Development Of Laser Imaging Measurement And Control System Based On The ARM

Laser imaging system is currently one of the most effective means to obtain 3D information of the measured object. It has many practical characteristics, such as good directivity, high angular resolution, strong anti-interference ability, wide measurement range and no cooperation objectives required generally. At present, this technology has been widely used in aviation aerospace, military reconnaissance and topographic mapping as well as many other fields. Laser imaging measurement control system based on ARM is a combination of the embedded system, pulse laser ranging and galvanometer scanning technology. It possess the advantages of easy modular design and real-time information extraction and high-speed transmission, which has become a mainstream direction in the aspect of laser imaging system miniaturization design.Equipped with ARM core controller module on an embedded Linux computer operating system, this study selected 1.55μm pulse laser as a laser emission source, used pulsed ranging method, TDC-GP22 as the time interval measurement unit, and combined with the 2D galvanometer scanning technology to build laser imaging measurement control system so that can complete the 3D information acquisition.This study firstly introduced the basic theory of laser imaging system, discussed the pulsed laser transmitting and receiving, laser scanning imaging and high-precision interval measurement principle in detail. Combining with the actual needs and application environment, the technical indicators and the overall scheme were determined for this new system. Then based on the system design goal, we have further studied the narrow pulse laser emission, the laser pulse detection, the 2D galvanometer scanning and TDC time interval measurement etc., completed the circuit simulation and implementation, and tested the performance of circuits, such as the narrow pulse signal occurring and other key circuits. Finally, including the laser repetition frequency triggers, a 2D galvanometer scanner, programmable gain control, TDC interval measurement and kernel mode drivers of network communication, that all are performed on cutting and transplanting embedded Linux operating system, and achieved the drive control of underlying hardware under the corresponding user mode application controls.The ranging and imaging experiments have been carried out after the debugging success for the whole system, and the experimental results have shown that the system ranging error is 4.5cm, the imaging results of typical objects are clear, which have achieved the expected goals.