Designing And Realizing Scattering-Light Turbiditor

Many unsoluble substances generate water turbidity. When there are unsoluble or scatter substances in the water, measuring water turbidity through measuring the intensity of scattering-light. The scattering-light effect is a kind of liquid peculiarity that can measure water turbidity.According to International Organization for Standardization(ISO) ISO07027,measuring water turbidity by means of the optical turbiditonone is scattering-light measurement,suitable for low turbidity water (for example drinking water),according the difference of turbiditor designing,suitable for the measurement of high turbidity water. The other is transmission-light measurement, suitable for measuring high turbidity water (for example waste water and sewage). Soluble and absorbing-light substances can affect the measurement of turbidity (for example colorful substances). When wavelength greater than 800nm, can decrease these effect. In the range of the wavelength ,some blue waste water and blisters will little affect turbidity measurement, these disturbances can be decreased the least degree through careful treating the water specimens. The water specimens including soluble substances only wane light which cut through it. However, the water specimens including unsoluble substances not only wane incidence-light but also generate some scattering-light on difference orientations because of unsoluble particles in it. Incidence-light wavelength decides scatter-light intensity, measuring angle and the shape of suspended particles in the water, optical peculiarity and particle's distribution.With the development of instruments along with the orientation of intelligent, embedded system technology has applied in more fields than ever. Meanwhile,water-quality(drinking water especially) has been paid more attention with the improving of people' living standard. water turbidity is a important index. From the aspect of sanitation, decreasing water turbidity has many benefits with people health.In view of these cases, using the embedded system technology,microprocessor technology and intelligent instrument technology, the paper does research on the hardware and software of turbiditor, design and realize new turbiditor which can be more true of production and living, can be used in wide scope water turbidity measurement,the system has good linearity and high sensitivity.The paper introduces the classification of turbiditor: using the ATmega16 microprocessor (called MCU abroad), produced by ATMEL Company, because of its ultra low-power, it runs faster and extends the life of the battery. The paper briefly introduces sorts, working principle, status, importance of the design and the broad application prospects about turbiditor. The paper depicts carefully software,hardware design, water specimen pool, electrical and optical system, operational amplifier circuit, blisters , color and organic substances disturbed treatment about the turbiditor, provides the debugging process and the results.On the basis of the large number of projects completed preliminary tests, the paper summarizes the feasibility and reliability about scattering-light turbiditor.