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Active Sonar Equation

Active Sonar Equation. Adapting Passive Ideas. Passive Case:. From our Sonar. Target Strength describes the fraction of energy reflecting back from the target. Reverberation Noise. Reflections from non-target objects is greater that noise. Reverberation limited. Active Sonar – Materials.

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Active Sonar Equation

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  1. Active Sonar Equation

  2. Adapting Passive Ideas Passive Case: From our Sonar Target Strength describes the fraction of energy reflecting back from the target

  3. Reverberation Noise Reflections from non-target objects is greater that noise. Reverberation limited

  4. Active Sonar – Materials • Typical piezoelectric materials • Quartz • PZT -Lead zirconate titanate • Barium Titanate

  5. a+Da Piezoelectricity a

  6. Source Level for an Omni-directional projector

  7. Electrical Efficiency Efficiency may range from 20% to 70% for most sonar applications

  8. Directional Arrays Principle of Reciprocity

  9. Transducer Sensitivity How many dB for 1 volt input? Input impedance Manufacturers typically advertise based on SV. To find SL, add 20logV.

  10. Example • Compute the source level for an circular piston projector of diameter = 1 meter radiating 10 kW acoustic power at a frequency of 15 kHz in water Piston array:

  11. Cavitation (z in meters) Pressure Threshold S = Tranducer Surface Area Power Threshold

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