How is the duty factor defined?

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Multiple Choice

How is the duty factor defined?

Explanation:
Duty factor describes the fraction of time the transducer is actively emitting during each ultrasound cycle. It is defined as the transmit-on time divided by the total time of one cycle, where the transmit-on time is the pulse duration and the total time is the pulse duration plus the off-time between pulses. This makes DF a dimensionless number between 0 and 1; continuous emission has DF = 1, while short pulses with long gaps have a much smaller DF. The other expressions don’t capture this timing ratio: using received signal duration isn’t about the emitted duty cycle, and multiplying times wouldn’t produce the needed dimensionless ratio.

Duty factor describes the fraction of time the transducer is actively emitting during each ultrasound cycle. It is defined as the transmit-on time divided by the total time of one cycle, where the transmit-on time is the pulse duration and the total time is the pulse duration plus the off-time between pulses. This makes DF a dimensionless number between 0 and 1; continuous emission has DF = 1, while short pulses with long gaps have a much smaller DF. The other expressions don’t capture this timing ratio: using received signal duration isn’t about the emitted duty cycle, and multiplying times wouldn’t produce the needed dimensionless ratio.

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