WO2011069558A1 - Détection de courant à fibre optique à l'aide d'un capteur doté de sous-modules pouvant être échangés - Google Patents

Détection de courant à fibre optique à l'aide d'un capteur doté de sous-modules pouvant être échangés Download PDF

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Publication number
WO2011069558A1
WO2011069558A1 PCT/EP2009/066977 EP2009066977W WO2011069558A1 WO 2011069558 A1 WO2011069558 A1 WO 2011069558A1 EP 2009066977 W EP2009066977 W EP 2009066977W WO 2011069558 A1 WO2011069558 A1 WO 2011069558A1
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Prior art keywords
measuring unit
fiber
current
sensor
scaling function
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PCT/EP2009/066977
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English (en)
Inventor
Klaus Bohnert
Andreas Frank
Robert Wüst
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Abb Research Ltd
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Application filed by Abb Research Ltd filed Critical Abb Research Ltd
Priority to AU2009356476A priority Critical patent/AU2009356476C1/en
Priority to JP2012542370A priority patent/JP2013513785A/ja
Priority to EP09796363.1A priority patent/EP2510364B1/fr
Priority to CN200980162796.8A priority patent/CN102667502B/zh
Priority to PCT/EP2009/066977 priority patent/WO2011069558A1/fr
Publication of WO2011069558A1 publication Critical patent/WO2011069558A1/fr
Priority to US13/492,364 priority patent/US9310399B2/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
    • G01R15/245—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect
    • G01R15/246—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect based on the Faraday, i.e. linear magneto-optic, effect
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
    • G01R15/247—Details of the circuitry or construction of devices covered by G01R15/241 - G01R15/246

Definitions

  • the invention relates to a method for operating a fiber-optic current sensor as well as to a fiberoptic current sensor for carrying out this method.
  • Fiber-optic current sensors have been described in Refs. 1 to 7.
  • a sensor consists of a sensor head, an optoelectronic measuring unit and a fiber cable in between.
  • the sensor head comprises a sensing fiber wound around the conductor whose current I is to be measured and an optical retarder connected to the sensing fiber.
  • the optical retarder causes a differential phase shift of approximately 90", thereby converting between the linearly polarized light in the connecting fiber and the circularly polarized light in the sensing fiber.
  • the magnetic field of the current I introduces a phase shift between the left and right circularly polarized light waves propagating in the sensing fiber.
  • the optoelectronic measuring unit contains a light source and a light detector as well as a signal processor. Light from the light source is sent through the connecting fiber to the sensor head. Light returning from the sensor head is processed and measured by the light detector, and a signal S is derived therefrom. The signal processor calculates the .current I from the signal S.
  • this calculation requires the knowledge of calibration data of the current sensor in order to account for the response and non-linearities of the sensor.
  • This type of sensor is often used in high- voltage environments, such as a substation of an electricity transmission and distribution network, and the sensor head is mounted at a high-voltage potential. For example it may be placed on top of a free-standing electric insulator column or integrated in other high-voltage equipment, such as a circuit breaker.
  • the optoelectronic measuring unit is placed at ground potential, for example in an outdoor cabinet near the circuit breaker or in the substation control room.
  • the problem of the present invention is to provide a method of the type mentioned above for measuring a current by means of an optoelectronic current sensor and that allows for simple maintenance of the sensor.
  • f e ' (S) and/or f s ' (S) may be affected by the temperatures T e and T s of the measuring unit and sensor head, respectively.
  • the invention is based on the understanding that the scaling function of the current sensor can be described as a product of a scaling function of the measuring unit and a scaling function of the sensor head. Hence, it becomes possible to exchange the measuring unit or sensor head without re-calibrating the sensor, as long as the replaced part comes with u description of its scaling function f e 'or f s ' .
