便携式氯离子检测仪的设计

工业用水中氯离子含量过高会加速对金属设备的腐蚀作用，为快速准确测量工业用水中的氯离子浓度，本文基于硝酸银浊度法，设计了一种散射式氯离子检测装置。硬件结构主要包含光源驱动电路，光束准直结构以及以Atmega128为处理器，PIN光电二极管实现光电转换，低噪声放大器 AD795实现电流到电压信号变换的光电流处理电路。通过对氯离子标准液进行测量，其结果表明，仪器短时间内可保持良好的稳定性，测试结果相对误差小于4.08％，表明此方案有良好的应用价值。

The design of the portable chloride ion detector

High content of chloride ions in industrial water will accelerate the corrosion of metal equipment , A Scattering light measuring instrument which based on silver nitrate turbidimetry is used for Chloride ion detection quickly and accurately .The hardware part of the system—including the light source driving circuit ,the structure beam collimation and optical current signal detection module which used Atmega128 as processor ,with the use of an PIN photodetector to realize photoelectric conversion and use of a low‐noise amplifier AD795 to realize current‐to‐voltage conversion .By measuring the standard solution ,We can conclusion that it has a good stability in short time and the relative error less than 4 .08% .It is proved that this scheme has good application value .