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One of the reasons that the XCT12 transducer is more suitable for underwater use
is its larger radiating face, were a smaller transducer to be used, the beam angles
would be wider.
Echo Processing
Echo processing consists of echo enhancement, true echo selection, and selected
echo verification. In clarifiers a large range of signals can be seen in a small
distance. The processing electronics needs to be configured carefully to get
consistent, accurate results.
Echo Enhancement is achieved by filtering (removing noise, P821 and P822) and
reforming (connecting fragmented echo peaks, P823) the echo profile (digitized
signal representing the echo signal received).
True echo selection is achieved by establishing the criteria which a portion of the
echo profile must meet to be considered the true echo (echo reflected by the
intended target).
Insignificant portions of the echo profile outside of the measurement range (Span
P007 + Range Extension P801), below the TVT Curve (P830 to P835), and less
than the Confidence Threshold (P804) are automatically disregarded.
The remaining portions of the Echo Profile are evaluated using the Algorithm
(P820) programmed. When a combination of Algorithms are used, the portion of
the Echo Profile providing the best averaged Echo Confidence (P805), is selected
as the true echo.
True echo verification is automatically achieved by comparing the position
(relation in time after transmit) of the "new" echo to the previously accepted echo
position.
If the new echo is within the Echo Lock Window (P713), the new echo is accepted
and displays, outputs, and relays are updated as restricted by the Fuzz Filter
(P710) and Rate Parameters (P700 to P703). If the new echo is outside of the
Echo Lock Window, the new echo is not accepted until Echo Lock (measurement
repeatability, P711) requirements are satisfied.
Echo Processing Displays (Scope Displays, P810)
TVT
Curve
display
Near
blanking
(P800)
InterRanger DPS300
96
Echo
Lock
Window
display
Echo Profile
Echo
Marker
display
7ML19981BC01
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