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Echo menu Hoofdstuk 5-11
5.9 Transducer bundelbreedte
De in de romp van uw schip gemonteerde transducer fungeert tijdens het
zenden als “luidspreker” en bij de ontvangst door de dieptemeter als “micro-
foon. Vergelijkbaar met de wijze waarop een zaklantaarn het licht bundelt,
wordt de meeste geluidsenergie omlaag gericht maar een klein gedeelte zal
naar opzij gericht zijn. De mate waarin de geluidsbundel zijdelings uitwaaiert
wordt aangeduid met ‘bundelbreedte.
Transducer
Benadering van het geluids-
patroon onder de transducer
Deze hoek komt overeen met de
bundelbreedte van de transducer
1/2 maximum intensiteit
Maximum intensiteit
Fig. 3 Schets van de transducer bundelbreedte.
De concentratie van energie is het grootst in het centrum van de geluidsbundel
waarbij zich aan weerszijden van dit centrum een lijn bevindt waarlangs de
intensiteit van het geluid nog maar de helft bedraagt van het niveau in het cen-
trum. De hoek tussen deze twee lijnen wordt aangeduid met “bundelbreedte”.
Zie Fig. 3.
95


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