English
A multi-line laser usually refers to a laser module capable of emitting multiple lines simultaneously. Through appropriate optical path design and control, this laser achieves multiple parallel line laser spot output through DOE gratings. It is usually used in specific application scenarios, such as structured light systems, handheld 3D scanners, 3D reconstruction and other fields.
1. Working principle:
Multi-line lasers use laser diodes as the main light source. By absorbing electrical energy, the semiconductor working material achieves energy level transitions. Inside the optical resonant cavity, the laser continuously oscillates and amplifies, and the laser is generated and emitted. The laser diode emits a laser beam through the DOE grating. Regular scribing on the DOE grating will change the propagation direction of the laser and obtain the pattern we need.
2. Pattern types of multi-line lasers:
The multi-line laser can customize the number of laser lines of any specifications such as 3 lines, 5 lines, 7 lines, 9 lines, 11 lines, 13 lines... etc., on top of this, it can also be integrated to achieve a suitable handheld 3D Scanner's composite beam.
Single multi-line laser
The laser lines of a single multi-line laser are parallel to each other. Usually the beam size can be adjusted manually, the laser power is 200mW, the laser wavelength is 650nm, 850nm, the uniformity of the laser line is greater than 80%, and there are no dark areas at both ends.
Two-in-one multi-line laser
The multi-line beam pattern is formed by two multi-line lasers crossing and overlapping at 45°. The commonly used laser wavelength is 450nm. The effect of the multi-line laser spot is as shown below.
Three-in-one multi-line laser
The multi-line beam pattern is composed of three multi-line lasers that overlap each other. The laser wavelength is 450nm, 200mm~400mm optional, and the focal length error is ±1mm.
3. Multi-line laser application:
1. Structured light scanning application: Multi-line lasers are widely used in three-dimensional measurement and surface detection of structured light scanning. By outputting multiple beams at the same time, rapid and high-precision measurement of multiple feature points or areas of the target object can be achieved. It can be used in workpiece inspection, quality control and other fields.
2. Three-dimensional reconstruction application: The application of multi-line lasers has expanded virtual reality, augmented reality and digital cultural relics protection: In the field of cultural relics protection, structured light systems using multi-line laser light sources can be used for high-precision three-dimensional scanning and reconstruction of cultural relics. structure for digital preservation and display.
3. 3D scanner application: Industrial manufacturing requires a large number of scanning and inspection processes. Multi-line lasers can be used in industrial manufacturing workpiece surface quality inspection, reverse engineering, product design, or to produce high-quality 3D models based on human body or biological samples. Customized products with precision.