Measurement and calibration integrated marine fiber bragg grating strain sensor system

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...

AI Technical Summary

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

Images