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Fiber optic Hydrophones

China

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Company that develops linear and planar hydrophone arrays. The arrays are designed to be applicable in passive SONAR for listening, monitoring and direction-finding.
SONAR (SOund Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels and submarines. Two types of technology share the name "sonar": passive sonar is essentially listening for the sound made by vessels; active sonar is emitting pulses of sounds and listening for echoes. The Sensing procedure in Sonar System usually is done by Hydrophones.
A hydrophone is a microphone designed to be used underwater for recording or listening to underwater sounds. Most hydrophones are based on a piezoelectric transducer that generates electricity when subjected to a pressure change. Such piezoelectric materials, or transducers, can convert a sound signal into an electrical signal since sound is a pressure wave. The new Technology of making Hydrophone is Acousto-Optic Transducer that made by Fiber Optic Sensing Technology.
Fiber optic Hydrophones is one major type of hydrophones that are of great importance to underwater and naval acoustics. The chief advantage is that problems related to the integration of traditional underwater acoustic sensing and sonar data transmission can be resolved from an entirely new perspective, thus improving the reliability and possibly decreasing the total cost of manufacture, operation and maintenance of the sonar system.
Because of its inherent directivity and unique phase processing, the Fiber Optic (FO) hydrophone possesses potential advantages in the detection of quiet underwater acoustic targets emitting low frequency and ultra-low frequency noise. Engineering applications for FO hydrophone have gradually emerged from the research laboratory, and will play an active role in the development of future sonar systems. A brief overview of the two technology (Piezoelectric and Fiber Optic) is presented from the viewpoint of sonar design, including the basic physics, principle of operation, key techniques, and applications.
Comparison between Piezo-Electric and Fiber Optic Sensors
Parameter Piezoelectric Acoustic Sensor Fiber Optic Acoustic Sensor
Transducer Type Piezo-electric Transducer Opto-mechanical Transducer
Needing Electrical power at sensor point Sensors and Pre-amplifier are driven by electric power Sensors are not driven by electric, It works by laser light
Sensor Output Electrical Signal Optical Signal
Need post Electronic Processor at Sensor Point Need Not Need
Long Range data transferring method Convert Electrical Signal to Optical Signal By Optical Modem then transfer on long fiber Optic Cable transfer on long fiber Optic Cable
Multiplexing Methods for Array All Hydrophones are independent. So there are many problems in multiplexing Multiplexing is possible
Maximum Cable length 100~200 Km, with repeater device in fiber cable 25 Km. Repeater device using in this method is impossible
Array weight & size Big size and heavy weight Small size and lightweight
Minimum Acoustic Frequency Detection >500 Hz >50 Hz
 
In our company a sonar array system, based on fiber optic sensors, has been realized to estimate the direction of the underwater acoustic sources. The system is composed of one system with 24 fiber optic sensors.

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联系人: sara

公司名称:super emission technology (rayemit)

办公地址:Jinhua, Zhejiang, China,

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