Design And Experiment Of Self-check System For Multi-parameter Water Quality Detector Based On Micro Spectrometer

The protection and improvement of water resource has gotten high attention from countries around the world. Water quality detection, a basic method for the protection and governance of water resource, is an important technology to reflect the status of water in a real-time, quick, accurate and round way. Multi-parameter water quality detector based on spectroscopy analysis technology has the noteworthy advantages like multiple parameters, fast, relatively small volume and so on. It is one of the important development directions of modern water quality detection technology. This thesis focused on the problems always happened during the operation of multi-parameter water quality detector developed by the lab, carried on the research related to the self-check system of the instrument, is of great significant for the practical application of the instrument.This thesis was based on the requirements of practical application from multiparameter water quality detector, aimed at the problems caused by the lack of self-check system for multi-parameter water quality detector which was developed by the laboratory, carried on the design and experiment of self-check system for multi-parameter water quality detector based on ARM control center. After analyzing the application situations and development trends of the self-check technology applied in water quality detector instruments at home and abroad, this thesis deep analyzed the structure and the principles of the multi-parameter water quality detector developed by the laboratory and proposed the general design scheme of self-check system which could be applied to multiparameter water quality detector. Then, this thesis finished the design and research work of self-check functions for optical system, flow path system, sample reaction and detection chamber system and quality control part. Last but not least, this thesis finished the debug of every function module for self-check system, carried on the water quality testing of Cr6+. The experimental results show that: This multi-parameter water quality detector self-check system basically realized the self-check functions of optical system, flow path system, sample reaction and detection chamber system, satisfied the practical application requirement of water quality detector.The main research work of this thesis is:(1) Deep analyzed the present research situations and development trends of selfcheck technology applied to water quality detection instruments at home and abroad. Based on the features of multi-parameter water quality detector developed by the laboratory, the thesis put forward the research proposal of multi-parameter water quality detector self-check system.(2) Analyzed the structure and principle of multi-parameter water quality detector, then from many aspects like optical system, flow path system, sample reaction detection chamber system, human-computer interaction system and quality control, deep analyzed various problems caused by the lack of self-check function, put forward the design requirement of self-check system.(3) Based on the water parameters test processes and routine maintenance methods, put forward the overall design scheme of multi-parameter water quality detector selfcheck system applied to multi-parameter water quality detector system. Finished the design of soft- and hardware to realize the self-check functions of optical system, flow path system sample reaction and detection chamber system and the quality control part. Then based on the hardware and software system of the pre-developed instrument, designed the database, graphical user interface and fault alarm code table, completed the whole design of multi-parameter water quality detector self-check system.(4) After verifying every function of each module for self-check system, conducted the sample room cleaning self-check experiments, six chromium building standard curve testing and quality control test experiments. The experiments proved that, this multiparameter water quality detector self-check system can ensure the safety and stability of operation for the instrument, basically satisfied the practical application requirement of the multi-parameter water quality detector.