Research On New Style Online Detection Of Oil In Water Emulsions

Nowadays, overproof discharge of waste water not only pollute aquatic environment, but also threaten soil condition, aquicolous resource and people's habitat. Although industry department constituted strict regulations, existing detecting method of oil in water emulsion can not meet the demands of real time and precision. So the dissertation researched on new style online detection of oil in water emulsions. It used photoelectric technology to detect. It based on theory of near infrared light absorption and had high performance of real time and accuracy. At first, the dissertation pointed out some merit and shortcoming of existing measurement of oil in water through analysis and compared their various performances. Then, it suggested detecting oil using NIR spectrum. The Law of light absorption and the generating mechanism of NIR spectrum were explained briefly to help us comprehend the NIR technology deeply. The dissertation described issue of choose wavelength and the design process of new style detection, such as choice of wavelength, modulation of optical flux, design for circuit of lighting device, load analyses of lighting acceptor. These can offer technical reference for similar research. The dissertation also discussed hardware implementation of new method. AC coupling method was used in design. Compared with DC coupling signal processing, it need lower requirement of signal processing circuit and have the merit of high signal-to-noise performance although it require the device of modem. Later, this paper introduced the design of digital circuit and software that used in detection system. Finally, experiment results have been given and validated the design. Then, summary have been given at the end of this dissertation and hope to beneficial to other engineer.