| Laser induced plasma breakdown spectroscopy (laser induced breakdown spectroscopy, LIBS) technology is an offline and efficient component quantitative analysis technology, which is applied to the material after using a laser, a plasma surface-emitting substance, along with the plasma generation will there are emission spectra, by the emission spectra to analyze the composition of materials. Because its technology has the advantage of not requiring pre-prepared test samples of solid, liquid, gas and other substances can be analyzed directly, has now been widely used in various aspects. Because the technology is the application of photovoltaic technology it is possible to destroy the samples near zero measure, measure the distance can be very far, very fast and the measurement accuracy is very good, in the metallurgical industry by everyone of all ages.Smelting site harsh environment, high temperature, dust, melt surface was influenced by the application of LIBS technique slag coverage and other factors, so the design and studies can be used in high temperature melt-line monitoring of immersion detection system is very necessary. According to this demand, a study designed and capable of automatic focus, automatic temperature control immersion detection systems, internal measurements directly immersed in the melt. The system configuration of a probe can effectively cut off from external negative factors of high temperature, dust, etc. on the LIPS measurement system; through the use of internal probes into the single cold gas, multi-temperature chamber closed loop temperature control and insulation and other measures to control the internal probe stable at room temperature requirements; using precision screw drive mechanism with a laser ranging system consisting of quick focus adjustment system; using precision screw mechanism with precise composition spectrometer focal length adjustment system; solve the LIBS technique for high temperature furnace body of the molten metal component line detection a series of key technologies.1. In this paper, the research background first are described, as well as the status of development of the metallurgical industry are introduced, then the principle of LIBS and industrial applications makes the introduction, given the molten metal detector at home and abroad has been used in practice and pointed out its problems and ideas for improvement;2. For optical path of the probe at room temperature and the static error analysis, we deduce the error is calculated as a probe of processing to provide a theoretical guidance;3. Immersion detection system design, having designed to prevent heat radiation and heat conduction probe chamber, a single design multi-temperature cold gas chamber cooling circuit structure, designed by the precision screw, laser rangefinder and Spectrometer consisting of coarse and fine focus adjustment mechanism designed LIPS light path outside the system as a whole restructuring. The detection system submerged structure composed of metal components to ensure the LIPS online testing technology needs of high temperature melting.4. Following that is a part of the probe tube steady stress and strain at 200℃ analysis, research in the lens barrel to focus on the issue of stress at a given temperature and deformation, and the deformation according to the displacement data obtained by simulation using the second chapter, the error calculation formula for calculating the maximum possible focus due to temperature rise caused by the offset error, and processing to install the probe provides a theoretical analysis and guidance;... |
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