Design and development of a synchronized operation control system for Thomson scattering diagnostic on J-TEXT

A Thomson scattering diagnostic system is under construction at the Joint Texas Experimental Tokamak (J-TEXT).A 1064 nm Nd:YAG laser with 50 Hz repetition rate is used as the laser source.We have used a software for careful and precise control of the laser through serial communication.A time sequence operating system has been developed to synchronize the laser control and data acquisition system with the central control system (CSS).The system operates commands from the CSS of J-TEXT and generates triggers for the laser and data acquisition system in the proper sequence.It also measures an asynchronous time value that is needed for accurate time stamping.All functions are served by a field-programmable gate array development platform that is suitable for high-speed data and signal processing applications.Several embedded peripherals,including Ethernet and USB 2.0,provide communication with the CSS and the server.     

风速对钢心铝绞线红外测温图像质量影响研究

对钢心铝绞线进行红外热巡检时，红外热像图成像质量会因环境风速不同而变化。为研究钢心铝绞线红外测温时，不同载流量下热像图成像质量与风速的关系，本文利用传热学原理，分析了钢心铝绞线表面辐射及红外热像测温模型，提出应用于钢心铝绞线表面的红外对比度表达式及其影响因素。在实验室对LGJ-240/30型钢心铝绞线施加风速为0.5～5.0 m/s、电流为240～600 A,通过实验数据绘制三维散点图并拟合，得到对比度与风速、载流量的表达式，并提出利于肉眼观察的“临界对比度”。最后通过设计野外自然实验，验证实验室结果的准确性及可行性。结果表明，实验室得到的对比度表达式与临界值可以有效判断特定条件下，钢心铝绞线红外热像图质量优劣，对架空输电线路红外热巡检工程具有指导意义。