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FISH 4350 y FISH 4380 Manual de Instalação e Operações74
NAVMAN
Profundidade 200 kHz
15°
50
100
150
200
250
0
13
27
40
54
67
Tipos de fundo
Fundos com lama, algas marinhas e areia ten-
dem a enfraquecer e espalhar o pulso de sonar,
resultando em um eco fraco. Fundos com rocha
ou coral reß ectem o pulso, resultando em um
eco forte. Consulte a secção 5-3 Visor de fundo
do sonar.
Frequência e largura do cone
O pulso gerado pelo transdutor do FISH 4350 e
do FISH 4380 percorre a água para baixo, es-
palhando-se para fora, na forma aproximada de
um cone. Dentro do cone, os sinais de retorno
são mais fortes. O tamanho do cone depende
do projecto do transdutor e da frequência do
pulso: com a montagem da Navman no painel
de popa, ele é de cerca de 15°. A Þ gura mostra
como a largura do cone varia em função da
profundidade, para cada frequência utilizada.
As Þ guras são aproximadas..
Sombras
As sombras são criadas em volta de áreas que o feixe ultra-sónico não pode ‘ver’. Essas áreas
incluem depressões no fundo ou ocultas por rochas e saliências, em que os fortes ecos retornados
das rochas obscurecem os ecos débeis de peixes e também podem criar um traçado de fundo
duplicado. Consulte abaixo um exemplo de exibição de sonar em tal ambiente. Na exibição, é
mostrado um traçado de fundo duplicado.
O sonar exibe a mesma área
na exibição são visíveis peixes
os peixes Þ cam ocultos pelos fortes ecos
do fundo e não são mostrados no visor
Exemplo de sombras
na exibição são visíveis peixes
17


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Others manual(s) of Navman FISH 4380

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