5.3  Reflectivity 
RS-Helios-16P measures the reflectivity of objects. The reflectivity is an index that measures the 
ability of an object to reflect light and is greatly related to the material of the object itself. Therefore, 
the reflectivity information can be used to distinguish objects of different materials. 
RS-Helios-16P reports calibrated reflectivity values from 0 to 255, among which diffuse reflectors 
report values from 0 to 100, and retroreflectors report values from 101 to 255. Black objects are 
with low reflectivity values, white objects are with high reflectivity values, the most ideal reflection 
reports the reflectivity value of 255.   
 
  Figure 7 Definition of Reflectivity   
5.4  Laser Return Modes 
5.4.1  Principle of Laser Return Modes 
RS-Helios-16P supports multiple laser return modes, namely: Strongest, First, Last 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 hot, the beam size becomes larger and larger as it travels in the air, when a beam is large