| Aluminum is one kind of the most commonly used metals and an important basic raw material for our country's economy development. Since Charles Martin Hall from the USA and Paul Louis Heroult from the France invented the electrolysis technics to produce aluminum at the same time in 1886, Aluminum-electrolysis technology has been developed rapidly, but the temperature measurement of Aluminum-electrolysis trough is still using the technology of continuous measurement., which is very behindhand, wastes manpower and material resources but low effects, This technique also harms worker's body health and couldn't measure hidden trouble in time. So it's cry for realize automatically, continuously and real-time measurement to the Aluminum-electrolysis trough's temperature.In this paper, the fiber Bragg grating's basic configuration, appling actuality and the research and application's actuality of the FBG high temperature sensors were introduced. Then the theory model of fiber Bragg grating was discussed and a temperature model which is based on coupling model theory was deduced. The fiber Bragg grating sensor has many advantages such as small volume, high sensitive, steady, re-electromagnetically, be prone to composing distributed measure system etc. Contrast several high temperature measure techniques commonly used presently. Develop a system that could measure the Aluminum-electrolysis trough's temperature automatically, continuously and real-time, it's based on the fiber grating sensing technology. This project's research and actualization would fill up the domestic blankness, provide a techno-instrument to measure the aluminum electro-bath's temperature, and avoid occuring accident in time.The investigation of the technical scheme's feasibility and the work of basic research, design have taken a whole year. On the basis of the temperature points' measure requests in the plants Yankuang Ke-Ao Aluminum Ltd, the paper optimally designs the integrated wiring system, the sensor package and on-site installation, the various parts of optical signal transmission system, then discusses in detail and proves the feasibility of system design from optical power loss and technical requirements for WDM. A measuring high-temperature experiment using FBG temperature sensors had been done, temperature calibration platform was founded and a detailed analysis of experimental data was carried out.The software system of the project contains LabVIEW data acquisition system, terminal monitoring and control system software, SQL databases. Demodulating procedure is quadratic designed based on the sm125's primary procedure, joined the optical switch's automatic control procedure. The system achieves over-temperature warning and alarm by setting a threshold, and has sound and light alarm device. The system can achieve continuous measurement, recording, display and query historical data for a specific temperature point according to the necessary of the site.Through the system running at the scene, we inform that FBG sensor for temperature measurement is not only timely observation of the temperature changes, but also an analysis of the response to Aluminum-electrolysis trough through the continuous record of temperature changes in trend. The system has played an important role for the safe yielding. |
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