Design And Implementation Of Signal Acquisition And Control System Based On ARM And Linux

Daya Bay Reactor Neutrino Experiment is under the auspices of the Institute of High Energy Physics,Chinese Academy of Sciences.It is a large-scale international cooperation project that a number of international research institutions have joined.Princeton University of America assumed responsibility of designing the gas monitoring system of the slow control part.It is needed that acquiring output signal of the gas monitoring system and senting to the remote monitoring terminal over the network accurately,reliably,timely;responsing to the remote monitoring terminal's commands over the network and realizing the switch output control function in the same time.It will be helpful for obtaining reliable experiment data,it will be helpful for studying relationship beween the neutrino mixing angleθ13 and other physical quantities,it will be helpful for ensuring the progress of the entire Neutrino Experiment.Embedded Processor S3C2410 based on ARM9 features low power consumption, rich resources, high running speed, high performance and low cost,and so on.Linux operating system features open source, free operating system,rich driver,high network support capability,and so on.Designing system based on S3C2410 processor and the Linux operating system is cost-effective.Object-oriented application of this system includes four types' signal. From the perspective of input and output, there are three kinds of input signal,those are different range of voltage signal (including 0～5V,0 10V,±5V,±10V),4-20mA current signal, and switch signal;there are only one kind of output signal,it is switch output signal.The task of this system is that acquiring three types'input signal and senting to the remote monitoring terminal over the network timely,responsing to the remote monitoring terminal's commands over the network and realizing the switch output control function in the same time.The system mainly includes the following sections:power supply section,the embedded processor section, analog input section, the switch input section,the switch output section and the network communication section.In order to prevent damaging voltage from damaging the system and pevent the different device or sensor noise crosstalk from affecting the accuracy of analog data acquisition,it adopted isolation measure between each input channel, output channel and the core of post-acquisition system,different channels have also been isolated, power supply have also been isolated.The testing and trial run proved that the system worked correctly, stably, reliably.The precision and speed met the project's requirement.