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Chinese Journal of Lasers, Volume. 46, Issue 10, 1010003(2019)

Online Monitoring and Controlling Technique of Loop Gain of Fiber Optic Current Sensors

Jia Yu1、*, Xiaxiao Wang1, Chunxi Zhang1, Chuansheng Li2, and Fu Ma1
Author Affiliations
  • 1School of Instrument Science and Optoelectronic Engineering, Beihang University, Beijing 100191, China
  • 2National Institute of Metrology, Beijing 100029, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (11)
    Equations (0)
    References (18)
    Cited By (2)
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    Figures & Tables(11)
    Configuration of FOCS

    Fig. 1. Configuration of FOCS

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    Digital control system of FOCS

    Fig. 2. Digital control system of FOCS

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    Simplified discrete dynamic model of FOCS

    Fig. 3. Simplified discrete dynamic model of FOCS

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    Loop gain versus frequency characteristic. (a) Loop gain versus amplitude; (b) loop gain versus phase

    Fig. 4. Loop gain versus frequency characteristic. (a) Loop gain versus amplitude; (b) loop gain versus phase

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    Scheme of loop gain online monitoring

    Fig. 5. Scheme of loop gain online monitoring

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    Sketch map of output demodulation of FOCS

    Fig. 6. Sketch map of output demodulation of FOCS

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    Measurement accuracy versus loop gain. (a) Scale factor error versus loop gain; (b) phase error versus loop gain

    Fig. 7. Measurement accuracy versus loop gain. (a) Scale factor error versus loop gain; (b) phase error versus loop gain

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    Stable controlling technique for loop gain

    Fig. 8. Stable controlling technique for loop gain

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    Measurement accuracy versus amplification. (a) Loop gain versus preamplifier gain; (b) scale factor error versus preamplifier gain;(c) phase error versus preamplifier gain

    Fig. 9. Measurement accuracy versus amplification. (a) Loop gain versus preamplifier gain; (b) scale factor error versus preamplifier gain;(c) phase error versus preamplifier gain

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    • Table 1. Amplification versus scale factor error and phase error

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      Table 1. Amplification versus scale factor error and phase error

      R /kΩAmplificationLoop gainScale factor error /%Phase error /(')
      11.810025.391500.1743000.000954-0.30811
      10.230021.994500.150200-0.017320-1.46754
      8.870019.070500.131200-0.015710-3.34291
      7.880016.942000.115400-0.018120-4.60070
      6.750014.512500.099210-0.013910-7.24607
      5.840012.556000.085590-0.014540-9.95570
      5.060010.879000.074250-0.010760-13.09000
      4.02008.643000.059020-0.015130-19.65430
      3.63007.804500.053370-0.021500-23.11220
      2.47005.310500.036280-0.023450-35.33240
      1.70803.672200.025320-0.031410-59.21930
      1.00702.165050.014780-0.074800-113.21600
      0.62701.348050.009220-0.193810-192.63300
      0.11320.243380.001671-5.736640-1150.83000

    • Table 2. Preamplifier gain and loop gain versus scale factor error and phase error with stable controlling technique

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      Table 2. Preamplifier gain and loop gain versus scale factor error and phase error with stable controlling technique

      R /kΩAmplificationLoop gainPhase error /(')Scale factor error /%
      12.03025.864500.17750.28430.00600
      11.06023.779000.17700.1745-0.01600
      10.04021.586000.1772-0.2352-0.00850
      8.99019.328500.1777-0.36520.02800
      8.05017.307500.1777-0.2635-0.00700
      7.01015.071500.17730.7851-0.01150
      5.98012.857000.17710.4937-0.02800
      5.05010.857500.17750.58160.07565
      4.0208.643000.17740.28740.01225
      3.0406.536000.1772-0.32560.01725
      2.1504.622500.1771-0.1571-0.02055
      1.0702.300500.1773-0.6143-0.03840
      0.5451.171750.1768-1.5234-0.04570
      0.1640.352600.1765-1.0781-0.04270
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    Jia Yu, Xiaxiao Wang, Chunxi Zhang, Chuansheng Li, Fu Ma. Online Monitoring and Controlling Technique of Loop Gain of Fiber Optic Current Sensors[J]. Chinese Journal of Lasers, 2019, 46(10): 1010003

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    Paper Information

    Category: remote sensing and sensor

    Received: Apr. 22, 2019

    Accepted: Jun. 10, 2019

    Published Online: Oct. 25, 2019

    The Author Email: Yu Jia (yu_jia1985@126.com)

    DOI:10.3788/CJL201946.1010003

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology