The Development Of Data Collecting And Controlling System For Falling Weight Deflectometer Test System

The data collecting and controlling system, which applies an impulsion load to the surface of road with the heavy hammer controlled by hydraulic pressure falling freely from a certain height, and utilizes the sensors array laid along the axes of load to collect the defect data from the surface of road, is an important part of the falling weight deflectometer test system for the road. The system is the unit of the controlling, data collecting, and data analyzing, which including the controller of data collecting and a computer with the Data-Analysis Software.In the paper, we first have introduced simply the falling weight deflectometer test system for the road; we have discussed the requirement of property and standard of technology for the data collecting and controlling system. With the principle of the practicability, stability, and extensibility, we have developed a practical hardware and software together method based on the embedded technology, and further, designed an electrical circuit, which the ARM microprocessor S3C44BOX is as a core for each hardware unit, in the data collecting and controlling system. We have debugged and tested the code in the field by theμC/OS-Ⅱimplant technology operating system. In the paper we have discussed and solved the problems occurred in the process of drawing printed circuit and debugging code. Additionally, we have used VC++ to the related programming according to the analysis of the data processing software to the interface, structure, and function. Finally, we have summarized our develop work, and put forward to future plan to improve the property functions of the data collecting and controlling system and promote the operating system.Now our system has been delivered to the user, and it has been tested in various fields.