Optical fiber vibration interference signal real-time data acquisition and transmission device and application thereof

Abstract

The invention belongs to the field of optical fiber sensing, relates to the technology of high-speed data acquisition and provides a large-data-size optical fiber vibration interference signal real-time data acquisition and transmission device for a distributed optical fiber vibration sensing system and application of the device. The device is characterized by comprising an ultra-narrow line-width laser device, light modulator, a light amplifier, a circulator, a sensing optical fiber, a filter, a photoelectric detector, an acquisition and transmission device and a PC. The device has the advantages that a PCIE interface is adopted for communication with a host, and the defect that a traditional acquisition device is low in communication speed is overcome; a digital signal processing module is adopted to inhibit noise in acquired data, and the signal-to-noise ratio of the acquisition device is increased; a DDR III storage is adopted, and large-scale real-time data acquisition can be achieved.

Description

technical field [0001] The invention belongs to the field of optical fiber sensing, relates to high-speed data acquisition technology, and relates to a large data volume and real-time optical fiber vibration interference signal real-time data acquisition and transmission device for a distributed optical fiber vibration sensing system and its application. Background technique [0002] The distributed optical fiber sensing system uses the entire optical fiber as the sensing element, and uses the scattering phenomenon in the optical fiber to realize continuous distributed measurement of the physical quantity to be measured on the sensing optical fiber. When the fiber is subjected to stress, the length of the fiber (strain effect), the diameter of the fiber core (Poisson effect), and the refractive index of the fiber core (photoelastic effect) will all change, and these changes will lead to changes in the phase of light waves in the fiber. The distributed optical fiber sensing s...

AI Technical Summary

Problems solved by technology

[0004] The change law of the interference signal in the acquisition fiber is the basis for judging the external interference behavior. The duration of the information volume and the speed of transmission directly affect the background analysis. Therefore, to accurately and accurately analyze the signal and perform pattern recognition, a high-speed , Real-time signal acquisition device, the traditional optical fiber vibration sensing system usually uses the common acquisition card on the market, such acquisition card generally has the following disadvantages: (1) The transmission speed is slow; (2) The capacity of the storage unit is small, and it cannot store a large amount of On-site data, which limits the system's measurement capabilities and real-time data acquisition and transmission capabilities

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