A Loop All-Fiber Current Sensor Based on Single-Polarization Single-Mode Couplers

Zhang, Hao; Jiang, Junzhen; Zhang, Yu; Chen, Huaixi; Zhao, Ning; Lin, Lingyan; Qiu, Yishen

doi:10.3390/s17112674

Cited by 6 publications

(2 citation statements)

References 18 publications

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“…In conclusion, AFOCSs have been widely studied for highvoltage and high-current detection in power systems, and scholars have continuously used many means to improve the sensitivity and reliability of AFOCSs. These improvements include a new AFOCS based on a single-polarization singlemode coupler and fiber ring structure [92], an AFOCS based on an optical switch and ring cavity structure, an AFOCS using an integrated-optic polarization splitter combined with a reflective AFOCS [93], and an AFOCS with coupled Faraday rotators. However, although the stability of the sensors has improved, the effects of environmental changes, such as temperature, vibration, electromagnetic interference, and optical interference, have not been eliminated.…”

Section: ) All-fibermentioning

confidence: 99%

High-Current Sensing Technology for Transparent Power Grids: A Review

Sun,

Huang,

Peng

2024

IEEE Open J. Ind. Electron. Soc.

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The global energy industry is moving towards a trend of green and low-carbon transformation. A transparent power grid represents a new development form under this energy transition trend, integrating the power grid with new generation information and communication technologies, exemplified by the internet. The use of micro smart sensors allows real-time monitoring of many important parameters of power systems via current, which is crucial for ensuring safe, stable, intelligent, and green power grid operation. Here, based on the development logic of current sensing technology for traditional-smarttransparent power grids, we focus our research on high-current sensing in a transparent power grid. First, we review the widely used traditional current sensing methods of shunts and Rogowski coils. More advanced optical fiber current sensing methods and microelectromechanical system current sensing chips are then introduced, which are more suitable for the smart sensing requirements of transparent power grids. In addition, we present and discuss the technical characteristics, research status, application scope, advantages and disadvantages, and future development directions of the above methods in detail. Finally, we address many essential challenges including miniaturization, integration, low power consumption, passive wireless sensing, long-range operation, and complex environmental parameters in the comprehensive intelligent and transparent sensing of current parameters in power grids. To address these challenges, we present three possible development directions: sensor improvement, development of communication and networking technologies for sensors, and advancement of intelligent and fast processing methods through communication.

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Section: ) All-fibermentioning

confidence: 99%

High-Current Sensing Technology for Transparent Power Grids: A Review

Sun,

Huang,

Peng

2024

IEEE Open J. Ind. Electron. Soc.

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“…One is the laser diodes. Zhang et al use laser diodes as pulsed light sources to study the loop structure with single-polarization single-mode couplers [11]. The other type is the pulsed light source generated by an acousto-optic modulator (AOM).…”

Section: Introductionmentioning

confidence: 99%

Research on the Dual Modulation of All-Fiber Optic Current Sensor

Zhang

Chen

2022

Sensors

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Acousto-optic modulator (AOM) and electro-optical modulator (EOM) are applied to realize the all-fiber current sensor with a pulsed light source. The pulsed light is realized by amplitude modulation with AOM. The reflected interferometer current sensor is constructed by the mirror and phase modulation with EOM to improve the anti-interference ability. A correlation demodulation algorithm is applied for data processing. The influence of the modulation frequency and duty cycle of AOM on the optical system is determined by modeling and experiment. The duty cycle is the main factor affecting the normalized scale factor of the system. The modulation frequency mainly affects the output amplitude of the correlation demodulation and the system signal-to-noise ratio. The frequency multiplication factor links AOM and EOM, primarily affecting the ratio error. When the frequency multiplication factor is equal to the duty cycle of AOM and it is an integer multiple of 0.1, the ratio error of the system is less than 1.8% and the sensitivity and the resolution of AFOCS are 0.01063 mV/mA and 3 mA, respectively. The measurement range of AFOCS is from 11 mA to 196.62 A, which is excellent enough to meet the practical requirements for microcurrent measurement.

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