Design of a Modularized Automatic Measurement and Control System for Laser-Induced Breakdown Spectrometer

In order to improve the compatibility of laser-induced breakdown spectroscopy（ LIBS） instrument for different types of parts and optimize the analysis and testing processes,a modularized automatic measurement and control system was developed. Based on the characteristics of each LIBS component, the following development steps have been performed：（ 1） a summary of characteristic parameters of the component are established;（ 2） the integration mechanism of multiple electrical interfaces is designed;（ 3） the component control instruction library is developed. The experimental results indicate that the measurement and control system is compatible with most LIBS parts in the market.Spectrometer and laser can be compatible with at least three different types of parts. In addition,a multilayer iterative testing process is designed to improve the efficiency of optimization process of LIBS parameters. The experimental results have shown that the automatic optimization of the delay time compared to the manual testing provides significant gain in testing efficiency. The range of delay time in the experiments is 1. 28 to 10. 28 μs and the step value is 1,0. 5,0. 2 and 0. 1 μs. The gain in testing efficiency has been found to be increased by 73. 76%,75. 93%,78. 81% and 80. 42%,respectively.     

智能锂电池充电器设计

为解决锂电池的快速充电问题,设计一种具有电压和电流检测功能的智能锂电池充电器系统,并给出了相关单元模块电路及其驱动程序的流程图。该设计以MSP430单片机为控制核心, 对电池进行电压电流采集,通过判断电池所处的充电状态,调整PWM （Pulse Width Modulation)波的占空比,以实现高精度控制充电。实验结果表明,该智能充电器可安全地进行锂电池的快速充电,耗时约1 h,比一般充电器(2~3 h)的充电速度有显著提高,从而有效缩短了锂电池的充电时间。