wire rope winch This is because the laser is directional

Ranging laser light is one of the earliest applications. This is because the laser is directional , high  brightness , good color and many other advantages . 1965 years ago the Soviet Union using laser measuring  the distance between the Earth and the Moon (380 × 103km) error of only 250m. After the Americans landing  on the moon in 1969 set the mirror on the lunar surface , but also with a laser to measure the Earth-Moon  distance , the error is only 15cm. [ 14 ] Although the high -precision laser distance sensor has been  listed for many years , but because of its price is too high , has not been widely used . Recently, due to  the significant permanent magnetic lifter decline in their prices , making it a cost-effective areas ranging approach. After  comprehensive consideration , we decided to take the lead in the industry of weight using laser distance  sensor for non-contact position measurement, this not only ensures the safety test accuracy and test  process can be slipped easily measure the amount of brake weights , lifting parameters such as speed and  position to solve the wire 20 , Southeast University, master's degree thesis ( 1 ) spatial segregation :  Let susceptible to interference away from the interference source crane trolley signal lines or circuits , this is the  most effective measures to suppress interference sources. Avoid parallel lines and the strong and weak  signal line signal lines away from strong electrical feeder lines must go alone . Must not be mixed with  the signal line to pull together ; must take the analog signal and digital signal lines separate line ;  avoid strong signal line parallel with the weak signal line , if the conditions as much as possible so that  the two orthogonal . ( 2 ) Screening: overcoming the electric-field coupling is the most effective method  of interference shielding . Because placed in the hollow conductor or metal objects are not affected by  external electric field . However, when an electric field coupling interference shield , the shield  conductor layer is preferably not connected at both ends