Maritiem Digitaal
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Sonarboei / Signal Underwater Sound Mk-84 mod 1
| titel | Sonarboei / Signal Underwater Sound Mk-84 mod 1 |
|---|---|
| inventarisnummer | MLD/0064 |
| collectie | Historische Verzameling Marineluchtvaartdienst |
| museum | Marinemuseum Den Helder
 |
| maker | Sparton Electronics |
| datum | 1994 |
| omschrijving | Cilindervormige blauwe sonarboei / Signal underwater sound (SUS), verzwaard aan de onderzijde. In het midden een tekstrand: Signal underwater sound Mk-84 mod 1. FSCM 7A529. Sparton Electronics. contact no. 646/94/1139/01 1994". Met daaronder de tekst Transducer. A sonobuoy is a device used to detect and identify moving underwater objects. Typically, a sonobuoy is used to detect submarines by either listening for the sounds produced by propellers and machinery (passive detection) or by bouncing a sonar "ping" off the surface of the submarine (active detection). Active sonobuoy: Target detection becomes difficult against a very quiet submarine, a submarine in attack mode, or in extreme environmental conditions. In these situations, it is critical to localize the target quickly and accurately. This is when active sonobuoys are used. The released acoustic energy ("ping") from an active sonobuoy and the resultant return signal enable an accurate fix on the submarine in both range and bearing. When two or more fixes are obtained, the velocity and the course of the submarine can be established. The 'A' size sonobuoys can be air-launched from fixed or rotary-wing aircraft, since they all employ a parachute to retard their descent and provide descent stability. The buoys are also easily deployable from the deck of a surface vessel. Descent of the sonobuoy is stabilized and slowed by a parachute. They also all employ a seawater battery (silver chloride), which is energized upon entry into salt water. As with the passive buoys, once energized, a mechanism for inflating a float with CO2 gas is activated, suspending the sonobuoy. The sensors are then released to specified depths. These buoys use a transducer to introduce acoustic energy into the water ("ping") and use the transducer to receive the return echoes, which are then amplified and frequency modulated for VHF transmission. Generally, these buoys are designed for deeper depths than the passive buoys. All of the buoys scuttle after a preset length of operation. The Sparton Signal Underwater Sound (SUS) device is used primarily for one-way acoustic communication with submarines. The device can be set to generate one of five distinct, coded sequences. Four of these sequences consist of a continuous tone that alternates in frequency in accordance with the timing sequence defined in the Code Table (see specifications). The fifth sequence is a continuous tone at a single frequency. |
| afmetingen | hoogte 38 cm diameter 7.5 cm |
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