Design Of The Portable Multi-spectrum Fusion Based Water-quality Analyzer

The Analysis over the water organic level is fundamentally crucial both to the detection and control of the pollution level inside a specific water domain. The existing approaches consist of chemical analysis and optical analysis. The former is relatively mature considering the thorough study and high precision level, whilst notorious in the lengthiness of the processing time and the proneness to the secondary pollution. The latter however, is fast in response and secondary-pollution-free as the interested parameters of one water sample are non-intrusively estimated by examining the according spectrum characteristics. Nevertheless, the achievable precision level is comparatively low as the portable water-pollution-level detection apparatus (PWDA) is widely bottlenecked by relevant technologies with respect to the light sources and spectrometers.We, guided by the optical analysis theory, devise a PWDA via the combination of transmission spectrum and emission spectrum which mostly encompasses fluorescence and Raman spectrum. Our work is organized as follows:1. A complete survey on the existing water-pollution-level detection apparatuses together with the underlying state-of-the-art spectrometer technologies is presented. An extensive theoretical research is completed, which is comprised of different spectrometer technologies and related intelligent algorithms adopted in the modeling process.2. An optimal PWDA design scheme is devised through theoretical development and extensive experimental demonstration. Several feasible schemes are put forward and their intrinsic advantages and disadvantages are weighed against each other. Three-dimensional fluorescence and Raman spectrum data, excitated by transmission light and varying emission light wavelengths are obtained, modeled and further analyzed to make high-precision predictions.3. A portable integrated laser source instrument is developed due to the fact that existing ones fail to meet our requirements. It incorporates multiple semiconductor lasers and one solid laser, which are uniquely power supplied and controlled. Its priority lies in the fact that as the light source of the PWDA it is specially designed to realize the digit switching function over different wavelengths and powers. Also, it can be applied and supplementary to other similar scenarios and apparatuses.4. The optimal design of light and circuit, as well as the AutoCAD modeling and simulation of the construction of the apparatus are realized under different requirements.