Wading building health perception distributed fiber calibration system and method

Abstract

The invention discloses a wading building health perception distributed fiber calibration system and method; the wading building health perception distributed fiber calibration system comprises a heat insulation barrel, and a plurality of calibration modules positioned around an axis in the heat insulation barrel; the calibration module comprises a through shaft, a first electronic thermometer and a second electronic thermometer; the through shaft is winded by a calibrated cable connected with a fiber temperature demodulator outside the heat insulation barrel; the first and second electronic thermometers are respectively connected with a first temperature control meter and a second temperature control meter outside the heat insulation barrel; a temperature source heater used for heating the water in the heat insulation barrel is arranged in a barrel wall of the heat insulation barrel, and connected with a power temperature control meter outside the heat insulation barrel; the first temperature control meter is simultaneously connected with a cooling heating device through a first temperature control meter line. The wading building health perception distributed fiber calibration system uses the cooling heating device to flexibly control temperature changes in the heat insulation barrel, thus realizing high precision calibration for the long distance cable in a single 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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