ABC's of Ultrasonics
ABC's of Ultrasonics
ABC's of Ultrasonics
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Gates<br />
Gates Gates are are used used to to collect collect information information at at<br />
desired desired interfaces interfaces within within the the sample. sample.<br />
•The •The gate gate is is placed placed over over the the signal signal or or<br />
signals signals <strong>of</strong> <strong>of</strong> interest. interest.<br />
•The •The absolute absolute value value <strong>of</strong> <strong>of</strong> the the highest highest<br />
amplitude amplitude signal signal which which breaks breaks the the gate gate<br />
threshold threshold within within the the gated gated region region is is<br />
recorded. recorded. (Figure (Figure 1) 1)<br />
•If •If no no signal signal breaks breaks the the gate gate threshold threshold<br />
no no data data is is recorded. recorded. (Figure (Figure 2) 2)<br />
•Signal •Signal amplitude amplitude can can be be increased increased or or<br />
decreased decreased by by adjusting adjusting gain. gain.<br />
1<br />
2<br />
Gate Threshold<br />
Highest Amplitude signal<br />
No data recorded<br />
39<br />
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