  • the scheme according to the present invention allows to determine the measuring unit scaling function f e ' independently from the sensor head scaling function fs'-
  • nominally identical sensors may somewhat differ in their response as a result of imperfections of the sensor components and raanufacturing tolerances. It has been discovered theoretically and experimentally, however, that the influence of such imperfections essentially disappears at a magneto-optic phase shift of ⁇ (and corresponding current) . This point in the scaling function of the sensor may thus advantageously serve as an absolute reference for the calibration. Furthermore, it has been observed that imperfections reduce the interference fringe contrast particularly at small magneto-optic phase shifts (currents) and commonly enhance the sensor scale factor in this regime. The scale factor enhancement can therefore advantageously be derived from a measurement of the fringe contrast. With two points in the lower and upper range of the scaling function given in this way the whole function can be derived from a theoretical model. The procedure and modifications of it may be applied to the individual calibration of the measuring unit and sensor head.
  • the invention also relates to a fiber-optic current sensor for carrying out the method above.
  • the sensor comprises a sensor head having a sensing fiber wound around the conductor and a retarder connected to the sensing fi.ber,
  • a measuring unit comprising a light source and a light detector
  • the senor comprises a first memory attrnubbed to the measuring unit for storing the data describing the measuring unit scaling function f e ' as well as the data describing the sensor head scaling function f s ' and a second memory attributed to the sensor head for storing the data describing the sensor head scaling function f s ' .
  • Fig. 1 shows a first embodiment of a sensor
  • Fig. 2 shows a second embodiment of a sensor
  • Fig. 3 shows a third embodiment of a sensor
  • Fig. 4 shows an exemplary illustration of f e vs. the term 4 ⁇ al three different temperatures T e ,
  • Fig. 5 shows f e at a constant temperature but for three different sensors
  • Fig. 6 shows the normalized interference intensity vs. the phase shift ⁇ t> mo d'
  • Fig. 7 shows angles between the axes of the sensing fiber and the retarder axes
  • Fig. 8 shows function f s vs. the term 4(pp for three retarders
  • FIG. 1 An advantageous sensor version is shown Fig. 1. It comprises a measuring unit 1 and a sensor head 2.
  • Measuring unit 1 comprises a light source 3 and a y-type integrated-optic phase modulator 4.
  • a 90" splice 5 is arranged at one of the outputs of phase modulator 4, after which the light waves are reoombined in a polarization maintaining fiber coupler 6.
  • the light coming back from sensor head 2 also passes phase modulator 4 and arrives at a light detector 7,
  • a signal processor 8 is used to process the signal from photodiode 7 and to control the operation of phase modulator 4.
  • Sensor head 2 comprises a retarder 10 and one or more loops of a sensing fiber 1.1.
  • Sensing fiber 11 is wound around a current conductor 12, which carries the current I to be measured.
  • a reflector 13 is arranged at the end of sensing fiber 11.
  • a polarization maintaining fiber 15 connects sensor head 2 and measuring unit 1. At its one end, it is connected, e.g. via a fiber connector 16, to coupler 6, At its other end, it is connected to retarder 10.
  • FIG. 2 Another somewhat simplified advantageous version is shown in Fig. 2.
  • the combination of the y- type integrated-optic phase modulator and the polarization-maintaining fiber coupler of Fig. 1 is replaced by an integrated-optic birefringence modulator 18, such as a LiNbC>3 differential phase modulator, which serves here as non-reciprocal, phase modulator for light waves with orthogonal polarization directions.
  • Light source 3 is preferably a broadband source, for example a superluminescent light emitting diode ⁇ SLED) , whose light is depolarized in a fiber Lyot depolarizer (not shown) .
  • the light is sent through a fiber coupler 19, and then polarized in a fiber polarizer 20.
  • the polarized light is coupled into the polarization-maintaining (pm) fiber pigtail of the phase modulator 18 in such a way that the two orthogonal polari abion modes of the pigtail (with polarization directions along the fast and slow fiber axes) are excited with about the same amplitudes.
