Researches On Laser Demarcation Instrument For Self-motion Goal Trace

Laser Demarcation Instrument (LDI) plays a very important role in build construction such as bridge and house. Research into this technology is very in-depth abroad, but lag behind inside, especially the orientation manner depend on our hands, which is inconvenient to construction. Aim at this problem, this dissertation designs a self-motion goal trace figure control system based on the research of stepping motor drive and orientation technology, which is fit for LDI.Considering the cost,utility and power wastage, the system adopt the microcontroller unit (MCU) as the core of control part, the DC and stepping motor as the motivity. Compared subdivided driving in vector closed loop with subdivided driving in open loop, open loop is selected for stepping motor in the control strategy in the thesis.Target location identification is ascertained via detecting of the laser signal. The location signal of the target is transmitted to MCU by wireless, and then DC motor and step-motor is controlled to move by MCU. Stop order is achieved from the interrupt signal while target location is aimed by the laser.After the system's hardware and software's design being finished, precise measure is done on the subdivided stepping angle. Based on the measuring data, subdivided current's correction is done with MATLAB. The experiment proves that corrected subdivided driving improves the distinguish ability and low speed performance obviously.The running result of the control system is presented in the dissertation lastly. The outcome indicates that the control system of the laser demarcation instrument introduced in the thesis could exactly aim to the target automatically.