{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,9]],"date-time":"2026-06-09T14:54:06Z","timestamp":1781016846377,"version":"3.54.1"},"reference-count":22,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2022,1,7]],"date-time":"2022-01-07T00:00:00Z","timestamp":1641513600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>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.<\/jats:p>","DOI":"10.3390\/s22020430","type":"journal-article","created":{"date-parts":[[2022,1,9]],"date-time":"2022-01-09T23:08:26Z","timestamp":1641769706000},"page":"430","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Research on the Dual Modulation of All-Fiber Optic Current Sensor"],"prefix":"10.3390","volume":"22","author":[{"given":"Jianhua","family":"Wu","sequence":"first","affiliation":[{"name":"College of Electrical Engineering, Naval University of Engineering, Wuhan 430033, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaofeng","family":"Zhang","sequence":"additional","affiliation":[{"name":"College of Electrical Engineering, Naval University of Engineering, Wuhan 430033, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4841-0992","authenticated-orcid":false,"given":"Liang","family":"Chen","sequence":"additional","affiliation":[{"name":"College of Electrical Engineering, Naval University of Engineering, Wuhan 430033, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,1,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"116","DOI":"10.1109\/61.484007","article-title":"In-line Sagnac interferometer current sensor","volume":"11","author":"Blake","year":"1996","journal-title":"IEEE Trans. Power Deliv."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"172405","DOI":"10.1109\/ACCESS.2020.3018734","article-title":"Research and Application of Generator Protection Based on Fiber Optical Current Transformer","volume":"8","author":"Chen","year":"2020","journal-title":"IEEE Access"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"887","DOI":"10.1070\/QEL17022","article-title":"Recording of pulsed currents by a fibre-optic Faraday effect-based sensor with limited frequency band","volume":"49","author":"Gubin","year":"2019","journal-title":"Quantum Electron."},{"key":"ref_4","first-page":"7001206","article-title":"Design and Performance Study of a Temperature Compensated \u00b11100-kV UHVDC All Fiber Current Transformer","volume":"70","author":"Zhao","year":"2021","journal-title":"IEEE Trans. Instrum. Meas."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"112228","DOI":"10.1016\/j.fusengdes.2021.112228","article-title":"Performance assessment of plasma current measurement at JET using fibre optics current sensor","volume":"165","author":"Gusarov","year":"2021","journal-title":"Fusion Eng. Des."},{"key":"ref_6","first-page":"349","article-title":"Progress of Advanced Voltage\/Current Sensing Techniques for Smart Grid","volume":"45","author":"Yang","year":"2019","journal-title":"High Volt. Eng."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"98","DOI":"10.1109\/JLT.1983.1072090","article-title":"Fiber-Optic Gyroscopes with Broad-Band Sources","volume":"1","author":"Burns","year":"1983","journal-title":"J. Light. Technol."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"430","DOI":"10.1109\/JLT.1984.1073627","article-title":"Polarizer Requirements for Fiber Gyroscopes with High-Birefringence Fiber and Broad-Band Sources","volume":"2","author":"Burns","year":"1984","journal-title":"J. Lightwave Technol."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"18591","DOI":"10.1364\/OE.20.018591","article-title":"High-current-sensitivity all-fiber current sensor based on fiber loop architecture","volume":"20","author":"Zhang","year":"2012","journal-title":"Opt. Express"},{"key":"ref_10","first-page":"436","article-title":"Fiber Optical Current Transformers based on Modulated Light Source","volume":"42","author":"Liu","year":"2008","journal-title":"J. Xi\u2019an Jiao Tong Univ."},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Zhang, H., Jiang, J., Zhang, Y., Chen, H., Zhao, N., Lin, L., and Qiu, Y. (2017). A loop all-fiber current sensor based on single-polarization single-mode couplers. Sensors, 17.","DOI":"10.3390\/s17112674"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"17980","DOI":"10.1364\/OE.24.017980","article-title":"Highly sensitive and reconfigurable fiber optic current sensor by optical recirculating in a fiber loop","volume":"24","author":"Du","year":"2016","journal-title":"Opt. Express"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"2199","DOI":"10.1007\/s42835-020-00474-x","article-title":"Polarization Error Analysis of an All-Optical Fibre Small Current Sensor for Partial Discharge","volume":"15","author":"Xin","year":"2020","journal-title":"J. Electr. Eng. Technol."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"160268","DOI":"10.1109\/ACCESS.2021.3131520","article-title":"Research on Measurement Technology of Ship Leakage Current by All-Fiber Optic Current Sensor","volume":"9","author":"Wu","year":"2021","journal-title":"IEEE Access"},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Mihailovic, P., and Petricevic, S. (2021). Fiber Optic Sensors Based on the Faraday Effect. Sensors, 21.","DOI":"10.3390\/s21196564"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"107151","DOI":"10.1016\/j.measurement.2019.107151","article-title":"Influencing factors analysis on the detector output signal of fiber optic current transformer with sine modulation","volume":"151","author":"Pang","year":"2020","journal-title":"Meas. J. Int. Meas. Confed."},{"key":"ref_17","first-page":"218","article-title":"Contributions to Verdet constant of magneto-optical materials","volume":"66","author":"Cai","year":"2017","journal-title":"Wuli Xuebao\/Acta Phys. Sin."},{"key":"ref_18","unstructured":"Hu, G.S. (2012). Digital Signal Processing Theory, Algorithm and Implementation, Tsinghua University Press. [3rd ed.]."},{"key":"ref_19","first-page":"411","article-title":"Application of the Approximate Evaluation of Bessel Functions to Frequency Modulation System","volume":"11","author":"Lin","year":"1955","journal-title":"Wuli Xuebao\/Acta Phys."},{"key":"ref_20","unstructured":"Gao, J.Z. (2011). Detection of Weak Signals, Tsinghua University Press. [2nd ed.]."},{"key":"ref_21","first-page":"654","article-title":"Noise Analysis and SNR Optimization Design of Fiber Optical Current Transforms","volume":"43","author":"Hu","year":"2017","journal-title":"High Voltage Eng."},{"key":"ref_22","unstructured":"(2021, November 30). Available online: https:\/\/www.zhinst.cn\/china\/en\/products\/mfli-lock-amplifier#multi-device-synchronization."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/22\/2\/430\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,13]],"date-time":"2025-10-13T13:36:37Z","timestamp":1760362597000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/22\/2\/430"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,1,7]]},"references-count":22,"journal-issue":{"issue":"2","published-online":{"date-parts":[[2022,1]]}},"alternative-id":["s22020430"],"URL":"https:\/\/doi.org\/10.3390\/s22020430","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,1,7]]}}}