EP1141663A1 - Detecteurs a reseaux de bragg dans une fibre optique, pour la mesure de grandeurs physiques - Google Patents

Detecteurs a reseaux de bragg dans une fibre optique, pour la mesure de grandeurs physiques

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Publication number
EP1141663A1
EP1141663A1 EP99967876A EP99967876A EP1141663A1 EP 1141663 A1 EP1141663 A1 EP 1141663A1 EP 99967876 A EP99967876 A EP 99967876A EP 99967876 A EP99967876 A EP 99967876A EP 1141663 A1 EP1141663 A1 EP 1141663A1
Authority
EP
European Patent Office
Prior art keywords
grating
bragg
specific
optical
wavelengths
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99967876A
Other languages
German (de)
English (en)
Inventor
Mario Bechtold
Peter KRÄMMER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1141663A1 publication Critical patent/EP1141663A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • G01D5/35383—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 using multiple sensor devices using multiplexing techniques

Definitions

  • the invention relates to a Bragg grating sensor arrangement for scanning at least one physical variable.
  • the physical quantity to be scanned can be, for example, a tensile stress, the temperature, a pressure, ultrasound, an acceleration, a strong magnetic field and / or a force.
  • At least one optical Bragg grating with a grating-specific Bragg wavelength, which is reflected by this grating when it is contained in the radiation transmitted on the transmission path, is arranged on at least one optical transmission path for transmitting optical radiation. while any wavelength contained in this radiation other than this Bragg wavelength passes through the grating.
  • the Bragg wavelength of a grating varies depending on a change in the physical quantity acting on this grating.
  • the optical transmission path consists of an optical fiber in which a Bragg grating is realized by periodic fluctuations in the refractive index.
  • Bragg gratings are arranged with mutually different grating-specific Bragg wavelengths and each of which is available for transmitting an optical radiation generated by a common optical radiation source.
  • a special implementation of a particular embodiment has a tunable optical radiation source for generating narrow-band optical radiation at a specific wavelength, and the source is controlled so that the specific wavelength changes over time and thereby passes through a wavelength range which covers the various grating-specific Bragg wavelengths contains all Bragg gratings in the optical fiber (s), so that the specific wavelength is at least once in time at each of these grating-specific Bragg wavelengths.
  • the specific wavelength which is varied in time in this way is coupled into the optical fiber and transmitted in the fiber. Since the transmitted wavelength is at different times at the grating-specific Bragg wavelength of each Bragg grating and is thereby reflected by this grating, a time sequence of different reflected grating-specific Bragg wavelengths arises.
  • the tunable radiation source for generating the narrow-band optical radiation at the specific wavelength consists in one case, for example, of an optical beam.
  • the wavelength scanner is controlled to change the specific wavelength over time with the constantly monotonically changing signal of a ramp generator, which causes the specific wavelength to pass through the entire wavelength range of the broadband radiation again and again and thus the desired temporally varied specific wavelength arises, which is coupled into the optical fiber and transmitted in the fiber.
  • the tunable radiation source for generating the narrowband optical radiation at the specific wavelength comprises, for example, an optical radiation source for generating a broadband optical
  • a tunable Fabry-Perot filter which is connected downstream of the broadband source and a tunable interferometric wavelength scanner, which in turn is connected after the Fabry-Perot filter.
  • the wavelength range of the broadband radiation is set, each of these subregions containing the grating-specific Bragg wavelength each of one of the Bragg gratings alone. If this filter is set to such a partial area, it emits optical radiation which contains only this partial area. For the time sequential setting of the subareas, the Filter driven with a step-wise monotonically changing signal of a step signal generator.
  • the tunable interferometric wavelength scanner generates from each radiation set by the Fabry-Perot filter on a narrow-band wavelength sub-region a narrow-band radiation which is at a specific wavelength.
