Using a hydrophone you can measure which of the following?

Using a hydrophone you can measure which of the following?

• A. Impedance
• B. Pressure amplitude
• C. Duty factor
• D. Pulse repetition frequency

Answer: (B)

Hydrophones detect acoustic pressure changes in water and convert those pressure fluctuations into an electrical signal. The quantity they reveal most directly is the pressure amplitude—the peak pressure variation from ambient to the wave’s extreme. This is why pressure amplitude is the best answer. Acoustic impedance, on the other hand, is a relationship between pressure and particle velocity and isn’t directly measured by a hydrophone. Duty factor and pulse repetition frequency describe timing properties of a pulse train; they’re determined from how long the signal is on versus off or how often pulses occur, not from the hydrophone’s basic pressure sensing.

Hydrophones detect acoustic pressure changes in water and convert those pressure fluctuations into an electrical signal. The quantity they reveal most directly is the pressure amplitude—the peak pressure variation from ambient to the wave’s extreme. This is why pressure amplitude is the best answer. Acoustic impedance, on the other hand, is a relationship between pressure and particle velocity and isn’t directly measured by a hydrophone. Duty factor and pulse repetition frequency describe timing properties of a pulse train; they’re determined from how long the signal is on versus off or how often pulses occur, not from the hydrophone’s basic pressure sensing.