Long distance optical fiber grating sensing and transmitting device

Abstract

The invention relates to a long-distance optical fiber grating sensing transducer. An optical fiber end surface matching fluid container, an optical fiber sensor array, a wavelength division multiplexer, an erbium-doped fiber, an optical isolator are sequentially disposed in the upper part of a mounting plate from left to right, an optical fiber end surface matching fluid is filled in the optical fiber end surface matching fluid container, one end of the optical fiber sensor array is disposed inside the optical fiber end surface matching fluid, the other end of the optical fiber sensor array is connected with one input end of the wavelength division multiplexer via an optical fiber, a pumping laser is disposed in the lower part of the mounting plate, the output end of the pumping laser is connected with the other input end of the wavelength division multiplexer via an optical fiber, the output end of the wavelength division multiplexer is connected with one end of the erbium-doped fiber, and the other end of the erbium-doped fiber is connected with one end of the optical isolator with an optical fiber. The invention has the advantages of high signal-to-noise ratio, wide detection range, high resolution and measurement accuracy, long transmission distance, good reliability, and low production cost; and can be used for long-distance detection of temperature, pressure, pipeline deformation strain in oil and gas pipelines.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing systems, and in particular relates to a device for performing multi-point distributed detection on external information to be measured, such as pressure and temperature, by means of an optical fiber grating, which is converted and transmitted remotely. Background technique [0002] As a sensing and measuring device with an intelligent structure, fiber gratings have the advantages of small size, light weight, corrosion resistance, anti-electromagnetic interference, easy integration, and simple structure. Stress, pipeline deformation strain, flow velocity, flow rate, viscosity and other physical quantities are detected. Since its appearance in the 1970s, it has received widespread attention at home and abroad. Since fiber grating sensing is to modulate the information to be measured to the wavelength of its narrow linewidth reflected light, how to completely and undistortly transmit t...

AI Technical Summary

Problems solved by technology

With the development of multi-point distributed sensing technology and the needs of long-distance transmission systems, the method of using light sources to provide broadband light sources to sensors through couplers can no longer meet the needs of practical applications. This traditional mode uses sensors and light sources separately. Its main disadvantage is that there are several stages of couplers between the light source and the sensor, so that the output power of the light source is reduced in series, and the light energy reaching the fiber grating sensor is very little; secondly, the signal-to-noise ratio of the generated optical signal is low, and the noise interference is serious ; In addition, multiple relay amplifiers are required in the long-distance optical signal transmission process, thus greatly increasing the cost of the entire system

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