  • the wavelength scanner is controlled in each sub-area so that the specific wavelength changes in time in this sub-area and passes through this sub-area.
  • the wavelength scanner is activated with a signal from a ramp generator, which changes monotonically over time in each set sub-area.
  • the narrow-band wavelength sub-ranges are set one after the other in time and the specific wavelength when passing through each of these sub-ranges meets the grating-specific Bragg wavelength contained in this sub-range once again, a specific wavelength is at different times at the grating-specific Bragg wavelength each Bragg grating and thus forms the desired time-varying wavelength that is coupled into the optical fiber and transmitted in the fiber
  • a receiver device receives and detects the temporal sequence of the grating-specific Bragg wavelengths reflected by the Bragg gratings, which is generated in the fiber during the transmission of the coupled, time-varying, determined wavelength. Since the grating-specific Bragg wavelength of each Bragg grating varies with a change in the physical size acting on the grating, the detected reflected Bragg wavelength of each grating is a measure of the actual value of the physical size at the location of this grating.
  • the receiver device can have a broadband optical input, the bandwidth of which comprises the grating-specific Bragg wavelengths of all Bragg gratings. Such a broadband input can be implemented, for example, by a photo diode.
  • Another special implementation of a known embodiment has an optical radiation source for generating a broadband optical radiation with a wavelength range which contains the grating-specific Bragg wavelengths of all Bragg gratings in at least one optical fiber at the same time.
  • This broadband radiation is coupled into the optical fiber and transmitted in the fiber. Since this transmitted radiation contains the grating-specific Bragg wavelengths of all Bragg gratings at the same time, an optical radiation arises which contains the grating-specific Bragg wavelengths reflected on all Bragg gratings of the fiber essentially simultaneously, in contrast to the one specific implementation of the particular embodiment .
  • a receiver device receives all the detected grating-specific Bragg wavelengths and detects them. Since the grating-specific Bragg wavelength of each Bragg grating also varies with a change in the physical size acting on the grating, the detected reflected Bragg wavelength of each grating is a measure of the actual value of the physical size at the location of this grating.
  • This receiver device must be able to separate the simultaneously received reflected grating-specific Bragg wavelengths from one another and therefore requires a narrow-band optical input which only detects one wavelength at a time.
  • this device have a spectrometer that scans the simultaneously present reflected grating-specific Bragg wavelengths one after the other.
  • the invention is based on the object of specifying a Bragg grating sensor arrangement for scanning at least one specific physical variable, which has at least one optical transmission path for transmitting optical radiation and at least two optical Bragg gratings arranged one after the other in the transmission path and having different grating-specific Bragg gratings. Has wavelengths and which is particularly inexpensive to implement especially when using two or more such optical transmission paths.
  • the Bragg grating sensor arrangement comprises an optical radiation source for generating optical radiation, the specific optical wavelength for each Bragg grating that is assigned to this grating alone, at least close to the grating-specific Bragg wavelength this grating lies and has an individual variation in time within a wavelength range assigned only to this grating, and for the simultaneous coupling of all these time-varying specific wavelengths into the transmission path for simultaneous transmission in this way.
  • This radiation source is similar to the known radiation sources described above, in which the different temporally varied specific optical wavelengths are coupled into the transmission path for transmission in this way not at the same time, but successively in time, a tunable radiation source, but it is constructed and operated differently like these well-known radiation sources.
