, a consideration, this time-measurement data is used to radio transmitter, a saltwater battery, and a calculate both range and speed of the submarine hydrophone. Hydrophone is an underwater sensor relative to the sono buoy. The command activated that converts the pressure waves from underwater buoy is controlled by a UHF command signal from sounds into electrical voltages that get amplified and the aircraft.