小型宇宙射线探测仪的模拟和测量

介绍了一款小型宇宙射线探测仪。该仪器具有宇宙射线科普演示功能,主要用于实时测量μ子射线并显示计数,以及长时间尺度下（年）稳定地对不同角度的次级宇宙线通量进行监控记录。简要地展示了探测器的硬件构造和探测效率的模拟计算。探测仪单个探测器的探测效率为93.1%,两个探测器符合测量的探测效率为86.6%。根据探测器的计数率以及模拟计算的探测效率,估计了次级宇宙射线垂直地面方向的通量,为J=29±3 m-2 sr-1 s-1。另外,利用该宇宙射线探测仪,测量了兰州市区的次级宇宙射线的天顶角分布。其结果很好地满足I（θ）=IH+I₀ cosα θ经验公式,其中的角度依赖参数α=2.42±0.52。A small cosmic ray device is introduced in this paper.It has the demonstration function for popularization of science,and can be used mainly to display the μ counts in a real-time measurement,and to monitor the secondary cosmic ray flux at different angles in a very long time scale (years).We briefly show the hardware of the device and the detecting efficiency calculation by simulation.The detecting efficiency for one detector of the device is 93.1%,and the detecting efficiency is 86.6% for the coincidence measurement of two detectors.Based on the count rate by the detector and the simulated efficiency,the secondary cosmic ray flux perpendicular to the ground surface is measured,which is J=29±3 m-2sr-1 s-1.Moreover,with an application of the device,we measured the angular distribution of the secondary cosmic ray rate in Lanzhou City.The resulting angular distribution agrees well with the empirical formula as I(θ)=IH+I₀ cosα θ,in which the parameter for the angle-dependence is α=2.42±0.53.     

基于MSP430F169和CPLD的综合报警平台设计

介绍了基于MSP430F169 混合数字信号处理器和EPM1270T144C5N 复杂可编程逻辑器件(CPLD) 而设计的综合报警平台系统。MSP430F169 混合信号处理器具有超低功耗、处理能力强、系统工作稳定等优点。EPM1270T144C5N 是一种具有144 只管脚的复杂可编程逻辑数字器件,可以实现同时对多个不同的设备报警信息采集与处理。该综合报警平台对HIRFL-CSR 上运行的各个分散的监测报警系统所产生的报警信息进行综合收集处理与报警,主要是先根据现有已上传到监测报警系统服务器中的原始数据进行条件判断,服务器根据判断结果发送相应的指令,MSP430 利用UART功能和网络协议转换器配合接收;然后MSP430把接收到的指令数据解析后送到CPLD 数据端口,由CPLD 控制连接的报警器,实现报警功能;也可利用CPLD 多管脚的优势,控制其他的现场设备。MSP430F169 内部的12 位ADC和DAC 模块可实现对现场设备的模拟信号的给定和回读。系统客户端的软件采用Microsoft Visual C++ 6.0 设计。该综合报警平台具有结构简单、响应速度快、稳定性好等优点,可实现单板对多种不同设备的控制与监测。A system of a comprehensive alarming platform based on MSP430F169 (a mixed signal microcontroller) and EPM1270T144C5N(a complex programmable logic device -CPLD) has been introduced in this paper. The system has the advantages of ultra-low power consumption, powerful processing ability and operating stably by using the MSP430F169. Meanwhile the EPM1270T144C5N is one of the complex programmable logic device which has 144 pins, and it was controlled by MSP430 to output or input the digital signals. The control system is charge for responding the alarming information from the scattered monitoring system which has running on the HIRFL-CSR. The duty of this system is to receive the commands which have been analyzed by server. The12-bit ADC and DAC module in the MSP430F169 can also read back the voltage of device or set the voltage to the specific device. The system’s client software is designed in the Microsoft Visual C++ 6.0 environment. The system has the advantage of a simple structure, fast response, good stability, and is able to monitor different running systems and devices in real time on one board.