# Shared Flashcard Set

## Details

US Physics (Edelman)
Chapter 10 Sound Beams
19
Physics
Professional
07/19/2011

## Cards Return to Set Details

Term
 Near Zone
Definition
 Freznel ZoneThe region or zone in between the transducer and the focus
Term
 Far Zone
Definition
 Fraunhofer ZoneThe region or zone deeper than the focus, beyond the near field.
Term
 Sound beams do this is the near field
Definition
 converge
Term
 Sound beams do this in the far field
Definition
 diverge
Term
 The focal depth is
Definition
 The distance from the transducer face to the focus also called focal length or NZL
Term
 The focus or focal point is
Definition
 the location where the beam reaches its minimum diameter.
Term
 The focal zone is
Definition
 The region surrounding the focus where the beam is sort of narrow and the image is relatively good
Term
 For an unfocused continuous wave disc transducer at the end of the near zone the beam diameter is
Definition
 1/2 the transducer diameter or aperture
Term
 At two near zone lengths, the beam diameter is
Definition
 equal to the transducer diameter
Term
 Focal depth
Definition
 distance from the transducer to the focal point
Term
 Focal depth is determined by
Definition
 transducer diameter and frequency
Term
 Sound beam divergence is
Definition
 the spread of the sound beam in the deep far zone
Term
 Sound beam divergence is determined by
Definition
 transducer diameter and frequency
Term
 Diffraction pattern is shaped like
Definition
 a V also called a Huygens wavelet
Term
 Huygens Principle explains
Definition
 the hourglass shape of an imaging transducers sound beam
Term
 Huygens Principle says that
Definition
 each tiny part of the surface of the transducer face may be considered and individual sound source
Term
 Frequency (CW) is determined by
Definition
 Electronic frequency
Term
 Frequency (pulsed) is determined by
Definition
 Thickness of ceramic and speed of sound in ceramic
Term
 Focal length and divergence are both determined by
Definition
 diameter of ceramic and frequency of sound
Supporting users have an ad free experience!