水质快速检测设备的硬软件设计及实现

Hardware and Software Design for Water Rapid Testing Equipment and Experiment

[目的]研制水质快速检测设备,实现水质的现场多指标快速检测。[方法]对设备的硬件及软件进行了设计。硬件设计包含了MP2303芯片、锂电,Cortex-M3型ARM微控制器、树莓派显示系统、光频转换器等的设计;软件设计则包含了软件设置、项目选项、项目测量结果以及测量数据表格输出等模块的设计;并对水质快速检测设备的可靠性进行了试验检验。[结果]通过对该设计的设备硬件和软件合理搭配连接,从而研发出了水质快速检测设备。用该设备与国家标准要求的设备同时测定某一河道水样的5项指标结果发现,3个样点水样中铁、氨态氮、氟化物、硝酸盐和6价铬含量的两组数据值接近,无明显差异。虽然国家标准法检测下限比快测法高一个数量级,但快速设备的测定结果不影响操作员对水质的判断,说明该水质快速检测设备精密度高;两种测定方法的稳定性比较,结果快速测定法的5个指标数据的相对偏差略高于国家标准法(3.92%),但其测定结果能够较好地满足现场测定要求,说明该水质快速检测设备稳定性良好。[结论]该水质快速检测设备的检测精度和稳定性较高,可满足水质的现场快速检测要求。

[ Objective] Water rapid testing equipment can be used to detect water quality indexes within a very short time. [ Method] Equipment design including hardware and software design was described. The former consists of MP2303 chip, lithium battery, Cortex-M3 ARM micro-controUer, Raspberry pie display system and light-to-frequency converter etc.. The latter consists of software setting, project option and testing data outputting etc.. Then the reliability of the rapid testing equipment was tested. [ Result] Through appropriate connection of hardware and software, water quality rapid testing equipment was developed. The iron, ammonia nitrogen, fluoride, nitrate and 6 valence chromium content in three samples were compared, it was found that two groups of data have no obvious differences. Detection limit of national standard method is about one order of magnitude higher than fast measurement, but rapid equipment determination results does not affect the judgments of the operator on the water quality, which indicates the water quality quick detection device has high precision; The relative deviation of the 5 indexes of rapid determination method is slightly higher than the national standard method（3. 929% ）, but the result can satisfy the requirement of the field test, which shows that the water quality quick detection device has good stability. [ Conclusion] The equipment presents high testing accuracy and good stability, which meet the requirements of on-site water quality rapid testing.