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Fiber Bragg grating sensor for ship body structure pressure monitoring under wave load effect and application

A technology of optical fiber grating and wave load, which is applied in the direction of measurement, instrumentation, and force measurement by measuring the change of optical properties of materials when they are stressed, so as to enhance sensitivity, increase the range of pressure monitoring, and ensure durability and reliability. Effect

Pending Publication Date: 2020-04-28
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the existence of many uncertain factors in the marine environment, the sensor equipment and other devices installed on the hull must have high working stability and real-time monitoring data. Traditional civil and commercial devices can no longer meet the requirements.

Method used

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  • Fiber Bragg grating sensor for ship body structure pressure monitoring under wave load effect and application
  • Fiber Bragg grating sensor for ship body structure pressure monitoring under wave load effect and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The optical fiber grating sensor used for pressure monitoring of the hull structure under the action of wave load is characterized in that it mainly includes: a sensor housing 4, a sensor sealing cover 9, a pressure conversion structure, and a sensor internal sensitivity enhancement structure;

[0031] Wherein the sensor shell 4 is a cylindrical shell made of aluminum alloy through cutting, grinding and oxidation steps.

[0032] The sensor sealing cover 9 is provided with a sealing groove 10 and a sealing cover fixing hole 7 around it, and a sealing strip made of silica gel is nested in the sealing groove 10, and the sensor sealing cover 9 is connected with the sensor housing 4 by fixing screws. Fixed seal. The sensor sealing cover 9 is provided with a watertight flange mounting hole 12 .

[0033] The pressure conversion structure is mainly composed of a circular diaphragm 3 and a force transmission column 2 made of beryllium bronze, and the circular diaphragm 3 and th...

Embodiment 2

[0036] Methods of use include:

[0037]When the hull structure is subjected to wave loads caused by changes in the external environment, the sensor installed at the bow of the hull is directly in contact with the wave load, and the wave load acts on the pressure conversion structure of the sensor. The force transmission column 2 moves vertically downward under the action of pressure on the shaped diaphragm 3, and the two groups of flexible hinge structures 1 of the internal sensitization structure generate horizontal outward displacement under the action of the force transmission column 2, and are pasted on the two The fiber grating between the flexible hinge structures 1 is stretched, and the change of the center wavelength of the fiber grating basically has a linear relationship with the pressure change. Through the compensation algorithm, the relationship between the center wavelength of the fiber grating and the pressure change of the hull structure is finally obtained.

...

Embodiment 3

[0040] The fiber grating sensor used for pressure monitoring of hull structure under wave load and the existing traditional pressure sensor are applied in the same environment, and the fiber grating sensor used for pressure monitoring of hull structure under wave load has a larger measurement range and Higher measurement accuracy. Under the seawater pressure of 4.5Mpa, the measurement accuracy of the fiber grating sensor used for the pressure monitoring of the hull structure under the wave load can reach 0.05% of the full range, while the traditional pressure sensor can only reach 0.5% of the full range.

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Abstract

The invention relates to a fiber Bragg grating sensor for monitoring the pressure of a ship body structure under the action of a wave load and an application. The fiber Bragg grating sensor mainly comprises a sensor shell, a sensor sealing cover, a pressure conversion structure and a sensor internal sensitization structure. Flexible hinges of the internal sensitization structure are connected withthe sensor shell through fixing screws, and a fiber Bragg grating is pasted and attached between the fiber Bragg grating pasting points of the two beryllium bronze flexible hinge structures through epoxy resin glue. The fiber Bragg grating in the sensor is connected with a transmission optical cable of a ship body through a watertight flange on the sensor sealing cover, and the wavelength changeof the fiber Bragg grating is transmitted to a demodulator. The durability and reliability of application of the fiber Bragg grating sensor for monitoring the pressure of a ship body structure under the action of the wave load in the ocean field are ensured by utilizing the aluminum alloy structure shell and the sealing cover.

Description

technical field [0001] The invention belongs to the technical field of optical fiber grating sensors, in particular to an optical fiber grating sensor used for pressure monitoring of hull structures under wave loads and its application. Background technique [0002] Ships serving in the harsh ocean environment for a long time will be affected by the external environment, such as abnormal temperature changes, hull impact pressure, wave impact load, strong wind and huge waves, etc. These will not only affect the normal navigation of the hull, but are more likely to seriously damage the hull structure and on-board facilities. Among them, the pressure of the hull structure under the action of wave load is one of the important parameters of the hull system monitoring. If the pressure change of the hull structure can be monitored in time, the structural safety of the hull will be enhanced and the overall reliability will be improved. [0003] As an important part of fiber optic s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/24
CPCG01L1/242
Inventor 王为杨靖平乔立波刘传奇
Owner TIANJIN NORMAL UNIVERSITY