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Due to the complicated process and the large number of products, the metallurgical industry is prone to mixing and mixing. How to solve this problem has long plagued metallurgy and other industries. As early as the early 1980s, due to the development of optical fiber technology, it provided an opportunity to solve this problem completely. Mobile photoelectric direct reading spectrometer came into being. The mobile direct reading spectrometer is equipped with a wheel for the spectrometer to minimize the volume and weight of the entire spectrometer. The detection is performed by a spectral excitation gun. The excitation gun is connected to the host by optical fiber and cable, and the intermediate distance can reach 5-10m. Due to the flexibility of the optical fiber, it can be flexibly used for material identification in the finished product warehouse or other production sites. Early products only had an arc source, which could analyze all metal elements such as silicon and manganese in metal materials. This product was soon applied to metallurgy, petrochemical, mechanical processing and other industries.
For some time, China has been slow to develop in this field. There are two reasons for this: on the one hand, mobile spectrometers are cheaper than laboratory spectrometers, but they are still expensive for mixing and mixing. On the other hand, China's main product is Pugang, and the early mobile spectrometer could not analyze carbon due to the use of optical fiber to guide light. Of course, it could not analyze phosphorus and sulfur. Therefore, the early mobile spectrometer has great limitations in China.
Since the 1990s, mobile spectrometer analysis technology has developed rapidly. Now carbon, phosphorus and sulfur can be correctly analyzed on mobile spectrometers. It is realized by two different technologies. Early optical fibers had a significant absorption of lines below 200 nm, so carbon, phosphorus, and sulfur could not be analyzed. Modern special optical fibers have been able to greatly reduce the absorption rate of carbon (193.09 nm), and the carbon content can be identified and distinguished at a concentration above 0.02%. However, this method still cannot analyze phosphorus and sulfur. Another method is to make a small light chamber for carbon, phosphorus and sulfur, and fix it to the excitation gun. The light chamber is a hydrogen atmosphere, so that the light excited by the excitation gun propagates through two paths, and all the way through the optical fiber to 5m. The main optical system, the other way is directly transmitted to the small light chamber on the excitation gun. The small light chamber has nitrogen protection and does not absorb ultraviolet light. Therefore, carbon, phosphorus and sulfur can be measured. This greatly expands the field of use of mobile spectrometers. .
At present, the application technology of mobile spectrometers in China is developing rapidly, and the mobile spectrometers used in various industries are estimated to be more than 100. In order to meet the needs of production, a fully automated spectrum inspection vehicle was introduced on the market. China Baosteel has two sets of fully automatic spectrum detection vehicles applied to the steel pipe production line and realized online analysis. Its working process is: when the steel pipe passes through the specified measurement area of ​​the spectrum inspection vehicle on the production line, the grinding sample device automatically polishes the surface of the steel pipe from the bottom up, and the excitation gun pushes the steel pipe from the bottom to the excitation measurement, and the average of the two measurements is averaged. If the qualified steel pipe passes, if it is unqualified, it will be hoisted to the designated place outside the production line by the boom.
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