RS-Ruby Plus User Manual
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Figure 4-1 Definition of Reflectivity
4.4 Laser Return Modes
4.4.1 Principle of Laser Return Modes
RS-Ruby Plus supports multiple laser return modes, namely: Strongest, Last, First, and Dual.
When set to Dual Return mode, the details of the target will increase, and the volume of data is
twice that in the Single Return mode.
Due to beam divergence, multiple laser returns are possible from any single laser shot. After a
laser pulse is shot, the beam size becomes larger and larger as it travels in the air, when a beam is
large enough to hit multiple objects, it will produce multiple reflections.
RS-Ruby Plus analyzes the received multiple returns, and can be set to only report the strongest
return, first return or the last return each time in the single return mode, or report the strongest
and last return, the strongest and first return, or the first and the last return at the same time in
dual return mode, depending on the laser return mode settings. If it is set to the strongest return
mode, only the value of strongest return will be reported. Similarly, if is set to the last return
mode, only the value of the last return will be reported.
Diffuse Reflectors
Black, absorbent diffuse reflector
Reflectivity ≈0
White, reflective diffuse reflector
Reflectivity <100
Retro-Reflectors
Retro-reflector covered with-
Semi transparent white surface
Reflectivity>100
Retro-reflector without any coverage
Reflectibity≈255