Blickfeld solid-state LiDAR is characterized by innovative system architecture and on-device processing.
In order to reach the range required for automotive applications, an especially large aperture is needed. Blickfeld has developed patented technology that makes it possible to manufacture MEMS mirrors with a diameter of more than one centimeter.
Thanks to the Blickfeld mirror control, the vertical resolution and frame rate of the LiDAR sensors can be flexibly adjusted even during operation. This allows, for example, the dynamic definition of focus zones in which more detailed data is captured.
Sensor Series Production
Blickfeld manufactures the mirrors with photolithographic production techniques that allow the highest levels of precision even with large quantities. In a highly automated process, a standard silicon wafer is turned into hundreds of MEMS components simultaneously – a method that has been applied and optimized in the semiconductor industry for decades.
905 nm Laser Source
Blickfeld LiDAR sensors use a 905 nm laser source. These laser diodes are very cost-effective and eye-safe, but can only be used with limited power: The Blickfeld setup meets this challenge with an uncommonly large aperture in order to achieve remarkably long-range detection and a wide field of view.
Straylight Suppression through Coaxial Design
The proprietary Blickfeld setup is coaxial, meaning that the optical path of the light is almost identical on the way to the object and back to the detector. As a result, only the photons from the exact direction in which the laser was sent are collected and as little background light as possible is considered. This provides spatial filtering to achieve the best signal-to-noise ratio, contributing to a long detection range.
SiPMs – Solid State Silicon Detectors
The silicon photomultipliers used by Blickfeld are arrays of SPADs connected in parallel that provide high-precision measurements at low operating voltages. The resulting dynamic bandwidth ensures that Blickfeld LiDARs reliably detect both weakly reflective distant objects and highly reflective objects at close range.
Digital Signal Processing
Through careful signal processing, which contains filtering, correlation, and statistical analysis, the Blickfeld software determines exact positions in the three-dimensional space. The Blickfeld algorithms run on state-of-the-art integrated computing hardware.
Blickfeld sensors do not only collect detailed 3D data, but are also capable of computing and providing enriched information through on-device pre-processing. This pre-processing is accomplished by a high-performance computing chipset integrated into the LiDAR. The algorithm library includes various pre-processing algorithms, e.g. an algorithm that enables dynamic motion detection. where the static background within the point cloud is identified and removed so that the device transmits only motion information: Dynamic objects, such as people and vehicles, are detected and highlighted along with their movements
Data Processing Algorithms
The Blickfeld perception stack is designed to be used for various applications in the automotive, industrial, agricultural, smart city, and security sectors. Blickfeld algorithms enable, among other things, object recognition, classification and counting, motion tracking, localization, volume measurement, background subtraction, and recognition of drivable areas.
Fusion of Several LiDAR Sensors
In order to capture larger areas, the data from multiple Blickfeld LiDAR sensors can be easily merged. The tracking of objects also works smoothly in the transition area between point clouds of different devices, thanks to high-performance algorithms.
Time of flight principle