  • the polarization direction of the light from the fiber polarizer is aligned at 45° with respect to the birefringent axes of the pigtail fiber.
  • the pigtail axes in turn are aligned parallel to the electro-optic axes of the modulator.
  • the two orthogonal light waves travel from the modulator to the sensing fiber through polarization- maintaining fiber 15.
  • One or several loops of sensing fiber 11 enclose the current conductor 12.
  • the orthogonal linear polarizations are converted into loft and right circular polarizations at the near end of the sensing fiber 11 by means of a short section of polarization- maintaining fiber (preferably elliptical-core fiber) acting as a quarter-wave retarder 10.
  • a short section of polarization- maintaining fiber preferably elliptical-core fiber
  • the quarter-wave retarder 10 converts the returning circular waves back to orthogonal linear waves.
  • the polarization direclions of the backward traveling linear waves arc also interchanged.
  • the magnetic field of the current I produces a differential phase shift ⁇ proportional to the current I between the left and right circularly polarized light waves.
  • the light waves in the sensing fiber 11 may be prepared with a defined elliptical polarization state instead of circular polarization in order to compensate for the temperature dependence of the Faraday effect. This is also true in the embodiment of Fig. 1.
  • the returning linearly polarized waves again pass modulator 18 and then are brought to interference at fiber polarizer 20.
  • the interference signal is detected at the light detector 7.
  • a closed-loop detection circuit including the modulator recovers the current-induced phase shift by a technique as known from fiber gyroscopes [9, 10] .
  • the fiber 15 between the measuring unit and the sensor head is equipped with a polarization-maintaining fiber connector 16.
  • the connector 16 simplifies the installation of the sensor and allows to separate measuring unit 1 from sensor head 2 in case replacement of one of the two components should be required.
  • An alternative to a fiber connector is fiber splicing.
  • Sensing fiber 11 may be a standard single- mode fiber or a single-mode fiber produced with particular low intrinsic linear birefringence (low birefringence fiber) .
  • the bare fiber resides in a thin capillary of fused silica in order to avoid fiber stress from a coating or from packaging [1, 3, 7], Such stress could disturb the Faraday-sensitive (circular or elliptical) polarization of the light waves and deteriorate the performance of the sensor.
  • the fiber coil may be thermally annealed in order to remove bend-induced linear fiber biref ingence, or it may be a non-annealed fiber. In the latter case the bend-induced birefringence may be taken into account as described further below.
  • the sensing fiber may be a highly bire- fringent spun fiber [13].
  • the bend-induced linear biref ingence is effectively quenched by an appropriate amount of circular birefringence built into the fiber.
  • modulator 18 is a lithium niobate modulator with the waveguide produced by titanium in- diffusion into the lithium niobate substrate [11].
  • the waveguide supports the orthogonal polarization modes of the fundamental spatial mode (TE and TM modes) .
  • the substrate is x- cut or z-cut. (x-axis or z-axis perpendicular to the plane of the substrate, respectively) .
  • the light propagates in y-direction.
  • the fiber pigtail between polarizer 20 (45°-splice) and modulator 18 is chosen with a length sufficient to make the two orthogonal polarizations incoherent at the fiber end close to the modulator.
  • open-loop detection may be used.
  • a piezoelectric ceramic disk or tube with the fiber wrapped on its circumferential surface may be used as a modulator [1, 5] .
  • Fig. 3 shows a sensor of the same type but having three sensor heads 2 operated with a common measuring unit 1, i.e. with a common light source 3 and a common signal processing unit 8.
  • the light from the common light source 3 is distributed onto the three channels by means of a 1 x 3 fiber coupler 21.
  • the subsequent 2 x 1 fiber couplers 19 are asyittmetric couplers, for example with a coupling ratio of 0.8 : 0,2 instead of 0.5 : 0.5.
  • Light source 3 is thus less prone to pe turbations by back-reflected optical power. 2.
  • V is the Verdet constant of the sensing fiber
  • N is the number of sensing fiber loops around the conductor
  • 1 is the electric current through the conductor.
