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