Leddar Technology Fundamentals
In a Nutshell
Leddar is essentially an ensemble of software, proprietary algorithms and know-hows, made available on ICs, and used to build various types of optical sensing devices. The patented Leddar technology has been created, developed and commercialized by LeddarTech.
Leddar is a Lidar detection and ranging technology that can detect, locate and measure objects (including liquids and people) in a given field of view. In the remote sensing technologies taxonomy, it is part of the active time of flight category, along with other technologies such as radar or ultrasound. Within this category, Leddar is a light-based approach which is qualified as direct optical time-of-flight.
Technology Abstract and Constitutive Elements
Leddar works by emitting invisible pulses of light, reading the return echo of these pulses, and digitally converting and processing the signal to assess the presence and position of objects in its field of view. The shape, range and resolution of the detection zone can vary depending on the optical components (e.g.: lenses) used to build the sensing device.
Leddar is an optical detection and ranging technology, which means it relies on principles of optics to emit light and receive the backscatter from objects. A photodetector is also required to capture the light echo and transpose it into an electrical signal.
These three elements (light source, optical components, photodetector) are part of all Leddar-based devices. Depending on the target application, they can vary in size, shape, weight and performance.
From LeddarCore ICs to Complete Sensor Modules
Leddar can be delivered as an integrated circuit (IC) or assembled into sensor modules, depending on the application and the level of integration required by the client.
All Leddar sensors are built around the LeddarCore ICs, which contain LeddarTech’s patented signal processing technology.
In addition to the IC, all Leddar sensor modules need a light source (e.g., LED, VCSEL or Laser), a photodetector and optical components.
ELECTRONICS AND PACKAGING
Additional elements must be added to build fully functional, complete Leddar-powered sensors: processing, communication interfaces, packaging and power management, depending on the intended application, provides the required functionality to integrate into the final system.
Leddar Unique Benefits and Added Value
High range-to-power ratio. All else equal, Leddar provides the highest range Lidar in the industry.
Immunity to noise / Capability to detect targets in harsh or low-visibility conditions. Since each measurement is made from thousands of discrete light pulses and the processing rejects noise caused by particles in the air, Leddar sensors have demonstrated high reliability of operation in several applications where they are subjected in rain, snow, fog or dust. Also, by use of its own light source and again with its innovative noise rejection capabilities, Leddar works equally in low-light to high ambient light conditions, including strong sunlight.
Powerful data processing / Ability to resolve multiple targets with a single detector element. There are several benefits to digitizing the return signal. One example with significant added value is the capability to detect multiple targets at once. Even a single-element sensor can provide a high degree of spatial awareness.