a hand-held laser range finder accoppiabile to calculate the distance to a target, and method of operation

摘要

A LASER rangefinder (2) comprising an emitter stage (4) to emit LASER pulses, a receiver stage (5) to generate electrical distance signals (SD) based on the LASER pulses received, an optical splitter (7) and a processing unit able to: sample each electrical distance signal (SDi) to determine a first vector (PV) containing first sample values (pvi); filter the first vector (PV), through a digital low-pass filter, to determine a second vector (SV) containing second sample values (svi); determine a third vector (TV) containing third sample values (tvi) determined by subtracting the second sample values (svi) from the corresponding first sample values (pvi); calculate a standard deviation (s) on the basis of the third sample values (tvi); calculate a plurality of detection thresholds (SR(i)) based on the standard deviation (s), the second sample values (svi) and a predetermined coefficient (oi(i)); compare each first sample value (pvi) with a corresponding detection threshold (SR(i)); and calculate the target distance (D) based on the result of the comparison.