Cours sur les méthodes d'évaluation acoustique ... - Fao - Copemed

120 kHz Split-beamtransducerTRANSDUCERSimrad ES 18IntroductionThe ES 120-7 is a split-beam transducer with76 piezo-ceramic elements arranged in four quadrants.The following specifications are valid whenall four quadrants are connected in parallel.Order numberKSV-088277(855-130262 Rev.C)Technical specificationscationsResonant frequency....................................... 120 kHzBeamwidth, circular .....................................7 deg ±1Directivity: D ...........................................................650 ±20% DI=10logD.............................................28 ±1 dBEquivalent two-way beam angle:Ψ.......................................0.009 ± 20% steradain10 logΨ.............................................. -20.5 ±1 dBSide lobes ..........................................less than -15 dBBack radiation ...................................less than -35 dBAngle sensitivity:Phase angle/angle to target ................................21Impedance: Nominal ...................................................15 ohms Max. variation in |Z| ......................... 11 -20 ohmsMax variation in phase angle .........................±30 degTransmitting response .............................185.5 dB ±2re 1Pa per V0Receiving sensitivity, open circuit ........ -186.5 dB ±2re 1V per PaElectroacoustic efficiency ......................... 0.70 ±0.20Maximum pulse power input ......................... 1000 WMaximum continous power input ...................... 10 WMaximum transducer depth ............................. 150 mCable length ....................................................... 20 mCable diameter ................................................ 18 mmWeight without cable ..........................................5 kgStorage temperature ................................ -20 to 70°CManufacturerSimrad ASStrandpromenaden 50P.O. BOX 111N3191 Hortenwww.simrad.com