The development and application of 3D laser measurement technology

With the development of laser technology and electronic technology, laser measurement has developed from static point measurement to dynamic tracking measurement and 3D stereo measurement. At the end of the last century, CYRA in the United States and MENSI in France took the lead in developing laser technology into the field of three-dimensional measurement. Among them, CYRA's 3D measurement technology focuses on the measurement application of medium and long-distance (50 meters-200 meters) targets, and can obtain a measurement accuracy of 6 mm to 4 cm. It is used for modeling and monitoring of large projects such as building models, ground construction, power stations, and ship design; while MENSI focuses on short-distance high-precision 3D measurement applications. Since it can achieve an accuracy of 0.25 mm, it provides a new measurement method for industrial design, equipment processing, and quality monitoring. In 2000, NASA had successfully applied 3D measurement technology in the design and processing process.

Now, 3D measurement technology has developed a longer working distance and more application areas. I-SITE's 3D laser scanner has a working distance of 800 meters, which is suitable for larger-scale field monitoring, such as open-pit coal mines. 3D laser measurement has also been applied to the field of aerial measurement, namely LiDAR . Traditional remote sensing technologies include satellite remote sensing, aerial photogrammetry, etc. However, satellite remote sensing technology is large-scale, costly, has many constraints, and lacks flexibility. Aerial photogrammetry is expensive and requires high equipment. In contrast, 3D laser scanning equipment can accurately measure ground targets in 3D at low altitudes of 100 to 450 meters, with an accuracy of up to 10 centimeters. Its low cost and flexibility expand aerial survey technology to more and wider ranges. LiDAR is not only widely used in the military, but also has very broad application prospects in water conservancy, electricity, transportation, flood control, landslide monitoring, forestry and other fields.

The picture shows 3D laser measurement technology

3D laser measurement has very high requirements for software processing. It requires professional processing of measurement information, and then combined with AutoCAD software modeling and application. Its working steps include: measurement, surface treatment, software stitching, 3D modeling, application data, etc. Compared with traditional methods, 3D laser measurement has extremely high work efficiency, which can greatly speed up the speed of engineering, monitor and obtain reliable accuracy.

3D laser scanning technology has been successfully applied in many fields such as civil engineering, industrial design, ground model, road and bridge design, shipbuilding, geographic data collection, site protection, open-pit coal mines, and building monitoring. Its high efficiency and low cost have been widely recognized. For example, based on the experience of the United States in applying 3D laser measurement technology in the construction of highways and overpasses, each project can shorten the construction period by about 4 to 6 months, and there is no need for surveyors to enter the highway or bridge to work, and the target section can still remain unobstructed. While ensuring high precision and saving costs, it also achieves the greatest social benefits.