  • this radiation source of the sensor arrangement according to the invention has the advantage that each particular optical wavelength that is contained in the radiation generated by this source and each is assigned to one of the Bragg gratings only has to pass through a narrow wavelength range during its variation over time, which is small relative to a large wavelength range containing all of these specific wavelengths and only has to contain the grating-specific Bragg wavelength of the Bragg grating to which this specific wavelength is assigned alone.
  • this radiation source advantageously eliminates the need for a wavelength scanner or Fabry-Perot filter with a large tuning range, which extends over a large wavelength range containing all grating-specific Bragg wavelengths of all Bragg gratings.
  • the radiation source advantageously only requires an optical source which generates all the specific optical wavelengths assigned to a Bragg grating at the same time, and a device downstream of this source for varying each of these wavelengths in time in a narrow wavelength range.
  • the optical source can advantageously consist of an inexpensive conventional broadband source and the device for varying each specific wavelength to be varied can have a tunable wavelength scanner, which can only be tuned in the respective narrow wavelength range and therefore does not make high demands with regard to tunability and is inexpensive can be.
  • the respective tunable wavelength scanner can be an interferometric wavelength scanner controlled by the signal of a ramp generator, as is known from the document mentioned at the beginning.
  • the optical radiation source has a broadband source for generating an optical radiation with a continuous bandwidth, in which all the specific optical wavelengths to be generated and individually varied in time are contained, and for each specific wavelength to be generated each have an individually tunable Bragg grating with a grating-specific Bragg wavelength that defines this specific wavelength, the broadband radiation being supplied to all these Bragg gratings at the same time and all gratings reflecting their grating-specific Bragg wavelengths and essentially simultaneously as being from the radiation source generate certain wavelengths.
  • Each of these tunable Bragg gratings can be tuned using a piezo actuator.
  • this arrangement comprises a receiver device for receiving and detecting all grating-specific Bragg wavelengths which are reflected at the same time by the Bragg gratings during the simultaneous transmission of all time-varying specific wavelengths on the transmission path.
  • "Essentially” means that optical time differences and the temporal variation of each specific optical wavelength assigned to a grating alone are negligible in the wavelength range assigned only to this grating.
  • the receiver device of the arrangement according to the invention can have a spectrometer with a narrow-band optical input that detects the reflected grating specific Bragg wavelengths sequentially sampled.
  • a particular advantage of the sensor arrangement according to the invention can be seen in the novel working principle of the radiation source of this arrangement, according to which the specific wavelengths which are simultaneously contained in the optical radiation generated by this source are individually varied in time.
  • This individual variation offers the possibility of temporally varying at least two specific optical wavelengths different from one another in the optical radiation generated by the radiation source and to be coupled into the at least one optical transmission path, with frequencies different from one another.
  • the grating-specific Bragg wavelength reflected by a Bragg grating advantageously appears at the frequency with which the specific optical wavelength assigned to this grating and coupled into the optical transmission path is varied over time within the relevant narrow wavelength range. If two specific wavelengths, which are assigned to two different Bragg gratings, are varied with mutually different frequencies, then the grating-specific Bragg wavelengths reflected by these gratings appear with mutually different frequencies and can thus be distinguished from one another.
  • the receiver device of the sensor arrangement according to the invention can have a broadband optical input with a bandwidth that includes all grating-specific Bragg wavelengths that appear with different frequencies.
  • a broadband input can advantageously be realized with a conventional photodetector and can therefore be cheap. This is particularly advantageous in the case of a sensor arrangement with two or more optical transmission paths, since only one cheap ger broadband optical input and no expensive spectrometer must be available.
