WO2014101754A1 - Fibre optique à âmes multiples, dispositif de détection faisant appel à la fibre optique à âmes multiples et procédé d'exécution s'y rapportant - Google Patents

Fibre optique à âmes multiples, dispositif de détection faisant appel à la fibre optique à âmes multiples et procédé d'exécution s'y rapportant Download PDF

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Publication number
WO2014101754A1
WO2014101754A1 PCT/CN2013/090356 CN2013090356W WO2014101754A1 WO 2014101754 A1 WO2014101754 A1 WO 2014101754A1 CN 2013090356 W CN2013090356 W CN 2013090356W WO 2014101754 A1 WO2014101754 A1 WO 2014101754A1
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Prior art keywords
core
module
fiber
sensing
photodetector
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PCT/CN2013/090356
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English (en)
Chinese (zh)
Inventor
杜兵
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西安金和光学科技有限公司
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Publication of WO2014101754A1 publication Critical patent/WO2014101754A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/3537—Optical fibre sensor using a particular arrangement of the optical fibre itself
    • G01D5/35374—Particular layout of the fiber
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02042—Multicore optical fibres

Definitions

  • Multi-core optical fiber sensing device using the same, and operating method thereof
  • the invention relates to a novel multi-core optical fiber and a sensing device based on the multi-core optical fiber, in particular to a multi-core optical fiber comprising three cores or more than three cores, and a point type based on the multi-core optical fiber Or distributed fiber optic sensing devices and methods of operation thereof.
  • the "Twin-Core Based Temperature Sensing Device” patent discloses a temperature sensing device that uses a broadband source, a dual-core fiber, and a spectrum analyzer. When the temperature changes, the dual-core fiber The distance between the two cores also changes, resulting in a change in the wavelength of the optical signal of the core in which the broadband optical signal is injected is coupled to the core of the uninjected optical signal, and the change is detected by the optical spectrum analyzer, thereby completing
  • the temperature monitoring is simple in structure and wide in temperature monitoring, but its test parameters are single, the instrument is expensive, and distributed monitoring cannot be realized.
  • the existing distributed or quasi-distributed optical fiber sensing devices are mainly inspection devices for backscattered light in optical fibers, including the most commonly used optical time domain reflectometer (0TDR), fiber Raman temperature sensing device, Brillouin scattering sensing device and Bragg fiber grating sensing device.
  • TDR optical time domain reflectometer
  • the general backscattered light ratio is generally The power of the forward transmission optical signal is three to six orders of magnitude small, so the detection of backscattered light is difficult.
  • High and low real-time performance, and the maximum distance monitored by it is less than 100 km; while the quasi-distributed optical fiber sensing device composed of Bragg fiber grating has a strong reflected light signal, but the optical signal between the fiber gratings is easy.
  • Mutual interference so the number of fiber gratings is small, and the number of fiber gratings on each fiber is only a few dozen at most, which is difficult to achieve.
  • the existing optical fiber communication technology is developing rapidly, and the distance of its non-relay communication is easily more than several hundred kilometers. If the erbium-doped or Raman fiber amplification device is used, it can reach thousands of kilometers.
  • the intensity of the forward-propagating optical signal is much greater than that of the back-scattered optical signal. If there is a distributed sensing device that monitors the change of the optical signal based on forward transmission, the distributed optical fiber can be greatly extended. The distance monitored, however, such a device is not currently retrieved. Summary of the invention
  • the invention discloses a multi-core optical fiber and a sensing device based on the multi-core optical fiber
  • a core fiber is an optical fiber having three or more cores, such as a three-core fiber, a four-core fiber, or a five-core fiber.
  • the technical solution adopted by the present invention is:
  • a multi-core optical fiber comprising an inner cladding of an optical fiber and a core disposed in the inner cladding, wherein at least three cores are disposed on the inner cladding, wherein one core is a transmission core, and the other core is sensed
  • the core, each sensing core has a length not less than the length of the transmission core, and at least one of the sensing cores has a length greater than a length of the transmission core.
  • the inner cladding has an outer cladding layer, and the inner cladding layer has a refractive index greater than the outer cladding refractive index.
  • the cross section of the inner cladding along the radial direction of the optical fiber is a non-circular symmetric defect cladding.
  • the radial cross section of the non-circular symmetric defect cladding layer may be a rectangle, a part of a circular shape, an elliptical shape, a polygonal shape, etc., so that when the optical signal is propagated in the transmission core, part of the escaped optical signal does not Near the inner cladding and the outer edge of the outer cladding, the edge portion is propagated and consumed, but is reflected and passed through the transmission core or the sensing core, which is eventually captured by the core, thereby reducing the attenuation of optical signal transmission. .
  • the sensing core is arranged in a spiral shape in the inner cladding. Further, the sensing core is disposed around the transmission core in a spiral shape, and the transmission core is located at an axial center position of the spiral formed by the sensing core. Preferably, the transmission core is located at an axial center position of the entire optical fiber.
