LeddarTech LeddarOne, User Manual

Page: 11 / 52

LeddarOne
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User Guide Page 11 of 52
1.2. Underlying Principles
Created by LeddarTech, LEDDAR™ (light-emitting diode detection and ranging) is a unique
sensing technology based on LED illumination (in either the visible or the infrared spectrum) and
the time-of-flight of light principle. The LED emitters illuminate the area of interest (pulsed at high
frequency) and the single channel sensor receiver collects the backscatter of the emitted light and
measures the time taken for the emitted light to return back to the sensor. A single photodetector
is used and provides a full-beam sensing module. Full-waveform analysis enables detection and
distance measurement of multiple objects in the beam, provided that foreground objects do not
fully obscure objects behind them. Oversampling and accumulation techniques are used to
provide extended resolution and range.
Figure 3
illustrates the illumination area and detection segments of the Leddar™One module.
Figure 3: Illumination Area and Detection Zone
The core of Leddar™ sensing is the pulsing of diffused light, collection of reflected light (including
oversampling and accumulation), and full-waveform analysis. The light source type, the number
of light sources, the illumination and reception beam, and the number of photodetectors can all be
tailored to fit specific application requirements such as detection range, beam and spatial
resolution.