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At present, according to the working principle and whether to add a compensation mechanism or not, the laser scanners commonly used in China can be roughly divided into three categories: bubble laser scanners, automatic leveling laser scanners and electronic automatic leveling laser scanners.
Folding bubble Laser Sweeper
The sj2 and SJ3 laser scanners developed by Beijing optical instrument factory in 1996 are simple in structure and low in cost
The low cost bubble laser sweeper is suitable for construction, interior decoration and other construction work. After passing through the pentagonal prism, the laser beam is divided into two beams. One beam directly passes through the pentagonal prism, and the other beam changes the direction of 90 degrees. The rotating head of the instrument is driven by the motor through the belt to form a scanning laser plane. The instrument is equipped with a long leveling instrument for Anping instrument. (like the bubble level, the leveling instrument is based on the level, that is to say, the horizontal error of the laser plane depends on the accuracy of the level. If the instrument is placed horizontally, the vertical plane scanned by the laser can be obtained according to the vertical level.) The accuracy of this instrument is largely affected by human factors.
Due to the requirements of fast and convenient operation in engineering construction and high precision in some special occasions, bubble leveling is difficult to meet the requirements. Therefore, various automatic laser instruments emerge as the times require, and some unique leveling methods are produced
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