  • each of the sensing cores has a different distance from the transmission core. Therefore, different sensing cores acquire different optical signal sizes at the same physical quantity to be measured, and the comparison between the two can eliminate the error introduced by the light source or other non-measured physical quantity caused by the fluctuation of the optical signal size, thereby The test results of the intensity type optical fiber sensing device are more accurate and practical.
  • At least two of the sensing cores have different refractive index indices. Different sensing cores have different ability to capture optical signals and bind optical signals, which is convenient for eliminating test errors. Preferably, at least two of the sensing cores have different core diameters.
  • the multi-core optical fiber is an optical fiber composed of a polymer material, an optical fiber composed of multi-component glass, an optical fiber composed of fluoride glass, or an optical fiber composed of quartz glass.
  • a fiber-optic sensing device based on a multi-core fiber comprising a control module, a light source module, a coupling module, a photodetector module, and a processing module, wherein the control module is coupled to the light source module and controls the latter to emit an optical signal, and the light source module and the coupling
  • the module is connected, the coupling module is connected to one end of the multi-core fiber, and the multi-core fiber has at least three cores disposed on the inner cladding, wherein one core is transmitted
  • the fiber core, the other core is a sensing core, and at least one sensing core has a different length than the length of the transmitting core;
  • the coupling module is a transmission fiber that couples the optical signal only into the multi-core fiber.
  • the other end of the multi-core fiber is connected to the photodetector module, and the photodetector module simultaneously acquires optical signals transmitted in each core of the multi-core fiber, and the photodetector module Processing module connection.
  • the control module controls the light source module to emit a pulsed light signal, and the pulsed light signal is injected into the transmission core of one end of the multi-core fiber through the coupler Internal transmission
  • the pulsed optical signal is transmitted from one end of the multi-core optical fiber to the other end in the transmission core, and is acquired by the photodetector module disposed at the other end of the multi-core optical fiber, and the photodetector module converts the pulsed optical signal into The electrical signal is transmitted to the processing module;
  • the optical signal transmitted in the transmission core is partially coupled into two or more sensing cores and in each sensing fiber
  • the optical signal has different transmission speeds between the two, and the optical signals in the transmission core and the sensing core are sequentially arranged to reach the multi-core optical fiber.
  • One end is acquired by the photodetector module, and the photodetector module converts the acquired optical signal into an electrical signal and transmits it to the processing module.
  • the processing module calculates the size and position of the physical quantity to be measured according to the size and time interval of the electrical signal. Thereby completing the purpose of monitoring.
  • the fiber-optic sensing device based on the multi-core fiber is connected to the coupling module 2 at the other end of the multi-core fiber, and the coupling module 2 includes at least two channels, and each channel has no interference with each other.
  • the at least two sensing cores in the multi-core fiber are respectively connected to the two channels, and are respectively connected to the photodetector module 1 and the photodetector module 2 through the coupling module 2; the photodetector module 1 and the photodetector module 2 Connect to the processing module.
  • the control module controls the light source module to emit a pulsed light signal, and the pulsed light signal is injected into the transmission core of one end of the multi-core fiber through the coupler Internal transmission
  • the pulsed optical signal is transmitted from one end of the multi-core optical fiber to the other end in the transmission core, and the coupling module 2 is disposed at the other end of the multi-core optical fiber, and the coupling module 2 includes at least two channels, each of which The channels are not interfered with each other, and at least two sensing cores in the multi-core fiber are respectively connected to two channels, and are respectively connected to the photodetector module 1 and the photodetector module 2 through the coupling module 2;
  • the module 1 and the photodetector module 2 are connected to the processing module;
  • the transmission core is transmitted internally.
  • the transmitted optical signal is partially coupled into two or more sensing cores and transmitted within each sensing core, wherein at least two of the sensing optical signals transmitted within the core are respectively received by the photodetector module.
  • the two photodetector modules respectively convert the optical signal into an electrical signal and transmit it to the processing module, and the processing module eliminates the light source or the non-test according to the size of the two electrical signals and the comparison between the two.
  • a further preferred solution of the fiber-optic sensing device based on the multi-core fiber is that the other end of the multi-core fiber is connected to the coupling module three, and the coupling module three includes at least three channels, and each channel has no interference with each other. At least two sensing cores and a transmitting core in the multi-core fiber are respectively connected to three channels, and through the coupling module three respectively, a photodetector module, a photodetector module 2 and a photodetector module three The photodetector module 1, the photodetector module 2 and the photodetector module 3 are connected to the processing module.
