PH Value And Chloirde Ion Detection System Research Based On Color Sensing

Formation water PH and mineral degree detection (mineral degree mainly refers to thechloride ion detection) not only can be used to judge the well out of the water layer and analysisof the underground geological situation, the analysis of oil (gas) storage conditions, can alsounderstand the groundwater movement and distribution, efficient search for and develop oil andgas field has important significance. Rely mainly on laboratory testing for formation water atpresent such as conventional analysis methods, such as Moore’s law, colorimetric method,potential analysis, etc., formation water is bad for the researchers in the field of exploration forreal-time data acquisition and analysis. In view of the situation of formation water detection, thispaper presents a test method based on color sensors detect formation water PH and chlorine ionconcentration detection method, after fully considering the field for testing instrument is portable,simple operation, accurate, save electricity, etc., application of low-power chips, completed thedesign of the detector, do the following work:1. After compareing the detection of the PH and chlorine ion concentration methods, putsforward the test to detect and, by using the method of ’digital’ identification paper color analysisand research for the realization of technical problems of this method.2. Based on the color and PH test paper and test method of chlorine ion test paper colorrange of the study, the color detection method of spectral detection range is determined. Throughanalysis and research to commonly used color space, choose RGB color space, and complete theconstruction of the entire system diagram, and puts forward the key problems need to be solved,such as environmental impact factors, the choice of light path diagram, light stability, detectiondistance, curve, etc.3. Through the study of color sensor types, choose TCS3200color acquisition sensor forinstrument, its internal integration of the filter will be input in the light of RGB color singlequantity into the separation, and through the MCU read their strength. Correction of color sensorcalibration method, matrix method and the white balance method of comparison, choose thewhite balance correction method for sensor calibration. Scaffolding system, use the color sensorfor the scheme is feasible and accuracy analysis provides an important research means, such asambient temperature, test paper detection distance, light stability and so on has carried on theexperimental analysis and validation.4. Experimental research on the degree of color detection on curve analysis method,according to color collection of parameters for the RGB (red, green and blue) three variables,belongs to the multidimensional space data fitting problem, the PH value of three variablescorresponding to the scatter plot analysis, and through the separation factor of single factorregression analysis, multiple regression analysis, factor analysis and nonlinear regression and neural network algorithm, to find the chlorine ion concentration and PH value or a mathematicalrelationship between the component of the RGB color. Experiments prove that the PH of theexperimental data of BP neural network is applied to forecast the result accord with actual valuedegree is better; And the fitting result of chloride ion is not very good, comprehensive analysisusing least absolute value as the chloride ion detection algorithm look-up table method, make theprecision of the testing requirements.5. Respectively on the basis of previous research, for color acquisition sensor, hardwarecircuit, color detection and quantification system and system software for detailed design, andthe experimental verification system.Experimental results show that the proposed detection method and the design of test systemcan meet the test requirements, has practical value. This method can be applied to variousindustries need a water test.