Question

3. A transducer is designed which consists of a rectangular face with the dimensions shown below. The face of the transducer vibrates in and out to generate the acoustic wave. a) Estimate the distance to the far-field at 150kHz (such as might be used for side scan sonar). b) The mainlobe of this array will be approximately rectangular shaped and wider in the vertical direction than it is in the horizontal direction. If the angle to the first null is given by the same $\lambda$ formula as it was for the continuous line array, $\sin\theta = \frac{\lambda}{L}$, what is the null to null beamwidth of the mainlobe in the horizontal direction?

          3. A transducer is designed which consists of a rectangular face with the dimensions shown
below. The face of the transducer vibrates in and out to generate the acoustic wave. a) Estimate
the distance to the far-field at 150kHz (such as might be used for side scan sonar). b) The
mainlobe of this array will be approximately rectangular shaped and wider in the vertical
direction than it is in the horizontal direction. If the angle to the first null is given by the same
$\lambda$
formula as it was for the continuous line array, $\sin\theta = \frac{\lambda}{L}$, what is the null to null beamwidth of
the mainlobe in the horizontal direction?

3. A transducer is designed which consists of a rectangular face with the dimensions shown
below. The face of the transducer vibrates in and out to generate the acoustic wave. a) Estimate
the distance to the far-field at 150kHz (such as might be used for side scan sonar). b) The
mainlobe of this array will be approximately rectangular shaped and wider in the vertical
direction than it is in the horizontal direction. If the angle to the first null is given by the same
λ
formula as it was for the continuous line array, sinθ = (λ)/(L), what is the null to null beamwidth of
the mainlobe in the horizontal direction?

Added by Julio H.

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