Calibrated Reflectivity Value (Version 2.0)
– Version 1.0 of the HDL32E reports in the data packages the measured distance as well as a value
labeled intensity. The reported intensity value is based on one of 11 laser powers that the sensor
has dynamically chosen based on best signal to noise ratio on the detector for the previous shot
form that laser.
• Low reflectivity targets generate small signal and a high laser power is chosen and reported.
• High reflectivity targets report a high signal and a low laser power is chosen and reported.
• Therefore in V1.0 the reported laser power values are an inverse measure of the reflectivity.
– Version 2.0 of the HDL32 measures the true reflectivity of a target independent of laser power and
distance with true 256bit resolution.
• Diffuse reflectors report values from 0 to 100 for 0-100% reflectivity
• Retro-reflectors report values from 101 to 255 with 255 being the reported reflectivity for an ideal retro-reflector
and 101 – 254 being the reported reflectivity for partially obstructed retro-reflectors or imperfect retro-reflectors.
– The HDL32E is calibrated using commercially available reflectivity standards.
– A ~95 m test range allows for accurate calibration of reflectivity values independent of distance.
– As a result of better differentiation between diffuse reflectors and retro-reflectors, diffuse reflectors
are now represented with values in the range from 0-100 and retro-reflectors from 101-255.
– Distances of < 0.5 m and from beyond the detection range are reported as zero meters.
– Depending on the users choice of color scaling, this might result in a shift of colors from what the
user is used to. Adjustment of color scaling corresponding with the definition for diffuse and retro-
reflectors in Version 2.0 will help with better differentiation for the reported calibration values.
– A customer reported error were retro-reflectors “plume” out and form a “cloud” or “ghost image” in
front of or behind their exact location has been fixed.
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