  • the control module controls the light source module to emit a pulsed light signal, and the pulsed light signal is injected into the transmission core of one end of the multi-core fiber through the coupler Internal transmission
  • the pulsed optical signal is transmitted from one end of the multi-core optical fiber to the other end in the transmission core, and the coupling module 3 is disposed at the other end of the multi-core optical fiber, and the coupling module 3 includes at least three channels, each of which The channels are not interfered with each other, and at least two sensing cores and transmission cores in the multi-core fiber are respectively connected to three channels, and the photodetector module and the photodetector module are respectively connected through the coupling module three.
  • the second and the photodetector modules are connected; the photodetector module 1, the photodetector module 2 and the photodetector module 3 are connected to the processing module;
  • the optical signal transmitted in the transmission core is partially coupled into two or more sensing cores and in each sensing fiber In-core transmission, wherein at least two sensing cores and optical signals transmitted in the transmission core are respectively obtained by the photodetector module 1, the photodetector module 2 and the photodetector module 3, and the three photodetector modules respectively
  • the optical signal is converted into an electrical signal and transmitted to the processing module.
  • the processing module eliminates the influence of the light source or the unmeasured physical quantity according to the size of the electrical signal transmitted by the photodetector module 1 and the photodetector module 2 and the comparison between the two.
  • the light detector module 2 and the light detecting module 3 are one of an optical power meter, a photon counter, a spectrum analyzer, and a wavelength meter.
  • the light source module is one of a single wavelength light source, a multi-wavelength light source or a broadband light source.
  • the light reflecting device is a fiber grating, a light reflecting mirror or an optical fiber containing bubbles.
  • the forward monitoring technology enables the optical signal to be transmitted at a long distance, meeting the actual needs of natural gas pipelines and petroleum pipelines. Compared with the current Brillouin scattering monitoring device on the market, it has the advantages of low cost, long monitoring distance and high precision. , has a good market prospects.
  • the sensing fiber used has at least three cores, at least one of which is an optical signal transmission core, and at least one of the sensing cores has a length greater or smaller than the transmission core, the optical signal is The speed of transmission in the transmission core and the sensing core is different.
  • the multi-core fiber changes, such as microbending, bending, deformation, temperature change, and other physical quantity changes, the injected optical signal escapes and has a part.
  • the physical parameters of the two sensing cores are different, such as different distances from the transmission core, different refractive index indexes, and different lengths, coupling into the two from the transmission core
  • the optical signals of the sensing cores are also different.
  • the influence of the fluctuation of the light source fluctuations can be eliminated, the test error can be reduced, or the detection dynamics of the optical fiber sensing device can be improved.
  • Scope; or two different physical quantity parameters can be monitored at the same time, such as monitoring the temperature and strain parameters of a position at the same time, which increases the test parameters of the fiber-optic sensing device and extends the range of use.
  • the device injects optical signals into only one transmission core in the multi-core fiber and detects the optical signals in the other sensing core, this is a dark field monitoring technology with high precision and accuracy.
  • the multi-core optical fiber and the optical fiber sensing device based on the multi-core optical fiber have the advantages of simple structure, low cost, long monitoring distance, and can realize point or distributed monitoring and sensing, and have better performance. market expectation.
  • Embodiment 1 is a schematic structural view of Embodiment 1 of the present invention.
  • FIG. 2 is a schematic structural view of a cross section of the multi-core optical fiber of FIG. 1.
  • Fig. 3 is a structural schematic view showing the refractive index distribution of the multi-core fiber in the radial direction of Fig. 2.
  • Figure 4 is a partial schematic view of a multi-core fiber.
  • Figure 5 is a schematic cross-sectional view of a multi-core fiber with a defective inner cladding.
  • FIG. 6 is a schematic structural view of Embodiment 2 of the present invention.
  • FIG. 7 is a schematic structural view of Embodiment 3 of the present invention. Description of the reference signs:
  • the optical fiber sensing device comprises a control module 10, a light source module 12, a coupling module 13, and a light
  • the control module 10 is connected to the light source module 12 and controls the latter to emit an optical signal, preferably a pulsed optical signal
  • the light source module 12 and the coupling module 13 are connected by an auxiliary optical fiber 19
  • the coupling module 13 is connected to one end of the multi-core optical fiber 11.
  • the multi-core optical fiber 11 has at least three cores disposed on the inner cladding 23, one of the cores is a transmission core 15, and the other core is sensed.
