Health-aware distributed optical fiber calibration system and method for wading buildings

Abstract

The invention discloses a distributed optical fiber calibration system and method for health perception of wading buildings. and the second electronic thermometer, the optical cable to be calibrated is wound on the through shaft, the optical cable to be calibrated is connected to the optical fiber temperature demodulator outside the adiabatic barrel, the first electronic thermometer and the second electronic thermometer are respectively connected with the first temperature control outside the adiabatic barrel. The meter is connected to the second temperature control meter. The temperature source heating wire for heating the water in the insulation barrel is arranged in the barrel wall of the insulation barrel. The temperature source heating wire is connected to the power temperature control meter outside the insulation barrel. The first temperature control meter passes through The wire of the first temperature control meter is connected with the cooling and heating device at the same time. The distributed optical fiber calibration system for health perception of wading buildings of the present invention can flexibly control the temperature change in the adiabatic barrel through the cooling and heating device, and can achieve high-precision calibration of long-distance optical cables at one time.

Description

technical field [0001] The health-aware distributed optical fiber calibration system and method for water-related buildings according to the invention belong to the field of water conservancy and hydropower engineering safety. Background technique [0002] For dams, dikes, sluices, aqueducts, culverts, channels and other water-related structures, rapid and reliable monitoring of structural health is of great significance for timely detection of safety hazards and ensuring their safe service. With the development of distributed optical fiber sensing technology, it has become an important research direction in the fields of water conservancy, civil engineering and other engineering safety by using it to obtain structural behavior information and perceive structural health. Valuable practical experience. However, in the actual application of wading buildings, due to the particularity of the working environment and structural characteristics, many technical problems such as opt...

AI Technical Summary

Problems solved by technology

[0003] Traditional point monitoring instruments and technologies have corresponding monitoring specifications and processes, but there are no clear and mature operation and use regulations for the distributed optical fiber sensing of the health of wading buildings, especially the actual health sensing of wading buildings The length of the optical fiber used in the system sometimes reaches thousands of meters, and the weight reaches hundreds of kilograms. There is a lack of necessary solutions and measures for the calibration problems that affect the stability and accuracy of its monitoring.

[0004] In the monitoring application where the sensing fiber is longer than 100 meters, at present, it is mostly based on the idea of ​​segmental calibration, with the help of conventional thermometers to calibrate one or several segments, and use the average value of the temperature coefficient of the selected segment as the whole sensor. The temperature coefficient of the sensing fiber, its accuracy will continue to decrease as the length of the sensing fiber increases, and this method has disadvantages such as low calibration efficiency, short calibration length, light load weight, difficult temperature rise and fall, and difficult temperature control.

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