Experimental Study on Optic Fiber Sensing System for Simultaneous Measurement of Current and Voltage Using One Lo Bi Fiber
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A sensor using a single monomode low birefringence (Lo Bi) fiber for simultaneous measurement of current and voltage has been designed, which uses Faraday effect for detection of current and Kerr effect for detection of voltage. Theoretical analysis shows that the current component can be measured free from the influence of the voltage component, and the two components can be easily separated. Experimental results demonstrate the feasibility of voltage sensing based on the Kerr effect of Lo Bi fiber, which is the main point in this proposal.Keywords:
Faraday cage
Current sensor
Component (thermodynamics)
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A new fibre optic sensor suitable for high voltage measurements is introduced. The sensor is based on a double pass configuration of light through a Bi12TiO20 (BTO) photorefractive crystal. To obtain the double pass configuration, a back-reflecting prism with high stability to temperature variations is incorporated in the sensor head. The prism enhances the performance of the sensor allowing the BTO to work in a wide linear region of its transfer function. To prove the feasibility of our fibre optic sensor, one ac periodic wave and transient event of high voltage were measured and reported. The sensor is proved to be robust, linear, and shows high resolution in the detection of voltage impulses.
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Presented is detailed information concerning the design of single detector fiber optic current sensors. Data is provided describing a novel passive technique used to compensate for the temperature induced Verdet constant changes in the sensing fiber.
Verdet constant
Current sensor
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We report a new configuration of the fiber optic voltage sensor based on the Bi12TiO20 crystal, which allows simultaneous measurements of both voltage and temperature. In our scheme, a quarter-wave plate, being an inherent element of voltage sensor, serves simultaneously as a phase-shifting element and as a temperature sensitive element. The sensor operates at two wavelengths (633 nm and 976 nm). The sensor has a linear temperature characteristic within the range of 10divided by70 degree(s)h, providing the accuracy of temperature measurements of 0.3 degree(s)h. As a voltage sensor, this device has a linear amplitude characteristic up to 1000 Vrms and the excellent temperature stability of 0.1 % within the temperature range of 10divided by70 degree(s)h.
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Atmospheric temperature range
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Electrostriction
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A novel sensing structure of optical fiber current sensor for DC measurement in high voltage systems is presented.Adopting this novel sensing structure sensor,a high accurate demodulation is achieved,and the drawback that measurement error is prominent for asymmetry light output can be overcome.The test results show that even difference between the attenuation coefficients of double-light-paths is 5 times that the relative error of the measured DC is less than 0.2%.
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A fiber-optic displacement sensing scheme based on high-precision detection of differential phase is proposed, with advantages of simple structure, low cost, high precision, large dynamic range, polarization independent, and remote sensing ability. The designed displacement sensor is composed of a sensing fiber, a reference fiber, a Fabry-Perot laser diode, five couplers, two photodiodes and a signal processing circuit. The reference fiber is used for temperature compensation. The optical path difference (OPD) between the two fibers varies with the stretch of the sensing fiber. By high-frequency sinusoidal modulation of the laser source, the OPD can be converted to the differential phase between the reflected lights from the endfaces of the two fibers. The differential phase is detected by cross-correlation method. Experimental results show that, the resolution of the static displacement measurement has been achieved to be 1.4 μm. In addition, the dynamic range is estimated to be 2.66 m. Furthermore, the designed sensor shows the capability of dynamic displacement measurement.
Differential phase
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We investigate the effects of temperature on a optical fiber voltage sensor. The sensor is based on the converse piezoelectric effect of quartz. The piezoelectric deformation of the cylinder-shaped transducer crystal induced by an applied at voltage is sensed by an elliptical-core dual-mode fiber. The resulting modulation of the differential phase of the LP/sub 01/ and even LP/sub 11/ modes of the fiber is remotely detected by coherence-tuned interrogation using a 780-nm multimode laser diode source. A second dual-mode fiber acts as a receiver interferometer. We determine the influence of temperature on the scale factor of the transducer and on the accuracy of the interferometric interrogation. We further show that the sensitivity to temperature of the group index difference of the sensor fiber modes can be exploited to temperature-correct the scale factor of the transducer.
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A sensor using a single monomode low-birefringence (Lo-Bi) fiber for simultaneous measurement of current and voltage has been designed, which uses Faraday effect for detection of current and Kerr effect for detection of voltage. Theoretical analysis proved the current component can be measured free from the influence of the voltage component, and the two components can be easily separated. Experimental results demonstrate the feasibility of the Kerr effect of the Lo-Bi fiber for sensing voltage, which is the main point in this proposal.
Faraday cage
Current sensor
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I report on an interferometric optical-fiber sensor for high-voltage measurements in gas-insulated high-voltage switch gear (GIS). Significant performance parameters of two different types of fiber interferometers are investigated.
High Voltage
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We describe a fiber optic voltage sensor with optically controlled sensitivity. The sensor operates at two widely separated wavelengths (633 and 976 nm), one of which is a control signal (976 nm). We show that at a properly chosen wavelength of the control signal and of the phase-retarding element, variations of the power of the control signal allow increases or decreases in the sensitivity of the sensor. A theoretical analysis of sensitivity as a function of the optical power of a control signal is presented. We have demonstrated experimentally variation of the sensor's sensitivity from 0.01% to 0 per 1 V/sub rms/ of control power changes in the range of 0-7 μW.
SIGNAL (programming language)
Optical power
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