The Optical Fiber Sensing Safety Supervisory System

The oil tank which store oil product is the important equipment that is widely used in the Sinopec, preservation, transportation and so on to store the flammable and explosive oil material , which need the exceedingly high secure demand , but the examination of the main parameter of the oil tank -- oil storage fluid is always a technique difficulty.Aimed at the present status of detecting oil storage fluid, the article advances a method which utilizes the dramatic feature of optical fiber sensor to develop the optical fiber liquid height meter , and to substitute the manual examination means , and supplements the optical fiber liquid overhead alarm equipment , the optical fiber grating temperature sensor , and uses the network technique to build the optical fiber sensing safety supervisory system to realize the intelligent examination of Oil-tank Area , thereby avoids or decreases occurrence and the risk of accident , and supplies the reliable guarantee for the big-and-middle-sized tank farm safe production.Firstly the work principle and distinguishing feature of the kernel hardware - optical fiber liquid height meter are introduced in the safety supervision system. In nature, the optical fiber liquid height meter is one kind of the optical fiber fluid sensor, and it sufficiently utilizes the principle of the optical fiber sensor, making the examination field no signal of electricity, attaining completely an area no electricity examine, and making the safety supervision system essentially secure explosion proof.In this paper we take Microsoft Windows NT4. 0 as operating system, take Microsoft Excel2000 as the data administration system to realize data exchange and the report function; take Microsoft Visual Basic 6.0 as the data link system to realize the communication of the optical fiber liquid height meter with the RS-232 of the work controlling machine; take generalsupervision system MCGS as systematic configuration software to realize the configuration function of supervision appearance. These four sections constitute the software terrace of the optical fiber sensing safety supervisory system.In the aspect of building network, we take the star topology as the network topology-structure, take TCP/IP widely used as the network protocol, take the super 5 types no shields twisted pair and glass fibers as the network transmission media, and adopt the Ethernet technology as the LAN building network scheme.In the aspect of the systematic software section, we discuss the dynamic link library in detail, the relationships between dynamic link library and static state link library, dynamic link library and application program, and the establishment and call of dynamic link library.Then we discuss how to develop the equipment driver using the configuration software MCGS, and introduce a method to develop the equipment driver quickly, this is, firstly to utilize the develop wizard to form the frame, afterwards to transplant by means of the sample program.In the paper, we finally introduce the function of the fiber optic sensing safety supervisory system, display the operation effect of the system; moreover, we sum up the full text and put forward the outlook of the work of the next step.