  • Temperature-compensation according to Ref. 1, 4 works with a retarder that deviates from 90° by an amount ⁇ .
  • the proper value of ⁇ depends on properties of the retarder fiber and in case of a non-negligible bend-induced birefringent phase retardation ⁇ in the sensing fiber on the amount of ⁇ and the orientation of the retarder axes ⁇ with respect to the plane of the fiber coil.
  • a non-90°- retarder leads to a change in the scale factor which depends on ⁇ , ⁇ and , and thus on the retarder fiber properties and coil parameters, and therefore may vary for different sensor coils [3] .
  • the modulator imperfections may vary as a function of temperature.
  • imperfections affect the scale factor of the sensor and introduce nonlinearity in the signal- versus-current relationship. Furthermore, imperfections such as birefringence and polarization cross-coupling commonly vary with temperature and thus may contribute to the temperature dependence of the sensor.
  • Measuring un.lt 1 translates the current- induced phase shift ⁇ into an electrical signal (digital word or analog current or voltage) .
  • the calibration process commonly also includes temperature cycles for measuring unit 1 and sensor head 2 in order to account for the influence of temperature or to verify proper temperature compensation.
  • f c accounts for any of the above mentioned impe fections, nonlinearities and temperature dependencies, if present.
  • the wavelength dependence of the Verdet constant is considered further below.
  • f c is a function of the current I or (equivalently) the signal S, the sensor head temperature T s and the measuring unit temperature T e .
  • i c may also vary somewhat with wavelength. For the purpose of this description all effects of wavelength are included in a common correction term (see below) .
  • f c I, T g , T e ) is equal to unity under all conditions.
  • Factor k is a constant which, in case of digital electronics for example, sets a fixed relation between the least significant bit and the optical phase shift in terms of radians.
  • Equation (5) may be rewritten as
  • the senor may be equipped with one or several temperature sensors which measure T e and/or T s .
  • I F ⁇ L (S) with F _1 (S) being the inverse of function F(I).
  • a conventional calibration process is done for a sensor as a whole, i.e. sensor head 2 and measuring unit 1 are not calibrated individually. Since the mentioned imperfections differ from device to device, it is commonly not possible to exchange the measuring unit or a sensor head, for example in case of a component failure, without loosing to a certain degree the accuracy of the original calibration. Therefore, component failure in the field may require exchanging the complete sensor since on-site recalibration often may not be possible. Exchange of a complete sensor may be awkward, however, as the sensor head may be integrated in other high-voltage equipment, such as switchgear. As a result the full replacement of a sensor may require a shutdown of the equipment and an extended interruption of service.
  • the measuring unit is considered to be more prone to failure than the sensor head, the latter consisting of passive components only.
  • Measuring unit 1 measures the phase shift ⁇ and converts it into a digital quantity.
  • the digital signal is inherently calibrated in units of radian.
  • the closed-loop signal processing circuit considered above applies a phase ramp to the modulator, the instantaneous slope of which is proportional to the instantaneous phase shift ⁇ and current.
  • the ramp voltage increases linearly with time until it roaches an upper limit.
  • a control loop then resets the voltage by an amount equivalent to a phase shift ⁇ of 2 ⁇ (i.e. the working point is shifted to an adjacent inter ⁇ ference fringe) .
  • the interference signal as function of ⁇ has a periodicity of 2%.
  • the voltage step needed for a 27t-resei represents a calibration of the voltage in terms of radians and thus defines the factor k. See Ref. 10 for details. Finally, the voltage is calibrated in units of current (Ampere) by sending a known current through the sensor head.
  • phase calibration may be derived from the first two or four harmonics of the modulation frequency seen at. the detector .
  • the functions f e , f s (fe'r fs' ) can be determined independently of each othe .
  • function f e may depend on temperature for reasons mentioned above.
  • Fig. 5 shows f e at a con ⁇ stant temperature but for different measuring units.
