Optical fiber F-P/FBG composite cavity current and temperature synchronous measurement system

Abstract

The invention relates to an optical fiber F-P / FBG composite cavity current and temperature synchronous measurement system. An optical fiber F-P / FBG composite cavity is used as a sensing element; a magnetic field generating device generates a magnetic field under the action of current; the magnet suspended at one end of the strain gauge bonded with the optical fiber F-P / FBG composite cavity is attracted by the magnetic field, the cavity length of the optical fiber F-P / FBG composite cavity changes under the action of the magnet, and the relation between the measured current and the cavity lengthis established by measuring the cavity length change of the optical fiber F-P / FBG composite cavity. Besides, the optical fiber F-P / FBG composite cavity also has a temperature measurement function, the whole system not only can synchronously measure the temperature of the working environment, but also can utilize the temperature measurement data of the optical fiber F-P / FBG composite cavity to eliminate the measurement error caused by temperature change in the F-P cavity, i.e., eliminate the measurement error caused by expansion of the strain gauge due to temperature change, and realize the temperature self-compensation function.

Description

technical field [0001] The invention relates to the technical field of sensing and measurement, and more specifically relates to an optical fiber F-P / FBG composite cavity current and temperature synchronous measurement system. Background technique [0002] Current transformers are key detection devices for state monitoring and overcurrent protection in systems such as smart grids, high-power equipment, and new energy vehicles. Their accuracy, real-time performance, and reliability are directly related to the safe operation of the system. [0003] Electrical systems are potentially dangerous to the physical integrity of the human body, or have a highly polluted electromagnetic spectrum. Compared with traditional current sensors, optical current sensors have the advantages of anti-electromagnetic interference, safety, light weight, wide bandwidth, and are suitable for all-fiber devices (such as switching modulators, circulators, isolators, etc.), and their technical advantages...

AI Technical Summary

Problems solved by technology

The fiber Bragg grating (FBG) method is to measure the change of the fiber Bragg grating wavelength or the beat frequency shift between two polarization modes, but the Bragg grating fiber needs to be reused, which is easy to cause damage

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