  • the receiver device has means for frequency-separating the reflected grating-specific Bragg wavelengths with the different frequencies, which can be realized with conventional and inexpensive electronic means.
  • a further advantage of the sensor arrangement according to the invention lies in the higher sampling rate compared to the conventional arrangements, which have a tunable optical radiation source for generating certain optical wavelengths which are successively coupled into the optical transmission path.
  • FIG. 1 is a block diagram schematic representation of an embodiment of the arrangement according to the invention
  • Figure 3 is a block diagram schematic representation of an embodiment of an optical radiation source of the arrangement according to the invention.
  • the grating-specific Bragg wavelength ⁇ l, ⁇ 2, ... or ⁇ N of each grating 11, 12, ... or IN varies depending on a change ⁇ X in the physical effects acting on this grating 11, 12, ... or IN Size X.
  • Transmission path 1 transmitted radiation is included, this wavelength ⁇ l, ⁇ 2, ... or ⁇ N is reflected by this grating 11, 12, ... or IN alone.
  • An optical radiation source 2 generates an optical radiation P with a wavelength spectrum shown in FIG. 2, in which the intensity I of the radiation P is plotted over the wavelength ⁇ .
  • the radiation P has a number N of spectral lines at the same time, each of which lies at a different optical wavelength ⁇ Oi, ⁇ 02,... ⁇ ON, which is different from N and is represented by a narrow-band intensity curve 100.
  • Each of the N wavelengths ⁇ Oi, ⁇ 02, ... ⁇ ON present in the radiation P is assigned to a Bragg grating 11, 12, ... or IN alone and is at least close to the grating-specific Bragg wavelength ⁇ l, ⁇ , ... ⁇ N of this grid 11, 12, ... or IN and is within a world assigned only to this grid 11, 12, ... or IN length range ⁇ Ol, ⁇ 02, ... or ⁇ ON varies individually over time.
  • All N different specific optical wavelengths ⁇ Oi, ⁇ 02, ... ⁇ ON of the radiation P are temporally varied with mutually different frequencies ⁇ l, ⁇ 2, ... ⁇ N, so that each specific wavelength ⁇ Oi, ⁇ 02, ... or ⁇ ON with a other frequency ⁇ l, ⁇ > 2, ... or ⁇ N is varied individually in time.
  • FIG. 3 shows an example of a particularly advantageous embodiment of the optical radiation source 2 for the sensor arrangement according to FIG. 1.
  • the radiation source 2 has a broadband source 22 for generating an optical radiation PO with a continuous bandwidth ⁇ O, in which all of of the radiation source 2 to be generated and individually varied in time with certain optical wavelengths ⁇ Oi, ⁇ 02, ... ⁇ ON.
  • ⁇ Oi, ⁇ 02, ... or ⁇ ON there is an individually tunable Bragg grating 221, 222, ... or 22N with a wavelength ⁇ Oi, ⁇ 02, ... or ⁇ ON that defines this specific wavelength grating-specific Bragg wavelength available.
  • the broadband radiation PO from the source 22 is supplied to all of these Bragg gratings 221, 222, ... 22N at the same time and all gratings 221, 222, ... 22N reflect their grating-specific Bragg wavelengths and simultaneously output them as the specific wavelengths ⁇ Oi, ⁇ 02, ... ⁇ ON to be generated by the radiation source 2.
  • the specific optical wavelength ⁇ Oi, ⁇ 02, ... or ⁇ ON generated by such a tunable Bragg grating 221, 222, ... or 22N can be varied in time by tuning this grating 221, 222, ... or 22N .
  • Each tunable Bragg grating 221, 222, ... or 22N can be tuned by a piezo actuator 231, 232, ... 23N, each of which has an electrical control signal UI, U2, ... UN, for example an electrical one Voltage, can be controlled. If a control signal UI, U2, ... or UN fluctuates at a frequency ⁇ l, ⁇ 2, ... or ⁇ N, the Bragg grating 221 that can be tuned by the signal UI, U2, ... or UN belonging to this signal , 222, ... or 22N generated certain optical wavelength ⁇ Oi, ⁇ 02, ... or ⁇ ON with this frequency ⁇ l, ⁇ 2, ... or ⁇ N varies with time.
  • the specific optical wavelength ⁇ Oi, ⁇ 02, ... or ⁇ ON generated by a tunable Bragg grating 221, 222,... Or 22N and reflected back in the direction of the broadband source 22 can be fed from the beam path to the one generated by this source 22 Radiation PO using an optical
  • Coupler 201, 202, ... or 20N are coupled out, which can advantageously be a simple 2 x 2 coupler.