  • the variation in the degree of imperfections from unit to unit may cause i e to differ as illustrated.
  • it has been found theoretically and confirmed experimentally that the influence of the imperfections largely disappears at a current-induced phase shift 4 ⁇ p j 4 V N I equal to mul.ti- pies of i, i.e.
  • measuring unit 1 is connected to a reference sensing head having a known sensor head scaling function f s or f s ' .
  • a coil with negligibly small birefringence may be realized with a single loop of fiber having intrinsically low birefringence and with sufficiently large loop diameter, for example 1.5 m. Bend- induced fiber stress and birefringence at this diameter may be considered as negligible. Assuming a loop diameter of 1.5 m, a fiber diameter of 00 ⁇ , and a wavelength of 1310 ran the birefringent phase retardation is only about 0.6°.
  • the- fiber is prepared and packaged as described in Ref. 3, 7 in order to avoid packaging- related stress.
  • the generation of optical phase shifts of 7T at 1310 nm requires currents of about 750 kA in case of one fiber loop. This may be achieved, e.g.
  • the fiber retarder is preferably a short section of birefringent , elliptical-core fiber. In contrast to fibers with stress-induced birefringence, the retardation of this type of retarder has relatively little temperature dependence.
  • the desired 90 "-retardation may be approached from an initially larger start value, e.g. 95°, by a fine-tuning procedure as described in Ref. 1, 4, 12.
  • a measure to determine when the retardation of 90° has been reached is as follows: After each fine-tuning step the retarder temperature is varied, e.g. between -20°C and 100°C, and the resulting effect on the sensor signal at a given current is measured.
  • thermoelectric cooler /heater may be used for temperature control.
  • the current is chosen such that 4 ⁇ « ⁇ , since the sensitivity of the signal to deviations of the retarder from 90° is largest if 4 ⁇ p is near zero.
  • the phase retardation is at 90° when the influence of the retarder temperature on the sensor signal is at a minimum. This is due to the fact that the sensor scale factor varies approximately in proportion to ⁇ 2 with « being the deviation of the re ⁇ tarder from 90° (Ref. 1, 4) . Deviations from perfect signal linearity are well below 0,1% for a fiber coil prepared in this manner.
  • Another criterion which may be used for retarder tuning is the fact that the signal (scale factor) reaches a minimum at a retardation of 90°. It is obvious that, if the retarder manufacturing is suffi ⁇ ciently well under control, extra fine-tuning may be avoided and the retarder may be produced directly with the desired 90°-redardation.
  • the calibration of the measuring unit involves the measurement of the sensor signal S as a function of current I (or 4cpp) at selected temperatures T e .
  • the scaling functions ⁇ ⁇ (4 ⁇ , T e ) and f e ' (S, T e ) are then also known. Note: For calibration it is sufficient to determine the products g-f e , (l/g)'f e ', i.e. explicit knowledge of g is not required.
  • the values of the. scaling function f e ⁇ I, T e ) (or equivalently of f e ' (S, T e ) ) can be determined for a plurality of current values I (or, equivalently, for a plurality of signal values S) and temperatures T e and the obtained values may be sLored in a look-up table.
  • the look-up table is then used Lo calculate current I from measured signal S and temperature T G .
  • f e ' (S, T e ) f e '(S, T 0 ) f e ' (S 0 , T e ) / f e ' (S 0 , T 0 ) (12)
  • the current I is then calculated from the raw signal S as follows:
  • the functions f e ' (S, T 0 ) and T e ) may again be stored in look-up tables.
  • the functions may also be represented by spline curves.
  • the measuring unit is again connected to an ideal fiber coil, i.e. f s is equal to unity ndependent of current at a reference temperature T 0 .
  • f s is equal to unity ndependent of current at a reference temperature T 0 .
  • the above mentioned imperfections introduce nonlinearj.ty as illustrated in Fig. 4, 5 and at the same time reduce the fringe visibility.
