AMX系列交流电源维修

Modern influence sea mines detect the magnetic disturbance of a vessel in the Earth’s Magnetic Field, this is referred to as the vessels magnetic signature. This Signature is the most significant influences of those used to trigger to the mine.

To minimise this threat naval vessels are fitted with an on-board Degaussing System (DG). The DG reduces the signature with a counter-acting field, generated from a coil system, connected to loop-coil current amplifiers. Typical 90- 95% of the ship’s signature can be neutralised with a well designed 3-dimensional DG system.


Magnetic signature management

Polyamp have delivered over 40 DG systems, all of which are computer controlled Advanced Degaussing Systems (ADG).

Polyamp offer several types of loop-coil amplifiers for installation on different sizes of vessels. The location of the loop coil amplifiers can either be centralised in racks or distributed close to the coil. The ADG methodology improves the signature performance and the time and effort needed in ranging relative to a system with only a few large amplifiers.

Polyamp specialise in Advanced Degaussing Systems (ADG), which in general terms means that each coil is individually controlled by one loop coil amplifier (BPAU) and that the coil system is 3-dimensional. Polyamp have had digitally controlled amplifiers since beginning of 1980-ties and current version of the Degaussing Digital Control is of the third generation.

Typical degaussing equipment

Naval operational priorities have shifted from blue water to brown/shallow water. This means that the threat is increased as ships comes much closer to the influence mines. Better degaussing systems than previously used are therefore now required. The answer to this increased threat is ADG.

• Typical degaussing equipment
• Systems suitable for the smallest vessel’s to aircraft carriers
• Turnkey capability including system design, equipment supply and proving trials
• Favorable total ownership cost
• Efficient signature handling with control, evaluation and prediction
• Modular and digital open systems, upgradeable for future threats
• Cost effective procurement

A Polyamp ADG is normally controlled by one or more magnetometers to achieve a low signature. Several fallback control modes are available, including Gyro Geomagnetic map and manual, depending on the system layout.

With ADG the signature is adjusted by changing loop-coil currents. Worldwide operation can be maintained without the need to change connections at the junction boxes or to check ranging before entering the operational area.

The ADG ranging process is much faster, especially when using SWECADE^© ranging data acquisition and measurement software with coil modeling.
Remote control from the range office can be achieved, quickly and safely by simply connecting a transceiver to the DG system.

The Polyamp powerful ADG systems enables significant savings on the overall installation cost and weight to be achieved by using less and thinner degaussing coil cables. This is of significant benefit to the shipyard.

The ADG is also ideally suitable for the modern principles of sectional building of ships. The location of the Degaussing System components is very flexible and there is no need of a special dedicated operators console to run the ADG. The console function can be one of many other software applications in any suitable PC workstation onboard the vessel.

A typical block diagram of a distributed Polyamp ADG system.

Underwater Electric Potentials (UEP) are produced by cathodic currents in the ship or submarine hull and also from propeller or other metallic materials in contact with salt water. A ships electric potential signature is therefore generated in a similar way as the magnetic signature. This can also be used as an input or trigger signal in an influence mine. The ships movement also produces a Extra Low Frequency Electric field (ELFE) that can be used for positioning, target evaluating or for reconnaissance.

Polyamp have developed a range of sensors and platforms for the measurement of these electric signatures for use in:

• Upgrading conventional sea ranges
• Transportable sea ranges
• Reconnaissance, fixed or mobile equipments
• Influence sea mines

All the Polyamp sensors and platforms use a unique and patented Polyamp carbon fibre electrode sensor which is very sensitive. The mechanical robustness, handling and life expectancy of sensors using carbon fibre technology make it much more versatile for these applications compared to other electrode types.

Polyamp can supply a complete system package with electrodes, very low noise amplifiers, data acquisition, analysis, presentation and documentation with the SWECADE^© range software package.

Polyamp UEP and ELFE Systems - Key features

• Carbon Fibre Electrodes - Robust Technology
• Very Low Noise Amplifiers - High Sensitivity
• Salinity Independent - Useable for All Waters Instantaneously
• Inert Sensors - Maintenance Free Without Need for Salt Bridges
• Rapid Deployment - No Operational Delays
• High Reliability - Long Life Expectancy
• 3 Axis Platform Designs - Fixed and Transportable Ranges