How do I find the equivalent two-way beam angle Ψ for my echo sounder?Follow
The Equivalent TWBA is frequency and transducer-specific, and the value can be calculated (in Steradians) for the circular transducer through the following equation (when ka>10):
or in dB format:
Where k is the wave number [k=2π/λ] and λ is the wavelength (m), and a is the active radius of the transducer.
The calculated Equivalent two-way beam angle for each instrument with monochromatic setup is given in the table below:
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