Interface Parts; Lrf Background Information; Rangefinder Principle; The "Pulsed Diode - Safran LRF 3013 Manual

LRF 3013 Integrator Manual
1.1.2

Interface parts

The mechanical interface of the LRF module base plate is defined by

Three point mounting base with three threaded holes

Two positioning holes
The electronic interface of the LRF module is defined by one system connector for

Power supply & Serial interface

2 LRF Background Information

2.1 Rangefinder Principle

The "Pulsed Diode"

2.1.1
When the laser rangefinder is activated, a series of laser pulses from the transmitter diode are sent
through the objective lens to the target. For a good
result, most of the laser pulses have to hit the target.
The main part of the laser light is absorbed or diffusely
reflected by the target and only very small percentage
of the light is reflected back to the LRF module. This
remaining laser light is received by the opposite
objective lens and focused on the receiver diode. The
receiver diode (detector) starts sampling its echo with
a very high frequency.
Figure 3 below indicates how laser pulses are emitted from the transmitter, reflected at the target and
sampled by the receiver.
Figure 3: Pulsed Diode – Laser Pulses
Document number: TML 913655 ver A
Confidential & Proprietary  Safran Vectronix AG – All rights reserved
Measurement Example:
Measurement time (return flight) = 6.66 µs
Time of flight (one way)= 6.66 µs / 2 = 3.33 µs
Slope Distance r = light speed x time of flight
= 300'000 km/sec x 3.33 µs = 1'000 m
Public: 13.03.2017
page: 8/36