  • each broadband source 22 is formed in an optical fiber 220, into which a radiation component of the radiation PO generated by the broadband source 22 is coupled, which is fed in this fiber 220 to this grating 221, 222,... Or 22N, and the specific wavelength ⁇ Oi, ⁇ 02, ... or ⁇ ON generated by this grating 221, 222, ... or 22N is coupled out of the fiber 220 by a coupler 201, 202, ... 20N arranged in this fiber 220 .
  • the time-varying specific wavelengths ⁇ Oi, ⁇ 02,... ⁇ ON generated by this source 2 are simultaneously coupled into each transmission path 1 for simultaneous transmission on this path 1.
  • Radiation source 2 can be viewed, to which the radiation P is supplied and which divides this radiation P into M radiation components Pl, P2,... PM.
  • Each radiation component P1, P2,... Or PM contains all of the individual wavelengths ⁇ Oi, ⁇ 02,... ⁇ ON, which are individually varied in time, and is coupled into one and only this one of the M transmission paths 1.
  • the radiation P is divided into M equal radiation components Pl, P2, ... PM with the respective intensity I / M.
  • the grating-specific Bragg wavelengths ⁇ l, ⁇ , ... ⁇ N reflected by the Bragg gratings 11, 12, ... IN of a transmission path 1 are returned in this way 1 in the direction of the radiation source 2 and meet one arranged in this path 1 optical coupler 10 for decoupling these wavelengths ⁇ l, ⁇ , ... ⁇ N from this path 1 and essentially simultaneously feeding these wavelengths ⁇ l, ⁇ 2, ... ⁇ N to an optical input 30 of a receiver device 3 for receiving and detecting all of these wavelengths ⁇ l, ⁇ 2, ... ⁇ N.
  • An optical coupler 10 can e.g. can be easily realized by a 2 x 2 coupler.
  • an optical coupler 10 is arranged in each of these paths, to which an optical input 30 of the receiver device 3 is assigned, to which the grating-specific Bragg reflected in this path 1 and decoupled by this coupler 10 is assigned.
  • Wavelengths ⁇ l, ⁇ 2, ... ⁇ N are supplied essentially simultaneously.
  • the number N of Bragg gratings 11, 12,... IN in a transmission path 1 can be the same or different for different paths 1.
  • grating-specific Bragg wavelengths ⁇ l, ⁇ 2, ... ⁇ N can be the same or different for different paths.
  • the receiver device 3 is designed in such a way that it detects the grating-specific Bragg wavelengths ⁇ l, ⁇ 2,. ⁇ ON on the relevant transmission path 1 are reflected by the Bragg gratings 11, 12, ... IN this path 1 essentially simultaneously.
  • the receiver device 3 has a device 31 in which the reflected grating-specific Bragg wavelengths ⁇ l, ⁇ 2, ... ⁇ N are separated in terms of frequency, each of which occurs with a different frequency ⁇ l, ⁇ 2, ... or ⁇ N and is uniquely coded by this frequency ⁇ l, ⁇ 2, ... or ⁇ N.
  • the frequency-related separation of these coded wavelengths ⁇ l, ⁇ 2, ... ⁇ N can be done with conventional means, for example with frequency filters.
  • Each of the separate coded wavelengths ⁇ l, ⁇ 2, ... ⁇ N can be individually phase-detected in a conventional manner and the value of the specific physical quantity X can be determined at the location of the Bragg grating to which this coded wavelength is assigned. By comparing this value of the determined physical quantity X with a constant reference value of this quantity X, a change ⁇ X of this quantity X can be determined at the location of this grid.
  • a device for individual phase detection can, for example, an N- Be channel phase detector, which is part of the device 31, for example, in which the coded frequency wavelengths ⁇ l, ⁇ 2, ... ⁇ N are separated.
  • a control signal from the optical radiation source 2 or an optical transmission path with two or more Bragg gratings of different grating-specific Bragg wavelengths, for example one or more of the M transmission paths 1 in FIG. 1, can be used.
  • a control signal for establishing a reference value of the optical radiation source 2 can, for example, be an N-channel phase reference signal 300, which e.g. emitted by the N-channel phase detector in the device 31 and, for example, fed to a control device 21 for controlling the optical radiation source 2.
  • an optical transmission path with Bragg gratings used to determine a reference value can be in temperature equilibrium with the radiation source.
  • Each optical input 30 can advantageously be a broadband input with a bandwidth which comprises all of the reflected grating-specific Bragg wavelengths ⁇ l, ⁇ 2, ... ⁇ N that appear with the mutually different frequencies ⁇ l, ⁇ 2, ... ⁇ N.
  • a broadband input 30 can consist of a photodetector, for example a photodiode.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Transform (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