  • Fig. 6 shows the normalized interference intensity vs.
  • the procedure may be repeated for various temperatures of the measuring unit in order to determine the variation of f e with temperature, if there is any, i.e. f e (I, T e ) (as well as f e ' (S, T e ) ) .
  • the parameter g is considered as known and constant for all sensors of a given type.
  • the parameter h can be determined from the interference fringe visibility.
  • the interference fringe visibility is, in turn, measured by operating modulator 4 or 10 for introducing a phase shift between the light polarizations emitted by measuring unit 1, thereby generating the interference fringes at light detector 7.
  • the parameter h may be determined by applying a small current, i.e. ⁇ «1 (again using the ideal coil from above).
  • measuring unit 1 is again connected to an ideal sensing head having a sensing head scaling function f g ⁇ 1.
  • the sensing fiber of the ideal sensing head is wound around the conductor carrying the current I.
  • function f e is mainly determined by the polarization cross-talk (PCT) at the phase modulator and its fiber pigtails (light coupling between the ordinary and extraordinary axes). Therefore, it may often be sufficient to simply measure the modulator crosstalk and its temperature dependence and derive the parameter h and thus functions f e , f e 'as follows:
  • the polarization crosstalk is defined as
  • a preferred design of the sensing head intentionally uses a non-90°- retarder (e.g. retarder with a retardation of 100"). By choosing a proper retardation, the temperature dependence of the retardation and its effect on the sensor scale inherently balance the temperature dependence of the Verdet constant [lj. An extra temperature sensor at the fiber coil for temperature compensation can be dispensed with.
  • phase shift ⁇ may be written as [3]
  • ⁇ and ⁇ denote the birefringent phase retardation in the sensing fiber due to bend-induced and intrinsic birefringence, respectively.
  • the angles ⁇ and pi are the angles between a principal axis of the polarization-maintaining fiber lead and the slow axes of the bend-induced and intrinsic birefringences, respectively (Fig. 7).
  • the slow axis of the bend-induced birefringence coincides with direction of the normal of the fiber coil.
  • r denote the fiber and loop radii, respectively.
  • the fiber coil is connected to a measuring unit calibrated as described above, i.e. measuring unit scaling functions f 0 f e ' are known.
  • the scaling functions f s (or the product of g and f s ) and f s ' are determined by applying a range of currents and measuring the resulting signal S.
  • the fiber coil is connected to a calibrated measuring unit wiLh known parameters a e and h e .
  • Function f s is then determined for the entire current ranqe according to the equations above.
  • the acaling function f s at small magneto- optic phase shifts (4 ⁇ pp « 1.) is determined by applying a small current.
  • the remaining procedure is as in section b.
  • the value of ⁇ (or ⁇ if applicable) can be fitted to the measured data, and therefrom f s can be calculated for any values of I or S using Eqs. (23 - 28) or Eqs. (28 - 31) .
  • the fiber coil discussed above is inherently temperature compensated, i.e. no extra measures are needed with regard to temperature for calibration.
  • Fiber coils not inherently temperature compensated may be equipped with one or several extra temperature sensors.
  • the Verdet constant V is a function of wavelength.
  • the light source is a broadband semiconductor source such as a superluminescent diode.
  • ⁇ is the center of gravity wavelength for the given spectrum. This wavelength is affected by the source temperature and drive current and, if not kept constant, these parameters must also be taken into account.
  • the calibration data of measuring unit 1 including the information on the source wavelength as well as the calibration data of the sensing head including the number of fiber loops are stored in a first memory 22 of the measuring unit 1.
  • the calibration data of sensor head 2, including the number of fiber loops, may also be stored in a second memory 23 attributed to sensor head 2, e.g. in an Erasable Programmable Read Only Memory
  • first memory 22 is arranged in measuring unit 1.
  • Second memory 23 is part of the sensing head 2, i.e. it is physically connected to sensing head 2.
