Installation manual

TransducerInstallation
Example:Acousticwindow
Thetransducershowninthegurebelowismountedinsidethetankbehindastrong
acousticwindowwhichcouldbemadeofpolycarbonate.
Thetankislledwithoil.
Figure34Acousticwindow
ASteeltank
BOil
CAcoustic
window
DCableservice
loop
EStufngtube
FCableinsteel
conduit
GOilinlet
(CD017012B)
B
A
C
G
D
E
F
Transducermountedinsidethehull
Thetransducercanalsobemountedinsidethehull.
Aninstallationofthetransducerinsidethehull,andsoundingthroughthehull,requiresa
goodacousticcontactbetweenthetransducerfaceandthehull.Buildatankaroundthe
transducerandllitwithaliquid.Oilusedinhydraulicsystemsisawellsuitedliquid
forthispurpose.Itcontainsnogasbubblesandisnon-corrosive.
Typicalvaluesofthetwowaylossare3dBforpolyester,6dBforaluminiumand10dB
forsteel.Hullsmadeofwoodorasandwichtypewithfoaminthemiddle,attenuate
thesoundsomuchthatthroughhullsoundingmustberegardedasimpossible.Theloss
varieswiththedistancebetweentransducerfaceandthehull.Thebestresultisobtained
whenthedistanceishalfawavelength.ConsultSimradforadvice.Inadditiontothe
loss,thebeampatternisdegraded,becausealargerareaofthehullissetintovibrations.
Usemountingandclampingringswheneverprovided
Circulartransducersmaybeprovidedwithmountingandclampingrings,orwith
drawingstoallowforlocalproductionofthese.Themountingringisweldedtothe
holepreparedforthetransducer,whiletheclampingringtsaroundtheedgeofthe
transducerbody.Boltsthroughtheclampingringintothemountingringwillsecurethe
transducerbetweenthem.Notethatseveraltransducersusedirectionguidestoallow
correctmounting.
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