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WorksheetsBeams and Focusing
Total questions: 43
Worksheet time: 43mins
The width of a pulse as it travels away from the transducer.
(a)
The transducer produces a sound beam with a ______ that ______ according to the distance from the transducer face.
(a)
Narrowest part of the beam.
(a)
Area surrounding the focus
(a)
Focal length =
(a)
Where do you get your most optimal image in?
(a)
Near zone is also known as
(a)
Region extending from the transducer to the minimum beam width
(a)
Focus is also known as
(a)
Width of the beam is 1/2 the width of the beam as it leaves the transducer.
(a)
What affects the focus?
(a)
Reflections arising from the (a) are more accurate than those from other depths
Truth or False: The focal zone is imprecise.
True
False
Determined by the size and operating frequency of the element or group of elements.
(a)
If frequency increases, NZL (a) .
(Increases or Decreases)
Relationship between: Frequency and NZL?
(a)
If the size of the element increases (aperture), the NZL (a) .
(Increases or Decreases)
Far Zone is also known as?
(a)
The region that lies beyond a distance of one near zone length
(a)
In Far Zone the beam width (a) with increasing distance from the transducer.
(increases or decreases)
At the Transducer, the beam diameter is (a) with the transducer diameter.
(1/2, equal, wider)
At the Focus, the beam diameter is (a) with the transducer diameter.
(1/2, equal, wider)
At the 2 Near Zone Length, the beam diameter is (a) to the transducer diameter.
(1/2, equal, wider)
Deeper than 2 NZL, the beam diameter is (a) then the transducer diameter. (1/2, equal, wider)
Focusing improves (a) .
Focusing is only accomplished in the (a) .
Shallow or Deeper Focus?
Small diameter PZT & Lower frequency.
(a)
Shallow or Deeper Focus?
Large diameter PZT & Higher frequency.
(a)
What is the best estimate of the diameter/width of the sound beam as it exist the XDR?
(a)
What is the diameters of the sound beam at a depth of 8cm?
(a)
What is the diameter of the sound beam at a depth of 16cm?
(a)
A pair of 5 MHz XDR are identical except for their PZT diameter. One is 6 mm and the other is 10 mm. Which XDR will have the shallower focus?
(a)
A pair of 10 mm diameter XDR are identical except for frequency. One is 4 MHz & the other is 8 MHz. Which will have the shallower focus?
(a)
Gradual spread of the beam in the far field.
(a)
Characteristics of the transducer to determine divergence. (____ and ____)
(a)
A pair of 5 MHz XDR are identical except for their PZT diameter. One is 6 mm & the other is 10 mm. Which XDR will be more compact (smaller divergence) in the far field?
(a)
A pair of 10 mm diameter XDR are identical except for frequency. One is 4 MHz and the other is 8 MHz. Which will spread out more (bigger divergence)?
(a)
Less or More Divergence: Large diameter PZT & Higher frequency.
(a)
More or Less Divergence: Small diameter PZT & Lower frequency
(a)
Relationship between: Transducer Diameter and Focal Depth
(Inverse or Direct)
(a)
Relationship between: Frequency and Focal Depth
(Inverse or Direct)
(a)
Relationship between: Transducer Diameter and Beam Divergence
(Inverse or Direct)
(a)
Relationship between: Transducer Frequency and Focal Depth
(Inverse or Direct)
(a)