  • the core 16 has at least one sensing core 16 having a different length than the length of the transmission core 15; the coupling module 13 is a coupling module for coupling the optical signal into the transmission core 15 in the multi-core optical fiber 11
  • the other end of the multi-core optical fiber 11 is connected to the photodetector module 7 , and the photodetector module 7 simultaneously acquires the optical signal transmitted in each core of the multi-core optical fiber 11 , and the photodetector module 1 7 is connected to the processing module 6.
  • the processing module 6 is connected to an output module 14, such as a terminal such as a display or a printer.
  • the multi-core optical fiber 11 When performing distributed monitoring, since the multi-core optical fiber 11 is used, there are at least three cores, at least one of which is an optical signal transmission core 15, and at least one of the sensing cores 16 has a length greater or smaller.
  • the core 15 When the core 15 is transported, the speed at which the optical signal is transmitted in the transmission core 15 and the sensing core 16 is different.
  • the multi-core optical fiber 11 changes, such as microbending, bending, deformation, etc., the pulsed light is injected.
  • the signal escapes and is partially coupled into the sensing core 16 of the near-uninjected optical signal, thereby being captured by the photodetector module 7 at the end of the multi-core optical fiber 11 due to the different transmission speeds of the optical signals in the two cores.
  • the detecting pulse light signal and the optical signal in the other sensing core 16 containing the physical quantity to be tested arrive at the photodetector module 7 in order, thereby distinguishing the size and time interval of different optical signals, according to the inclusion of the test
  • the size of the physical quantity of the optical signal can know the magnitude of the physical quantity to be measured, and the position of the physical quantity to be measured can be calculated according to the interval time between the detection pulse optical signal and the optical signal containing the physical quantity to be measured, thereby completing The purpose of distributed monitoring.
  • a sequence of a plurality of pulsed optical signals is formed.
  • the light source module 12 emits a pulsed light signal And continuous optical signals can be used for monitoring purposes.
  • the photodetector module 7 , the photodetector module 28 , and the photodetecting module 3 17 may be one of an optical power meter, a photon counter, a spectrum analyzer, and a wavelength meter.
  • the light source module 12 can be one of a single wavelength source, a multi-wavelength source or a broadband source.
  • a single-wavelength light source is a DFB laser, and its output optical signal has a stable wavelength and a large power.
  • the multi-wavelength source can be constructed from a plurality of DFB lasers.
  • the light source module 12 can be a single wavelength light source and a multi-wavelength light source.
  • the power of the pulse or continuous optical signal is collected, and the magnitude of the physical quantity to be measured can be calculated according to the power level; when the photodetector module 7 and the photodetector module 2
  • the light source module 12 is one of a multi-wavelength light source or a broadband light source, and the device of the present invention collects wavelength information of a pulse or a continuous optical signal, and Based on this information, the magnitude of the physical quantity to be measured can be derived.
  • the multi-core optical fiber is: an inner cladding 23 including an optical fiber and a core disposed in the inner cladding 23, and at least three cores are disposed on the inner cladding 23, wherein one core is a transmission core 21, and the other core is Sensing the core 16, each sensing core 16 has a length no less than the length of the transmission core, and at least one of the sensing cores 16 has a length greater than the length of the transmission core.
  • the multi-core fiber 11 has at least three cores disposed on the inner cladding 23, one of the cores is the transmission core 15, and the other cores are the sensing cores 16, and the length of each sensing core 16 is not It is larger than the length of the transmission core 15, and at least one of the sensing cores 16 has a length smaller than the length of the transmission core 15.
  • the inner cladding layer 23 has an outer cladding layer 24, and the inner cladding layer 23 has a refractive index greater than that of the outer cladding layer 24. Further, the inner cladding layer has an outer cladding layer, and the inner cladding layer has a refractive index index larger than that of the outer cladding layer.
  • the cross section of the inner cladding 23 along the radial direction of the multi-core optical fiber 11 is a non-circular symmetric defect cladding layer, as shown in FIG.
  • the radial cross section of the non-circular symmetric defect cladding layer may be a rectangle, a part of a circular shape, an elliptical shape, a polygonal shape, etc., so that when the optical signal is propagated in the transmission core 15, a part of the escaped optical signal does not It is absorbed near the edge portions of the inner cladding 23 and the outer cladding 24 and is consumed, but is reflected and passed through the transmission core 15 or the sensing core 16, which is eventually mostly captured by the core, thereby reducing Attenuation of optical signal transmission.
  • At least one of the sensing cores 16 is disposed in the inner cladding 23 in a spiral shape. Further, the pitches of the spirals are the same.
  • At least one of the sensing cores 16 is disposed in the inner cladding 23 in a spiral shape. Further, the pitches of the spirals are different.
  • the sensing core 16 is disposed around the transmission core 15 in a spiral shape.
  • the transmission core 15 is located at an axial center position of the spiral formed by the sensing core 16. The distances of the respective sensing cores 16 from the transmission core 15 are different.
