What is the trade-off when increasing the Q factor of a transducer?

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Prepare for the Ultrasound Transducers Test with flashcards and multiple-choice questions. Each question includes hints and explanations to help you pass with confidence.

Multiple Choice

What is the trade-off when increasing the Q factor of a transducer?

Explanation:
Increasing the Q factor makes the transducer more underdamped, so it stores energy longer and rings after excitation. That lengthens the pulse duration in the time domain. At the same time, a higher Q sharpens the resonance, concentrating energy near the center frequency and reducing how much energy spreads across frequencies, which narrows the bandwidth. So the trade-off is a longer, more reverberant pulse paired with a tighter, narrower frequency band. If you need shorter pulses or wider bandwidth, you’d use a lower Q.

Increasing the Q factor makes the transducer more underdamped, so it stores energy longer and rings after excitation. That lengthens the pulse duration in the time domain. At the same time, a higher Q sharpens the resonance, concentrating energy near the center frequency and reducing how much energy spreads across frequencies, which narrows the bandwidth. So the trade-off is a longer, more reverberant pulse paired with a tighter, narrower frequency band. If you need shorter pulses or wider bandwidth, you’d use a lower Q.

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