Measurement and calibration integrated marine fiber bragg grating strain sensor system

A technology of strain sensor and optical fiber grating, which is applied in the direction of using optical devices, instruments, measuring devices, etc., can solve the problems of inconvenience, insufficient sensor traceability system, and the lack of multiple installation and calibration of sensors, so as to achieve convenient use, Guarantee the effect of state consistency and stability

Pending Publication Date: 2019-12-27
中国船舶重工集团公司第七0四研究所
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Problems solved by technology

[0003] However, at present, the traceability system of this type of sensor is not perfect enough. Most of the sensors do not have the function of being able to be installed multiple times and can be calibrated. For strain sensors that have been in service for a long time, it has brought great inconvenience

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  • Measurement and calibration integrated marine fiber bragg grating strain sensor system
  • Measurement and calibration integrated marine fiber bragg grating strain sensor system

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with drawings and embodiments.

[0021] Such as figure 1 , as shown in 2, a marine fiber grating strain sensor system integrating measurement and calibration is composed of two parts: a fiber grating strain sensor and a sensor installation tool (calibration device), wherein the fiber grating strain sensor includes a sensor fixed end 1 and a sensor movable end 2 , protective steel pipe 3, fiber grating 4, fixed end welding base 8, movable end welding base 9, installation tool (calibration device) including positioning plate 5, high-precision differential screw rod 6, return spring 7.

[0022] One end of the pigtail fiber of the fiber grating 4 is fixed on the fixed end 1 of the sensor, and the other end is fixed on the movable end 2 of the sensor. The distance between the two points of the fixed fiber grating 4 is the effective strain length L, and the middle of the fiber grating 4 is protected by a pro...

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Abstract

The invention relates to a measurement and calibration integrated marine fiber bragg grating strain sensor system. The system is composed of a fiber bragg grating strain sensor and a sensor calibration device. Two ends of a fiber bragg grating are fixedly connected with a sensor fixed end and a sensor movable end. The sensor fixed end is fixedly connected with a positioning plate through utilization of a fixed end welding base. The sensor movable end is connected with the positioning plate through utilization of a movable end welding base. The movable end welding base can move front and back along the positioning plate, so a distance between two fixed points of the fiber bragg grating is an effective strain length L. A high-precision differential screw is fixedly connected with the positioning plate through utilization of a screw mounting base. The screw mounting base and the movable end welding base are connected through utilization of a return spring. Through matching of the high-precision differential screw and the return spring, the sensor movable end can be controlled to slide front and back and sliding displacement deltaL of the sensor movable end can be precisely controlled,so a standard dependent variable epsilon=deltaL/L is applied to the fiber bragg grating strain sensor, and the fiber bragg grating strain sensor is mounted or calibrated.

Description

technical field [0001] The invention relates to a fiber grating strain sensor system, which is mainly suitable for the measurement or long-term monitoring of the overall deformation of the hull. Background technique [0002] Because the fiber grating strain sensor has the advantages of anti-electromagnetic interference, corrosion resistance, light weight, small size, etc., it has played a huge role in the ship structure health monitoring system. On the one hand, the stress conditions and fatigue damage of key parts of the ship can be monitored in real time during the ship's navigation, and an early warning can be issued in case of a dangerous situation to ensure the safe navigation of the ship; Design, improve structure, improve shipbuilding capabilities, and make ships safer and more reliable. It is not difficult to see that the accuracy of the measured value of the fiber grating strain sensor is very important. [0003] However, the traceability system of this type of se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
CPCG01B11/16
Inventor 李涛林杰俊吴承勇苑翼飞
Owner 中国船舶重工集团公司第七0四研究所
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