  • the transmission core 15 is located at the axial center position of the entire multi-core optical fiber 11.
  • At least two of the sensing cores 16 have different refractive index indices.
  • At least two of the sensing cores 16 have different core diameters.
  • the multi-core optical fiber 11 is an optical fiber composed of a polymer material, an optical fiber composed of multi-component glass, an optical fiber composed of fluoride glass, or an optical fiber composed of quartz glass.
  • An optical fiber sensing device as shown in FIG. 6 is different from the first embodiment in that the other end of the multi-core optical fiber 11 is connected to the coupling module 3, and the coupling module 3 4 includes three channels, each of which The channels are not interfered with each other.
  • the at least two sensing cores 16 and the transmission cores 15 in the multi-core optical fiber 11 are respectively connected to three channels, and are respectively connected to the photodetector module through the coupling module 3 4
  • the photodetector module 2 and the photodetector module 3 are connected; the photodetector module 7 and the photodetector module 2 and the photodetector module 3 are connected to the processing module 6.
  • the control module 10 controls the light source module 12 to emit a pulsed light signal, and the pulsed light signal is injected into the multi-core through the coupler 13 Transmission in the transmission core 15 at one end of the optical fiber 11;
  • the pulsed optical signal is transmitted from one end of the multi-core optical fiber 11 to the other end in the transmission core 15, and the coupling module 3 is disposed at the other end of the multi-core optical fiber 11, and the coupling module 3 4 includes at least three Channels, each channel having no interference with each other, at least two sensing cores 16 and transmission cores 15 in the multi-core fiber 11 are respectively connected to three channels, and respectively through the coupling module three 4
  • the photodetector module 7 , the photodetector module 2 8 and the photodetector module 3 5 are connected; the photodetector module 7 , the photodetector module 2 8 and the photodetector module 3 5 are connected to the processing module 6;
  • the optical signal transmitted in the transmission core 15 is partially coupled into two or more sensing cores 16 and The sensing core 16 transmits, wherein at least two of the sensing core 16 and the optical signal transmitted in the transmission core 15 are respectively acquired by the photodetector module 7, the photodetector module 2, and the photodetector module 3
  • the three photodetector modules respectively convert the optical signal into an electrical signal and transmit it to the processing module 6.
  • the processing module 6 compares the size of the electrical signal transmitted by the photodetector module 7 and the photodetector module 2 and the comparison between the two.
  • the error introduced by the change of the optical signal power caused by the influence of the light source or the unmeasured physical quantity is eliminated, and then the time interval of the electrical signal transmitted by the photodetector module 3 5 is used to calculate the magnitude and position of the physical quantity to be measured, and Complete the purpose of monitoring.
  • the two sensing cores 16 can be respectively connected to the photodetector module by the module.
  • Detector module 2 8 connection can also achieve the error introduced by eliminating the change of optical signal, and calculation The size and relative position of the physical quantity to be measured are obtained, and the purpose of monitoring is completed.
  • an optical fiber sensing device based on a multi-core optical fiber 11 includes a control module 10 , a light source module 12 , a coupling module 13 , and a photodetector module 7 .
  • the control module 10 is connected to the light source module 12 and controls the latter to emit an optical signal
  • the light source module 12 is connected to the coupling module 13
  • the coupling module 13 is connected to one end of the multi-core optical fiber 11
  • the multi-core optical fiber 11 has at least three cores disposed on the inner cladding 23, one of the cores is a transmission core 15, and the other core is a sensing core 16, and at least one of the sensing cores 16 has a length and a transmission fiber.
  • the length of the core 15 is different;
  • the coupling module 13 has at least two channels, and each channel has no interference with each other, and one of the channels is a transmission fiber that causes the optical signal emitted by the light source module 12 to be coupled only into the multi-core fiber 11.
  • the core 15 is connected to the sensing core 16 of the multi-core fiber 11 , and the transmitted optical signal in the sensing core 16 is connected to the photodetector module through the coupling module 13 , and the light is detected. 7 acquires the module 16 transmits a sensed core optical signal, a photodetector ⁇ module 6 is connected with the processing module; the other end of the multi-core optical fiber 11 of the light reflecting means 33 is disposed.
  • the light reflecting means 33 is a fiber grating, a light reflecting mirror or an optical fiber containing bubbles.
  • the coupling module 13 disposed at one end of the multi-core optical fiber 11 includes at least three channels, each of which has no interference with each other, and at least two sensing fibers in the multi-core optical fiber 11
  • the core 16 and the transmission core 15 are respectively connected to three channels, and are respectively connected to the photodetector module 7, the photodetector module 2 and the light source module 12 through the coupling module 13; the photodetector module 7 and the light detecting
  • the module module 2 is connected to the processing module 6; the photodetector module and the photodetector module 2 8 respectively acquire the optical signals transmitted in the sensing core 16 of the multi-core optical fiber 11.

