Views: 0 Author: Site Editor Publish Time: 2022-08-26 Origin: Site
Through the principle of laser ranging, the 3D laser scanner projects the laser light on the surface of the object to be measured, and then reflects it back to the sensor in the scanner. The scanner calculates the distance from the object and determines the position of the object in space. Get 3D point cloud data.
Since the 3D laser scanning system can obtain a large number of data points of the target object intensively, compared with the traditional single-point measurement, the 3D laser scanning technology is also known as a revolutionary technological breakthrough from single-point measurement to surface measurement.
Three-dimensional laser scanning systems are divided into airborne, vehicle-mounted, backpack and hand-held types. Among them, each type of laser scanner is aimed at different usage scenarios, and the accuracy is also different:
Airborne Laser Scanning Systems: Geodetic Mapping, Urban-Level Mapping
Ground-mounted laser scanning system: construction, decoration, curtain wall
Backpack Laser Scanning System: Planning and Mapping
Handheld Laser Scanning Systems: Industrial
Therefore, using different types of 3D laser scanners, we can easily collect high-precision, high-density 3D point cloud data of various small, large, complex, standard or non-standard scenes, and then quickly reconstruct true 3D model of the target scene.
1. Data acquisition automation, one-click operation
The 3D laser scanner is highly intelligent and does not require manual intervention. The laser automatically emitted by the 3D laser scanner can measure the 3D coordinate information of the surface points of the target object without complicated operations, and realize one-click automatic scanning.
2. "Fast" (1 million points per second)
"Fast" is a concept born from the birth of scanners. In conventional measurement methods, it takes about 2-5 seconds to measure a point. In complex scenes, it may take several minutes to measure the coordinates of a point.
The birth of the 3D laser scanner has changed this situation. Now the maximum speed of the 3D laser scanner has reached 1 million points per second, which is the basic guarantee for the 3D laser scanner to describe the objects in detail, such as ancient style, factory pipelines, tunnels, and terrain. Such complex fields cannot be measured has become a thing of the past.
3. All elements of data acquisition, high density and high precision (error is millimeter level)
3D laser scanning can quickly acquire high-precision, high-resolution massive point data in both horizontal and vertical directions. All objects visible to the naked eye (except glass, water, and specular reflection objects) can be scanned.
4. The data is a three-dimensional vector, simple and intuitive
The data measured by the 3D laser scanner each time not only includes the information of X, Y, Z points, but also includes the color information of R, G, B, as well as the information of the reflectivity of the object, so that comprehensive information can give people a kind of object. The feeling of real reproduction in the computer.
5. Non-contact measurement method to ensure work safety
Using the method of non-contact target, personnel can directly collect 3D data on the surface of the object without touching the object to be measured, which reduces the risk of measurement. It can effectively avoid the measurement danger of special-shaped buildings and dangerous scenes (high altitude, power plant, radiation), and provide safety for measurement.
6. Good digital compatibility
By directly obtaining the data collected by digital signals, it has all-digital features, which is convenient for post-processing and output, and has good sharing with Revit, AutoCAD, SketchUp, ArchiCad, Bentley, Tekla and other software.
7. Proactive, dynamic, real-time and intuitive
3D laser scanning technology achieves the purpose of collecting object data information by actively emitting laser signals to the measured object and recording the time of the laser echo, so it is not restricted by the scanning environment such as temperature, air pressure, light, etc., and has high work efficiency. After the scanning is completed, the collected point cloud data can be displayed, which is convenient for the operator to view on the spot.
8. Compact structure and strong protection
At present, the commonly used scanning equipment has a compact structure, which makes the whole compact, flexible and convenient to use. It is waterproof and moisture-proof, and has strong environmental adaptability, which is more conducive to field measurement.
9. Can be used with external cameras and GPS systems.
Combining with other equipment expands the scope of use of 3D scanners and makes the obtained information richer and more accurate. With the GPS system, it can not only improve the single-point positioning accuracy, but also use more flexible, greatly expanding the application range.
Today, 3D laser scanning technology has achieved certain results in the fields of cultural relics protection, architecture, planning, civil engineering, factory renovation, interior design, building monitoring, traffic accident handling, disaster assessment, ship design, and military analysis.
In the future, with the advancement of technology and the development of the surveying and mapping industry, 3D laser scanning technology will be more widely and deeply applied, contributing more successful products and technologies to the national real-world surveying and mapping industry.