Dispositif détecteur à réseaux de Bragg qui comporte plusieurs réseaux de Bragg (1i, i = 1,2, ... N) disposés les uns après les autres dans une fibre optique (1) et ayant des longueurs d'onde de Bragg (μi) différentes. Dans la fibre, des longueurs d'onde (μ0i), proches de ces longueurs d'onde de Bragg, qui sont modifiées individuellement à l'aide de fréquences (φi) différentes les unes des autres, sont transmises simultanément aux réseaux et les longueurs d'onde de Bragg codées en fréquence et pour l'essentiel simultanément réfléchies par les réseaux sont séparées selon la fréquence et décodées en phase. Le dispositif selon la présente invention est peu onéreux, en particulier lorsqu'il possède plusieurs fibres.
EP99967876A 1998-12-23 1999-12-09 Detecteurs a reseaux de bragg dans une fibre optique, pour la mesure de grandeurs physiques Withdrawn EP1141663A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19859994 1998-12-23
DE19859994 1998-12-23
PCT/DE1999/003937 WO2000039531A1 (fr) 1998-12-23 1999-12-09 Detecteurs a reseaux de bragg dans une fibre optique, pour la mesure de grandeurs physiques

Publications (1)

Publication Number Publication Date
EP1141663A1 true EP1141663A1 (fr) 2001-10-10

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EP99967876A Withdrawn EP1141663A1 (fr) 1998-12-23 1999-12-09 Detecteurs a reseaux de bragg dans une fibre optique, pour la mesure de grandeurs physiques

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EP (1) EP1141663A1 (fr)
JP (1) JP2002533708A (fr)
KR (1) KR20020000759A (fr)
CN (1) CN1335931A (fr)
PL (1) PL349373A1 (fr)
WO (1) WO2000039531A1 (fr)

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GB2372100B (en) * 2001-02-13 2003-04-16 Marconi Caswell Ltd Optical Waveguide Bragg Grating System
GB0111295D0 (en) * 2001-05-09 2001-06-27 Europ Economic Community Sensor system and method incorporating fibre bragg gratings
CN100360904C (zh) * 2005-06-21 2008-01-09 电子科技大学 一种长距离分布式布拉格光纤光栅传感系统
CN102080986B (zh) * 2009-11-30 2012-11-14 同方威视技术股份有限公司 光纤光栅振动传感部件、光纤光栅振动传感装置、测振系统及方法
CN102169392B (zh) * 2010-02-26 2013-01-23 深圳华映显示科技有限公司 触控面板及触控感测方法
CN102221431B (zh) * 2011-03-10 2013-08-14 西北工业大学 一种光纤布拉格光栅式杆力传感器
JP5657444B2 (ja) * 2011-03-23 2015-01-21 東京エレクトロン株式会社 温度測定装置及び温度測定方法
JP2013104812A (ja) 2011-11-15 2013-05-30 Olympus Corp 光学式センサ
US20130322490A1 (en) * 2012-05-31 2013-12-05 Kidde Technologies, Inc. Optical fiber sensing system
CN103512510B (zh) * 2013-10-23 2016-04-13 中国电子科技集团公司第三十四研究所 基于窄带扫描光源的光纤光栅传感系统及运行方法
KR102591050B1 (ko) * 2021-02-16 2023-10-19 주식회사 휘라포토닉스 스마트팜에 이용되는 센서 시스템

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US5426297A (en) * 1993-09-27 1995-06-20 United Technologies Corporation Multiplexed Bragg grating sensors
US5757487A (en) * 1997-01-30 1998-05-26 The United States Of America As Represented By The Secretary Of The Navy Methods and apparatus for distributed optical fiber sensing of strain or multiple parameters
US5818585A (en) * 1997-02-28 1998-10-06 The United States Of America As Represented By The Secretary Of The Navy Fiber Bragg grating interrogation system with adaptive calibration

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Publication number Publication date
KR20020000759A (ko) 2002-01-05
PL349373A1 (en) 2002-07-15
JP2002533708A (ja) 2002-10-08
CN1335931A (zh) 2002-02-13
WO2000039531A1 (fr) 2000-07-06

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