Olympus EPOCH 1000 Series - Figure 15-1 A-Scan and S-Scan with Viewable Gate

910-269-EN, Rev. B, June 2011
270 Chapter 15
Other phased array instruments might display true-depth gates, which appear as
straight horizontal lines on the S-scan image. These gate start and gate end
positions correspond to depths within the test piece, not sound paths. True depth
and sound path gates are only equivalent at the 0° focal law.
Since gates are represented as sound path values, any displayed gate appears as a
curved line on the S-scan image. The gate start position is represented with a single
curved line across all focal laws, and the gate end position is represented with a
second curved line across all focal laws. This gate end position is defined using the
Gate Width parameter.
Figure 15-1 A-scan and S-scan with viewable gate
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