Tokyo Keiki KRG-10, User Manual

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7-6
7.9 Double Bounce removal
There is a case where the reflected wave from the liquid surface not only is received by the antenna but
that received by the antenna is reflected by the liquid surface back reflection in (ceiling) the tank upper
surface, for antenna mounting position and tank shape. It calls Double Bounce.
In the case of flat tank
top in particular, there is a possibility to recognize signal strength error is larger than the reflected wave
from the liquid surface.
It is possible to remove the abnormal value by performing the Double Bounce
configuration, refer to 6.6.2 Outlier removal .
And there is a function to calculate the offset to the tank top from the flange end necessary to double
bounce removal, refer to
6.9 Measuring Double bounce offset calculation .
7.10 Effect of structure such as a ladder
If the structure and the antenna mounting position is close, the reflection from the structure is received
in the antenna, there is a case to make a false recognition.
If that is possible, recommended to remove
the structure or change the antenna mounting position.
As the next measure, it may become smaller reflected wave from the structure by changing the
polarization direction of the microwave, refer to
2.7 Tips for stable measurement .
As the next measure, it is possible to mask the unwanted reflected wave by changing the noise table,
refer to
6.8 Echo Viewer .