Real-Time Monitoring System For Current Annealing Of Fe Based Amorphous Material

The research and use of new materials are the foundation of social development. And it is the ladder of human civilization progressing. As the "young" metal material, Fe-based amorphous material, it has been widely used in target detection and tracking, magnetic marking and labeling, geomagnetic field measuring, etc. In order to better serve the production life, it is necessary to further enhance its performance. However, how to improve has been a problem to us. Since the current measuring method is still stuck in the past methods, it can only observe the final data, rather than the process, thus leading to not know how to control. To change this situation, it is need the promotion of research methods, insight into the process, grasp the process of change, and ultimately enable them to play a role better. For the above purpose, this paper will provide an experimental platform to observe some of its parameters.With the progress of science and technology, automation and intelligent control have been widely accepted by people. They can not only record the objective data and display it in real-time, but also can make the appropriate adjustments according to the experimental condition. Redisplaying the historical data is more convenient. Based on this, an automatic real-time monitoring system is designed on the basis of the current annealing experiment for Fe-based amorphous metal. According to the experiments of current annealing in situ monitoring, it needs to measure the following three parameters, elongation, current and voltage of the ribbon. Therefore the designed system consists of displacement measuring device, current voltage measurement device and friendly user interface. The main contents of this thesis are as following shows.First, sensitive materials for the displacement sensor have been researched, only with excellent properties can achieve better results. We study the giant magneto impedance(GMI) of Fe-based amorphous material effects under different current and components. After test and adjustment, we finally find that the material FeCoNbSiB can obtain the best GMI ratio(1138%) under the condition of current density is 31 A/mm2.Second, two displacement sensor based on Fe based amorphous material have been researched, and the results are(1) Range of displacement sensor based on giant magneto impedance effect is 10mm, the sensitivity is 32 μm, the maximum repeatability error is 0.2973%, and the maximum hysteresis error is 0.6526%.(2) Range of displacement sensor based on inductive effect is 3mm, the sensitivity is 7μm, the maximum repeatability error is 0.4508%, and the maximum hysteresis error is 1.8034%.Third, the real-time monitoring system for current annealing of Fe-based amorphous material is researched. Displacement of this system is measured by the device which is fabricated by Fe base amorphous thin strip.The measurement of current is through LT6105 current monitoring chip, and its precision can reach 1 mA and its range is 2A. Voltage is obtained by using the method of resistance partial pressure (need to test maxim voltage is 0-20V), and using op-amp opa2344 which is made by TI company as a voltage follow chip. Under the condition of the above three parameters can be measured, analog information is converted into digital signals through the data acquisition card. We use LabVIEW to real-time display and save data by computer. Through the experimental debugging, the system can meet the requirements of the experiment.