Leica Geosystems TPS1100 Professional Series - User Manual - Manual (Page 13)

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TPS1100 - User Manual 2.2.1en Description of the system
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A laser distancer (EDM) is incorporated
into the instruments of the new
TPS1100 series.
In all versions, the distance can be
determined by using an invisible
infrared beam which emerges coaxially
from the telescope objective.
Very short distances may be
measured reflectorless in
Infrared-mode (e.g. to well reflecting
targets like traffic signs). In this case
the distances are corrected with the
addition constant defined for the
active reflector.
For applications without reflector, the
TCR and TCRA version also use a
visible red laser beam which emerges
in the same manner. A special
arrangement of the EDM, and
appropriate arrangement of the beam
paths, enable ranges of over five
kilometres to be attained with standard
prisms; miniprisms, 360° reflectors, and
reflector tapes can also be used, and
measurement is also possible without a
reflector.
Distance measurement
When a distance
measurement is triggered,
the EDM measures to the object
which is in the beam path at that
moment.
When measurements are being
made using the Reflectorless Red
Laser EDM, the results may be
influenced by objects passing
between the EDM and the intended
target surface.
This will occur because reflectorless
measurements are made to the first
surface returning sufficient energy to
allow the measurement to take place.
For example, if the intended target
surface is the surface of a road, but a
vehicle passes between the EDM
and the target surface as DIST or
ALL is pressed, the measurement
may be made to the side of the
vehicle. The result will be the
distance to the vehicle, not to the
road surface.
If you are using the Long Range Red
Laser EDM while measuring to a
prism, and an object passes within
30 m of the EDM as DIST or ALL is
pressed, the distance measurement
may be similarly effected.
In practice, because the measuring
time is very short, the surveyor can
always find a way of avoiding critical
situations.
Wrong result
Correct result
1100Z46
1100Z47