What term describes the time duration of the transmitted ultrasonic pulse?

• A. The pulse length
• B. The pulse amplitude
• C. The pulse shape
• D. The pulse duration

Answer: (A)

In ultrasonics, the time duration of the transmitted burst is described by the pulse duration. It tells you how long the transducer is actually emitting energy, measured in units of time (typically microseconds). This is the temporal length of the pulse.

Pulse length, on the other hand, refers to the physical length of the pulse in the material. It is the distance the pulse occupies and is found by multiplying the pulse duration by the speed of sound in the medium, giving a measurement in meters. So when you’re talking about how long the pulse lasts in time, you’re describing the pulse duration; when you’re talking about how long the pulse appears in space, you’re describing the pulse length.

The other terms: pulse shape describes the form of the waveform (for example, Gaussian or rectangular), and pulse amplitude describes how strong the signal is (its peak pressure or voltage).