GSSI UtilityScan, Быстрый старт

Страница: 35 / 56

UtilityScan Quick Start Guide Page 29
Focus
Focus mode is designed to aid visibility by applying a migration process to the data and displaying the results in a split
screen with the unprocessed data. Migration is a filter which removes the dipping tails from hyperbolas and collapses the
reflected energy back to the center of that hyperbola. It is especially useful if you are trying to image utilities through a
rebar mat or many tree roots. It is available during data collection and processing. Focus image quality depends on having
an accurate dielectric value. GSSI suggests doing a depth calibration with either Set Depth or Set Dielectric prior to using
focus.
For collection, choose your Focus type in the Scan Setup screen. The options are On/Off/Plus.
Focus On/Off:
This will display focused data in the top pane and remove the tails from hyperbolas. Phase information
(white/black color sequence) of the data will be preserved. This is best for locating utilities and attempting to identify the
pipe material (metal vs. non-metal) by the phase, or void detection.
Focus Plus:
This will also display focused data in the top pane and remove the tails from hyperbolas. In addition, it will
perform a Hilbert Transform process and remove the phase information. This is best for situations where you do not need
the phase information and only want to know strong vs. weak reflection. Examples would be grave location or utility
locating in an environment with many rocks and/or tree roots.
Tapping the focus button while collecting/playing back data will turn your currently selected focus method on and off.
During data collection, the Focus button is available whenever the backup cursor is displayed.