Measuring principle
The N1 multispectral 3D scanner combines the 3D measurement with the multispectral measurement and provides the colored 3D point clouds in RGB and NIR colors.
3D measurement​
The N1 measures the 3D coordinates by laser triangulation method. The 3D unit has a laser line generator projecting thin laser line on target. By measuring the laser line displacement on the 3D camera image, the N1 calculates the distance Z and the lateral coordinate X of the object along the laser line.
The laser triangulation method guarantees high precision of acquired 3D data and ease of integration into production lines.
Multispectral measurement
The multispectral unit measures near-normal reflectance of the target in visible (RGB) and NIR (730nm) spectral range. It has a high power LED flash unit, the collimating optics, the diffusor, and the multispectral camera. The LED light is shaped by the collimating optics and the diffusor into the narrow stripe pattern. The multispectral unit is aligned in a way that the projected light stripe overlaps the laser line. The reflected light intensity is measured by the multispectral camera. The multispectral camera takes images with LED flash ON and OFF for each color channel (R,G,B,NIR730). By substracting the reference images (LED flash OFF) from the signal images (flash ON), the effects of ambient light can be eliminated.
Data fusion
The measured multispectral intensities (R, G, B, NIR 730) and the measured laser intensity (NIR 940) are then linked with corresponding 3D values and normalized. The data is output as a multidimensional point cloud with 3 spatial coordinates and 5 color values (X, Y, Z, R, G, B, NIR 730, NIR 940).
Measurement modes
N1 supports FAST and HDR measurement modes. The FAST mode was developed for dynamic applications with moderate ambient light (indoors, artificial lighting, no strong reflections). The HDR (high dynamic range) mode is used under direct sunlight or with particularly demanding materials (high contrast or very shiny surfaces).
High speed: Up to 1,500 Hz in FAST and up to 1,000 Hz in HDR mode.
Measurement under direct sunlight: N1 features HDR (high dynamic range) technology, which enables measurement even under difficult conditions such as direct sunlight and/or shiny surfaces.
