After the optical lens is finely ground by the abrasive liquid, there is still a crack layer about 2–3m thick on the surface. The method to eliminate this crack layer is polishing. The mechanism of polishing is the same as that of grinding, except that the tool material used is different from slurry. The materials used for polishing include cloth, polyurethane and pitch, which usually require high precision. For the polished surface, the most commonly used material is high-purity polished asphalt.
Using asphalt to polish, the fine surface of asphalt drives the polishing liquid to grind the surface of the lens to generate heat, which makes the glass melt and flow, melt away rough vertices and fill up cracks At the bottom of the valley, the crack layer is gradually removed. At present, the polishing powder used for polishing glass lenses is CeO2 as the main laser focusing lens. The proportion of the polishing liquid varies according to the polishing period of the lens. Generally, a higher concentration of polishing liquid is used in the initial stage of polishing and when clamping with the polishing mold. After the lens surface is bright, use a thinner polishing solution to avoid orange peel on the mirror surface (fogging of the lens surface).
The movement mechanism used for polishing and grinding is the same. In addition to the different polishing tools and working fluids, the environmental conditions required for polishing are also stricter than those used for grinding. The general things to pay attention to when polishing are as follows: There should be no impurities in the surface of the polishing asphalt and the polishing liquid, otherwise it will cause scratches on the mirror. The polished asphalt surface must be consistent with the lens surface, otherwise it will be bounced during polishing, which will bite the polishing powder and scratch the lens surface.
Before polishing, it must be determined whether the surface of the lens is scratched or punctured by the laser protective lens after polishing. Whether the size and material of the polishing tool are appropriate. Whether the hardness and thickness of the asphalt are appropriate. During the polishing process, attention must be paid to the condition and accuracy of the lens surface at all times. In the inspection of lens surface defects, because the inspection process is judged by personal vision and methods, the inspector should have a deep understanding of the specifications of scratches and sand holes, and often compare the standard samples of scratches and sand holes. To ensure the correctness of the inspection.
Although near infrared spectroscopy is not a particularly sensitive analytical technique, it is very suitable for process monitoring, material science and medical treatment due to its feature that it does not require sample pretreatment. And other fields.
Experts believe that the advancement of near-infrared spectroscopy technology is mainly the miniaturization of new imaging systems and instruments.
Pierr laser collimator eDardenne is the department director of the Wallonia Agricultural Research Center in Belgium. He believes that the two major advances in near-infrared technology are hyperspectral imaging and portable instruments. Gary McGeorge, a senior chief scientist at Bristol-myerssquibb (bristol-myerssquibb), agrees with Dardenne's view on the importance of hyperspectral imaging. 'The commercialization and application of imaging spectrometers and hyperspectral imagers is a significant change in the near-infrared field in the past ten years,' he said. 'Imaging technology can give information on the microscopic distribution of ingredients in drugs, in order to further understand the efficacy of the drug. Provide help.'
McGeorge pointed out that these imaging instruments can be used in agriculture and food processing in combination with the optical lenses of machine vision systems in addition to drug analysis. He said: 'If only a few wavelengths are needed for analysis, these imaging systems can get real-time images within a few seconds, which was impossible before.'
BenoitIgne is the chief scientist of GlaxoSmithKline (GSK) and the president of the Council for Near-Infrared Spectroscopy (Council for Near-Infrared Spectroscopy). He believes that the main progress is the miniaturization of the near-infrared system. He said: 'In the past 5-10 years, the most important development of near-infrared is the low-cost, small, special-purpose instruments that exist on the market. They can replace large-scale instruments for Ru0026D, field and production.' BenoitIgne believes that the micro-F optics Lenses T-NIR, MEMS-NIR, and LVF-NIR can be used in the application fields of previous research-grade instruments, such as real-time analysis, online monitoring and process control. He added: 'The low-cost feature of this type of instrument even allows the instrument to be replaced with a new instrument when it fails, rather than repaired. It has the ability to completely subvert the life cycle of traditional instruments.'
makes NIR spectroscopy so interesting, but also the reason why it is difficult to apply it is that NIR spectroscopy is very sensitive to the matrix of the sample. 'He pointed out that unless the established model is carefully and systematically designed and verified, the established model is extremely susceptible to the influence of the sample matrix, such as the particle size, density, humidity and temperature of the sample, and the design and verification of the system usually requires A lot of time, energy and funds.
Shenzhen Wangxinsheng Technology Co., Ltd. is a professional factory that develops and produces high-power laser (laser) lenses, dichroic lenses, laser mirrors, and beam splitters, especially Good at high-power laser fiber cutting machines, protective lenses, focusing lenses, and collimating lenses for laser welding machines, with a power range of 500W-8000W. The factory is located next to the Guanlan Golf Club, Baoan District, Shenzhen, and has an experienced Ru0026D and production team. The equipment includes Taiwan Maijun polishing machine, Korean Era Seiko edging machine, Japanese new Coron coating machine, glass cutting machine, ultrasonic, American LAMBDA950 spectrophotometer (measuring range 175nm-3500nm), interferometer, eccentric meter, etc. It has perfect The production process and professional testing capabilities, rigorous technical process and strict quality management system guarantee the excellence of the quality of optical lenses. http://www.wxsjp.com/