T
ARGETING
Page 39
Electronic Copy of LTI’s Impulse User’s Manual 8
th
Edition © October 1998
When selecting a target, keep in mind that most
surfaces can be measured directly. However, long
distances, multiple potential targets, or lack of an
actual physical object to shoot to may require
additional techniques. Here are some hints, which
are discussed in greater detail later in this section:
• In the absence of a physical target, a simple
sheet of white paper suffices.
• When shooting to near wooded or brushy
areas, use a multifaceted reflector and the
instrument’s filtering capability to filter out
unwanted targets. We recommend a 3-inch red
bicycle reflector such as a Cole model 03-3305,
which is available in hardware stores. Note:
This technique is not effective at
long ranges due to the instrument’s reduced
sensitivity in filter mode.
• Long ranges are most easily acquired using a
spectral or retroreflector.
• Gating is helpful to isolate one target amongst
multiple potential targets. A measurement
window can be set up to reject targets outside
the range window.
• The absolute minimum range of the Impulse is
essentially zero: in theory, you can measure
objects right up against the front panel. You can
increase the minimum range artificially by
setting the short measurement gate.
• The absolute maximum range is about 575
meters (1880 feet). You can decrease the
maximum range artificially by setting the long
measurement gate.
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