Distributed optical fiber temperature measurement online calibration device and method

Abstract

The invention relates to a distributed optical fiber temperature measurement online calibration device. The device is characterized by comprising a temperature control module, a circulation module anda hollow circular tube; the two ends of the circular tube are provided with plugs, the plugs are provided with optical fiber outlets allowing an optical fiber to stretch out, the circular tube is ofa vertically opened and closed structure composed of an upper half tube and a lower half tube, one sides of the upper half tube and lower half tube are connected through a hinge or a hinge chain, andthe other sides are provided with split-half openings. The distributed optical fiber temperature measurement online calibration device has the advantages that 1, the length splicing of the device is free, the device can adapt to the distribution of different temperature measurement precisions to achieve a temperature measurement host; 2, the device is a straight tube type, and can be well appliedto the calibration of the actual cable temperature measurement; 3, the device can be convenient to move, portable and convenient to carry by people; 4, the device can achieve high-precision temperature calibration in the field and improve the temperature measurement precision of the distributed optical fiber temperature measurement host.

Description

technical field [0001] The invention relates to the field of cable temperature measurement of comprehensive pipe galleries and cable tunnels, in particular to the temperature calibration of cable temperature measurement based on distributed optical fibers. Background technique [0002] The temperature of a power cable is an important parameter that reflects its operating state. By measuring and monitoring the surface temperature of the cable, we can fully understand its insulation aging, evaluate its working state, and find faults and hidden dangers in time. With the development of China's optical fiber sensor With the continuous development of the field, due to the characteristics of distributed optical fiber temperature measurement, long measurement distance, high temperature measurement accuracy, and low laying cost, it is widely used in the field of cable temperature measurement at this stage. The corresponding technical specifications require that the optical fiber for ...

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Problems solved by technology

[0002] The temperature of a power cable is an important parameter that reflects its operating state. By measuring and monitoring the surface temperature of the cable, we can fully understand its insulation aging, evaluate its working state, and find faults and hidden dangers in time. With the development of China's optical fiber sensor With the continuous development of the field, due to the characteristics of distributed optical fiber temperature measurement, long measurement distance, high temperature measurement accuracy, and low laying cost, it is widely used in the field of cable temperature measurement at this stage. The corresponding technical specifications require that the optical fiber for cable temperature measurement must be laid close to the cable. After the laying is completed, the temperature needs to be calibrated according to the actual temperature in the tunnel. The traditional calibration method uses methods such as infrared temperature measurement or thermometers to detect the actual temperature in the tunnel. , to get the temperature of the cable. This method is not accurate in temperature measurement. The main problem is that the corresponding temperature point cannot be well determined. The personnel can only obtain the approximate distance point based on experience and perform temperature calibration. This method will The temperature of the calibration is inaccurate, which directly leads to a large error in the temperature measurement accuracy, so we need to design a constant temperature device, put the optical fiber into the constant temperature device, and the system will perform temperature calibration according to the temperature of the constant temperature device. Laying along the cable close to the cable, many designs adopt the method of putting the optical fiber into the constant temperature device. This kind of design is not easy to realize in practical applications. Due to the limited fiber space, many calibrations need to cut the optical fiber, put the coiled optical fiber into the constant temperature device, and then melt the two ends of the fiber. This method greatly increases the calibration workload and causes great troubles for on-site calibration. , not convenient enough, a waste of manpower and material resources

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