After more than 40 years of development, lidar technology has gradually developed laser tracking, laser speed measurement, laser scanning imaging, laser Doppler imaging and other technologies from the initial laser ranging technology. Therefore, a variety of different types of lidar have appeared, which are widely used in various fields. Lidar was not well-known to the public many years ago. Until the rise of robots and unmanned driving technology in recent years, lidar has gradually entered people's field of vision. In the beginning, Lidar was not only born for robots (including unmanned driving), it was also widely used in VR/AR, smart transportation, ocean exploration and fishery resource monitoring, 3D printing and other fields.
Unmanned driving is very popular in recent years, and lidar is the most important link in the field of unmanned driving. An unmanned car is a smart car that senses the environment through the on-board sensor system, automatically plans the driving route, and controls the vehicle to reach a predetermined goal. At present, the application of lidar includes functional modules such as unmanned positioning, roadside/driving area detection, lane marking detection, obstacle detection, dynamic object tracking, obstacle classification and recognition.
Lidar is also called the eyes of a robot. So how do these "eyes" help robots recognize objects and directions? It calculates the relative distance between the target and itself based on the turn-back time of the laser after encountering an obstacle. The laser beam can accurately measure the relative distance between the edge of the contour of the object in the field of view and the device. This contour information forms a so-called point cloud and draws a 3D environment map. For example, Huan Chuang Technology's lidar accuracy has reached the sub-millimeter level, which can better help robots provide services.
The National Laboratory of the United States has developed an integrated system that can perform three-dimensional lidar positioning and detection on the surface tissue of burn patients to determine the degree of damage. Using the detection and positioning results, the laser can automatically remove the necrotic tissue to facilitate the growth of new tissue. Researchers hope that this same-frequency continuous wave lidar mapping system can remove necrotic skin and muscles from the patient's body.
Airborne Lidar is an airborne laser detection and ranging system installed on an aircraft, which can measure the three-dimensional coordinates of ground objects. In the 1970s, NASA began to develop the LiDAR surveying and mapping technology airborne laser scanning, and its development speed was rapid, and it began to be commercialized at the end of the 20th century.
China’s attack lidar is already quite advanced, including the world’s top five core technologies: breakthroughs in laser materials research, breakthroughs in the physical mechanism of laser radiation materials and imaging maps, breakthroughs in one-time fast tracking positioning control technology, and high-density Breakthrough in energy reversible conversion carrier material and breakthrough in laser imaging technology. In addition, there are also great achievements in mine detection lidar, chemical reagent detection lidar, atmospheric monitoring lidar, and biochemical land combat lidar.
Environmental Ecological Monitoring
In recent years, environmental issues have received widespread attention, and lidar has become an advanced mainstream detection method in wind speed, soil erosion, sand and dust storm observation, and marine environment observation.
The lidar with the characteristics of high resolution, high accuracy, and large detection range can reflect the shape of the measured site in detail, and easily realize three-dimensional modeling, so as to truly realize non-contact measurement, expand the detectable range and reduce the external Industry hazards.
The Construction of Smart Cities
As the population of big cities continues to grow, the intelligent construction of cities has become more and more important. Information technology, sensor technology, communication technology and other technologies have a wide range of applications in the field of smart city construction. For example, it can be used for real-time induction control, adaptive control and green wave band control of signal light controllers, and it is also the basis for future road collaboration.
In games that use AR headsets, the space-aware positioning technology used will use lidar and many supporting optical sensors. Through SLAM technology (real-time positioning and map construction), you can accurately locate your position in three-dimensional space. To enhance the sense of real experience in the game.
Overview: Through precipitation and development, lidar technology has strong spatial expansion and has made many contributions in various fields, allowing people to see more of its possibilities. But for now, there is still room for improvement in the use of lidar. In the long run, the future market can be expected.