Green laser pointer is in accordance with the requirements of thecustomer

Figure 3.32 shows the directional principle of the scanner. Figure 3.32 scanner orientation principle. Classification of 3D laser scanner. Different angle of thinking usually lead to different classification results in this category, we consider the following factors: instrument scan (such as 360-degree horizontal scan, the size of the instantaneous field of view, the scanning section); deviation system of the instrument (the instrument axis system rotation or mirror rotation); with the combined application of other instruments, such as built-in or external camera, GPS receiver; divided in accordance with the laser beam is fired. Its use is limited, such as coordinate measuring machine is shown in Figure 3.33 (b) Based on this principle. Fan beam scanning instrument. Actually, the customized service of  green laser pointer is much humanized for the customer.
This type of scanner point cloud density and accuracy are high, the majority of scanners are shown in Figure 3.33 (c). Figure 3.33 laser beam fired way classification. Divided according to the scanner's scan imaging. Photographic scanning. This type of scanner instantaneous field of view (FOW) is limited, it is similar to the photogrammetric camera. Lycra CYRA2500 (HDS2500) and OPTECH of the ILRIS 3D scanner in this category. It is suitable for outdoor objects scan. In particular, is a great advantage for long distance scanning. Panoramic scanning. This type of scanner field of view is limited to the instrument itself, such as a tripod. It is suitable for indoor scanning, such as digital housing, equipment, etc.. Such devices Imager 5003 or CALLIDUS. This kind of wireless presenter  green laser pointer can be widely used in the daily work.
Hybrid scanning. It integrates the advantages of these two types, the horizontal direction of shaft rotation is not subject to any restrictions, limitations of the rotation in the vertical direction by the mirror. The GS200 (MENSI) and the LMS Z360 (RIEGL) are of this type. Classification results shown in Figure 3.34: Figure 3.34 by way of scanning and imaging classification. However, there is a generic scanner can complete all the possible applications. A scanner may be suitable for indoor middle-distance scanning, another may be more suitable for long-distance outdoor scanning. Application the user wants a different purpose to choose the right scanner. Divided according to the scanner location principle. Terrestrial 3D laser scanner to scan the target, reflected Electronic Total Station, the two angle in the center of the scanner and the surface of the object to be scanned and a slant range.  green laser pointer and blue laser pointer are becoming more and more common.
Common ranging principle of 3D laser scanners include: time-based drift theory (time-of-flight). Most scanners ranging and are based on this principle, this principle of distance measurement range can reach a few hundred meters. Even scan range of up to one thousand meters is possible (including Mensi, Riegl products). But in a wide range of scan ranging, precision is relatively low. Based on the phase measurement principle (Phase measurement). Mainly used for the measurement of medium-distance scanning. The scan range is usually limited to within 100m, compared with the time shift principle, its accuracy can reach the mm level. Based on the laser radar or optical triangulation principle (Optical triangulation Laser Radar). The red laser technology adopted by  laser pointer    was relatively more mature.