  • Second memory 23 can e.g. be located at the control unit end of the polarization maintaining fiber cable 15 connecting the coil with the measuring unit.
  • the measuring unit reads the coil data and reconfigures itself with the new data.
  • calibration data hlPROM 23 may contain further parameters such as the optical loss in the sensor head and fiber cable length . 4. Notes
  • the measuring unit and the sensor head may be separated from each other or rejoined by means of one or severa.l. fiber connectors along the connecting fiber cable.
  • the fiber may be spliced by means of a fusion splicer.
  • the above calibration concepts may be applied to other types of fiber-optic current sensors, particularly Sagnac type interferometric current sensors [1] or polarimetric current sensors where the Faraday ef ⁇ fect is observed as a polarization rotation of linearly polarized light [8].
  • EP 1 512 981 8. Y. . Ying, Z. P. Wang, A. W. Palmer, K. T. V.
  • N number of sensing fiber loops

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Abstract

L'invention porte sur un capteur de courant à fibre optique, qui comprend une unité de mesure (1) comprenant une source de lumière (3) et un détecteur de lumière (7), ainsi qu'une tête de détection (2) comprenant une fibre de détection (11) enroulée autour d'un conducteur (12) et un retardateur (10) connecté à la fibre de détection (11). En fonction du courant du capteur de courant à fibre optique, le facteur d'échelle est décrit par le produit de deux fonctions de mise à l'échelle fe' et fs' pour l'unité de mesure (1) et la tête de détection (2), respectivement. Les données décrivant les fonctions de mise à l'échelle fe', fs' sont stockées dans une mémoire (22) de l'unité de mesure (1), tandis que les données décrivant la fonction de mise à l'échelle fs' sont également stockées dans une mémoire (23) de la tête de détection (2). La disposition de deux de ces dispositifs de mémoire (22, 23) permet de stocker les fonctions de mise à l'échelle fe' et fs' séparément, de façon à transformer ainsi l'unité de commande, ainsi que la tête de capteur, en des modules facilement remplaçables (1, 2).
PCT/EP2009/066977 2009-12-11 2009-12-11 Détection de courant à fibre optique à l'aide d'un capteur doté de sous-modules pouvant être échangés WO2011069558A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
AU2009356476A AU2009356476C1 (en) 2009-12-11 2009-12-11 Fiber-optic current sensing using a sensor with exchangeable sub-modules
JP2012542370A JP2013513785A (ja) 2009-12-11 2009-12-11 交換可能なサブモジュールを備えたセンサを使用する光ファイバ電流センサ
EP09796363.1A EP2510364B1 (fr) 2009-12-11 2009-12-11 Détection de courant à fibre optique à l'aide d'un capteur doté de sous-modules pouvant être échangés
CN200980162796.8A CN102667502B (zh) 2009-12-11 2009-12-11 使用具有能更换的子模块的传感器的光纤电流传感
PCT/EP2009/066977 WO2011069558A1 (fr) 2009-12-11 2009-12-11 Détection de courant à fibre optique à l'aide d'un capteur doté de sous-modules pouvant être échangés
US13/492,364 US9310399B2 (en) 2009-12-11 2012-06-08 Fiber-optic current sensing using a sensor with exchangeable sub-modules

Applications Claiming Priority (1)

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PCT/EP2009/066977 WO2011069558A1 (fr) 2009-12-11 2009-12-11 Détection de courant à fibre optique à l'aide d'un capteur doté de sous-modules pouvant être échangés

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JP2013513785A (ja) 2013-04-22
US9310399B2 (en) 2016-04-12
EP2510364B1 (fr) 2015-02-11
AU2009356476A1 (en) 2012-06-21
EP2510364A1 (fr) 2012-10-17
CN102667502A (zh) 2012-09-12
US20120283969A1 (en) 2012-11-08
AU2009356476B2 (en) 2014-08-07
AU2009356476C1 (en) 2014-11-06

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