WO2003010503A1 - Tete de mesure pour des tests d'attenuation sur des fibres optiques - Google Patents

Tete de mesure pour des tests d'attenuation sur des fibres optiques Download PDF

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Publication number
WO2003010503A1
WO2003010503A1 PCT/IB2002/002898 IB0202898W WO03010503A1 WO 2003010503 A1 WO2003010503 A1 WO 2003010503A1 IB 0202898 W IB0202898 W IB 0202898W WO 03010503 A1 WO03010503 A1 WO 03010503A1
Authority
WO
WIPO (PCT)
Prior art keywords
measuring head
sensor
head according
ferrule
measuring
Prior art date
Application number
PCT/IB2002/002898
Other languages
German (de)
English (en)
Inventor
Leo Bühler
Original Assignee
Schleuniger Holding 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 Schleuniger Holding Ag filed Critical Schleuniger Holding Ag
Priority to DE10296967T priority Critical patent/DE10296967D2/de
Publication of WO2003010503A1 publication Critical patent/WO2003010503A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
    • G01M11/31—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter and a light receiver being disposed at the same side of a fibre or waveguide end-face, e.g. reflectometers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
    • G01M11/33—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face
    • 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
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G02B6/38—Mechanical coupling means having fibre to fibre mating means
    • G02B6/3807—Dismountable connectors, i.e. comprising plugs
    • G02B6/3833—Details of mounting fibres in ferrules; Assembly methods; