An online calibration device and method for fiber grating strain sensor

Abstract

The invention relates to an online calibrating device and a method for a fiber Bragg grating (FBG) strain sensor, belonging to the technical field of metrological testing and calibrating. The device comprises a simulating plate to be tested, a boundary support component, a FBG strain sensor, a first transmission optical cable, a FBG demodulating instrument, an upper computer, a laser lens, a second transmission optical cable, a laser scanner vibration testing and analyzing system, an exciting device and an exciting device connecting line. The calibrating method provided by the invention is convenient and fast and has the characteristics of online calibrating, in-situ calibrating and dynamic calibrating; due to the characteristics, the calibrating method is suitable for engineering application and can provide a dynamic sensitivity coefficient for an attached bare FBG sensor and a packaged FBG stain sensor; and the online calibrating device and the method for the FBG strain sensor provided by the invention can be applied to detecting whether the attaching of the sensor satisfies the requirement or not and can also be used for calibrating the sensitivity coefficient of sensors after the sensors are used for a long time.

Description

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AI Technical Summary

Benefits of technology

This patented technology allows for easy onsite or real time adjustment during manufacturing processes without having to stop working over them again when they are needed due to changes that may affect their performance. It provides an efficient way to measure stress levels accurately with high accuracy even at very small dimensions (<1 mm) while still maintaining good signal quality.

Problems solved by technology

The technical problem addressed by this patented technology relates to improving upon current techniques for measuring stress waves caused by cracks formed during building construction due to environmental factors like temperature changes over time (TMO). Current solutions involve offsite laboratory tests involving expensive equipment and long periods before actual use can be costly compared against competitive alternatives made up from similar materials. This patents proposes an improved technique called optical fibre grating (OFC) sensors which have been developed earlier than traditional ones without any significant improvement in their ability to measure static loads accurately.

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