Lithium niobate integrated MZI type optical waveguide large-current sensor and measuring system

Abstract

The invention discloses a lithium niobate integrated MZI type optical waveguide large-current sensor and a measuring system. The sensor comprises an x-cut y-pass lithium niobate wafer as a substrate of the lithium niobate integrated MZI type optical waveguide large-current sensor; and a multi-loop antenna which receives a magnetic field signal generated by a current-carrying wire to generate an induced current; wherein modulation electrodes and the multi-loop antenna are integrated on the asymmetric MZI optical waveguide. The left side and the right side of each loop of the multi-loop antenna are each provided with a pair of modulation electrodes. The asymmetric MZI optical waveguide is arranged on the x-cut y-pass lithium niobate wafer; the multi-loop antenna and the current-carrying wire are located on the same plane through the base, and the current-carrying wire is arranged on the side edge of the lithium niobate integrated MZI type optical waveguide large-current sensor. According to the invention, current measurement can be safely carried out under the condition of no contact with the measured current, energy radiation is avoided, the measurement efficiency is improved, the integration level and the stability of the sensor are greatly improved, and the complexity of the structure is reduced.

Description

technical field [0001] The invention relates to the field of optical current sensors, in particular to a lithium niobate integrated MZI type optical waveguide large current sensor and a measurement system. Background technique [0002] With the development of my country's power industry, the traditional power system is transforming into a modern power system. In enterprises and fields such as power companies, national defense and military industries, there are problems with the safe use of AC high current, DC high current and pulse high current generators, so high current measurement is essential in modern electrical systems. [0003] Shunts, current transformers and Rogowski coils are the traditional methods of current measurement. The resistance shunt method needs to be connected in series to the primary circuit, which makes installation inconvenient. There is no electrical isolation between the primary circuit and the secondary circuit, so it is not suitable for electroni...

AI Technical Summary

Problems solved by technology

The photoelectric hybrid sensor still uses the traditional electromagnetic induction principle, and the optical fiber is only used for signal transmission, and does not solve the influence of factors such as magnetic saturation and environmental magnetic field.

The all-fiber-optic current sensor also has a large change in the Verdet constant of the magneto-optical material due to the influence of temperature, which makes the sensor work very unstable and requires temperature compensation, and the optical fiber sensing coil used in the sensor also has a linear birefringence problem.

Although optical current sensors based on fiber Bragg gratings (FBG) and magnetostrictive materials overcome the problem of linear birefringence, the inherent temperature and strain cross-sensitivity of fiber gratings requires necessary temperature compensation.

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