A closed loop control direct current fiber optic current sensor

By integrating a polarization interferometric fiber optic temperature sensor and a grating optical valve type fiber optic DC current sensor, combined with a closed-loop demodulation algorithm and a low-power optically controlled signal source, the problems of environmental interference and high cost of traditional optical current transformers are solved, achieving high-precision and wide dynamic range current measurement and improving the real-time monitoring capability of power systems.

CN116359600BActive Publication Date: 2026-03-31QUJING BUREAU OF SUPERVOLTAGE POWER TRANSMISSION CHINA SOUTHERN POWER GRID
1 Cites 0 Cited by

Patent Information

Application Number
CN202310319666.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-03-29
Publication Date
2026-03-31
Estimated Expiration
2043-03-29

AI Technical Summary

Technical Problem

Traditional optical current transformers suffer from environmental interference sensitivity, high cost, and low reliability, making it difficult to achieve high-precision and wide dynamic range current measurement in power systems.

Method used

A grating-type optical valve fiber optic DC current sensor with closed-loop control is integrated with a polarization interferometric fiber optic temperature sensor in the same housing. The temperature of the grating-type optical valve fiber optic DC current sensor is measured by the polarization interferometric fiber optic temperature sensor. Error correction and optical feedback control are performed using a closed-loop demodulation algorithm and a low-power optical control signal source, thereby improving measurement accuracy and dynamic range.

Benefits of technology

It achieves effective compensation for changes in ambient temperature, improves the measurement linearity and dynamic measurement range of fiber optic current sensors, reduces system costs, and enhances the reliability of real-time monitoring of power systems.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The application discloses a closed-loop control direct-current fiber current sensor, which comprises a grating light valve type fiber direct-current current sensor and a polarization interference type fiber temperature sensor; the polarization interference type fiber temperature sensor and the sensing head of the grating light valve type fiber direct-current current sensor are integrated in the same shell; the temperature at the primary sensing head of the grating light valve type fiber direct-current current sensor is measured through the polarization interference type fiber temperature sensor; error correction is carried out according to the measured temperature information; and the influence of the environmental temperature change on the measurement accuracy of the grating light valve type fiber direct-current current sensor is corrected. Meanwhile, the micro-power light control signal source technology is adopted to realize the closed-loop light feedback control of the grating light valve type fiber direct-current current sensor, the measurement linearity of the grating light valve type fiber direct-current current sensor is improved in the closed-loop demodulation algorithm, and the dynamic measurement range is increased.
Need to check novelty before this filing date? Find Prior Art