Intensity coding type fiber grating temperature monitoring and alarming system
A fiber grating and alarm system technology, applied to thermometers, thermometers with physical/chemical changes, measuring devices, etc., can solve problems such as inability to change temperature or locate alarm points, and inability to distinguish fiber gratings, etc., to achieve cost-saving effects
Inactive Publication Date: 2011-08-10
杭州光佑科技有限公司
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However, since the system cannot identify the specific fiber grating in the link, it can only monitor whether there is an abnormal temperature in a section where multiple fiber gratings are distributed at the same time, but cannot locate the temperature change or the alarm point
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[0013] A fiber grating with a gradient change in reflectivity and the same reflection wavelength is fabricated in an optical fiber by a special method. The reflectivity interval of each fiber grating can be determined according to the resolution accuracy of the signal detection system, the number of fiber gratings that need to be connected in series, and other factors. The difference in reflection wavelength value between each fiber grating is determined by the allowable error in actual monitoring.
[0014] Install the prepared fiber gratings at the actual location that needs to be monitored, connect the fiber gratings in series with optical fibers, and connect them to the combining port of the Y-shaped optical splitter, and the two splitting ports of the Y-shaped optical splitter The broadband light source and the adjustable filter are respectively connected by optical fiber, the filter output end of the adjustable filter is connected to the optical detector through the optic...
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The invention relates to an intensity coding type fiber grating temperature monitoring and alarming system, belonging to the technical field of optical fiber sensing. The system comprises a broadband light source, a Y-shaped optical branching device, a fiber grating, a tunable fiber, an optical detector, a corresponding fiber and a lead wire and can be used for temperature monitoring and fire alarming, wherein the reflective wavelengths of the fiber grating are identical even the gradient change of reflectivity. The system not only keeps the advantage of low cost of an identical fiber grating temperature monitoring and alarming system in an intensity coding mode of reflected signals, but also avoids the shortcoming that the identical fiber grating temperature monitoring and alarming system can not specifically locate the fiber grating; and the intensity coding type fiber grating temperature monitoring and alarming system can locate which fiber grating in a monitoring region changes in temperature or which fiber grating in the monitoring region gives out an alarm signal when the temperature changes greatly and the alarm happens, so as to have more advantages. The temperature of monitoring and alarming in the intensity coding type fiber grating temperature monitoring and alarming system is usually below 200 DEG C; and if special materials or the processed fiber grating is used, the highest monitoring temperature can reach 500 DEG C.
Description
technical field [0001] The invention belongs to the technical field of optical fiber sensing, and is a novel optical fiber grating multi-point temperature simultaneous monitoring and alarming system. Background technique [0002] In petroleum, chemical, natural gas, energy and other industries, temperature monitoring is extremely important. Sometimes excessive temperature will cause accidents such as combustion and explosion, resulting in loss of life and property. Therefore, the real-time monitoring technology of temperature has great application demands. [0003] Traditional temperature monitoring technologies are mostly based on electromagnetic sensor systems, which are unsafe when used in flammable and explosive occasions, and are easily interfered by external factors such as electromagnetic waves and humidity. The temperature monitoring system made of fiber grating has the advantages of intrinsic safety, anti-electromagnetic interference, anti-humidity, anti-corrosion,...
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IPC IPC(8): G01K11/32G01K11/3206
Inventor 董新永杨樟成徐汉锋
Owner 杭州光佑科技有限公司