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Abstract

L'invention concerne une fibre optique à âmes multiples et un capteur basé sur la fibre optique à âmes multiples et un procédé d'exécution s'y rapportant. La fibre optique à âmes multiples comprend une âme fibreuse de transmission (15) et une pluralité d'âmes fibreuses de détection (16), la longueur de l'âme fibreuse de détection (16) n'étant pas inférieure à la longueur de l'âme fibreuse de transmission (15). Le capteur basé sur la fibre optique à âmes multiples comprend un module de source lumineuse (12), la fibre optique à âmes multiples et des modules de détecteur optique (5, 7, 8). Le module de source lumineuse (12) injecte des signaux optiques dans l'âme fibreuse de transmission (15). Les modules de détecteur optique (5, 7, 8) détectent la variation des signaux optiques dans la totalité ou une partie des âmes fibreuses de détection (16), éliminent les interférences par la comparaison de la réponse de plus de deux âmes fibreuses de détection (16) avec les quantités physiques à détecter dans une seule et même position, et améliorent la précision de test. L'invention décrit également un procédé d'exécution correspondant pour le capteur basé sur la fibre optique à âmes multiples.
PCT/CN2013/090356 2012-12-26 2013-12-24 Fibre optique à âmes multiples, dispositif de détection faisant appel à la fibre optique à âmes multiples et procédé d'exécution s'y rapportant WO2014101754A1 (fr)

Applications Claiming Priority (2)

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CN201210573292 2012-12-26
CN201210573292.9 2012-12-26

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WO2014101754A1 true WO2014101754A1 (fr) 2014-07-03

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Cited By (4)

* Cited by examiner, † Cited by third party
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WO2016202857A1 (fr) 2015-06-16 2016-12-22 Karlsruher Institut für Technologie Dispositif et procédé pour la détermination d'une déformation d'une structure flexible tridimensionnelle
WO2020172413A1 (fr) 2019-02-20 2020-08-27 Humanetics Innovative Solutions, Inc. Système de fibre optique ayant une structure d'âme hélicoïdale pour la détection de forces au cours d'un essai de collision
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