One of our specialties: making large, complex shaped, thick-walled composite sonar domes in a single production run.
In 1999 Holland Composites developed a new technique to produce sonar domes – the protruding spherical part under the predestination of large (war) ships/ frigates, in which the sonar is housed. Until that time, sonar domes were either made of metal, or glued from several (composite) parts.
To search under water, sonar technology is used. There are two types: active sonar and passive sonar. An active sonar emits a sound: if the sound collides with an object, it bounces back. With this data you can determine that something is present and about where. A passive sonar emits nothing, but only listens to ships or submarines making noise.
Warships like frigates usually use active sonars, because they make too much noise themselves (hull, machinery and propellers) to use the passive sonar properly. So the underwater world is a world of sound: the one who is quietest and/or can hear the farthest, wins.