水冷式积分球功率计

本文介绍了用粗糙面作为漫反射面的水冷式积分球功率计。经标准能量计标定,具有响应时间快(10~(-1)秒)、重复性好(优于1%)、可测激光功率范围大(数瓦—千瓦)等特点。该功率计标定误差小于±5%,测量激光输出时,与国家标准大功率计之差在1%以内

折迭式CO_2激光器各电极电位分析和高压变压器绝缘的加强

对于三程以上的折迭管激光器,只有一台电源低压端可以接地,其他电源必须浮置,此时会出现危险的电位升高.本文分析了电位升高的原因,实测了浮置点的电位值,并提出了改进高压变压器绝缘的方法

GH37合金表面激光熔凝后的显微组织

本文采用1KW横流CO_2激光器研究了在不同激光熔凝和后续热处理条件下GH37合金表层的显微组织特征,为激光快速熔凝技术在沉淀硬化型高温合金中的应用提供了一定的试验依据

Design of optimal PI controller with dead-zone link for low-order processes with time delay

In this paper, a design method of optimal proportional-integral (PI) controller with dead-zone link is presented for low-order processes with time delay. Closed-loop system is the nonlinear control system with the dead-zone link. The feedback system can be equivalently transformed into the linear switch system (LSS) or autonomous switch system (ASS). The optimal control problem is equivalently transformed into nonlinear constraint optimization (NLCO) problem via common Lyapunov functions (CLF) theorem and Lyapunov theorems. Therefore, optimal PI controller can be obtained by solving the NLCO problem. Simulation results show effectiveness and usefulness of theproposed design method