Concept
Consilium SAL 860T Doppler speed log
| URI | http://vocab.nerc.ac.uk/collection/L22/current/TOOL1837/1/ | |
|---|---|---|
| Within Vocab | SeaVoX Device Catalogue | |
| Alternative Labels | Consilium SAL 860T | |
| Definition | The Consilium SAL 860T is a dual axis Doppler speed log operating on the principle of acoustic echo correlation. The instrument is capable of independently measuring relative, true longitudinal and transversal speed and depth. The system is redundant and can also be used as a docking system. The T denotes a new bottom tracking main unit, built on digital signal processing technology, and features a patented hydroacoustic transducer. The transducer contains one pair of piezoelectric elements oriented parallel to the longitudinal axis of the vessel to measure the component (F) of the relative speed, and five piezoelectric elements, grouped in a patented way, to measure the components of the absolute speed. All elements work both for radiation and for reception. Sound energy is emitted vertically to the ground, perpendicular to the bottom of the ship. Relative velocity (WT) is measured at 4 MHz (pulse mode). To measure the absolute speed (BT), a frequency of 150 kHz is used, sound reflection comes from the ground. The same frequency is also used to measure depth. The multi-element hydroacoustic transducer allows measuring absolute velocity vectors in 12 directions - through 30 along the entire horizon, which provides high-precision calculation components (Vx) and (V) of the ship's speed. In addition, simultaneous measurements of the absolute and relative speed of the vessel make it possible to calculate the speed of the current. This feature is implemented in the ���SAL-860��� log (���Docking Log���). The instrument is capable of measuring within the range of -8 to +30 knots and in depths from 3 to 300 metres, with speed measurement error within +/- 0.1 knots or 0.5% (whichever is greater), distance covered within +/- 0.2% and depth under the keel within +/- 1%. | |
| Date | None | |
| Identifier | TOOL1837 | |
| Note | accepted | |
| Is Version Of | TOOL1837 | |
| version | 1 | |
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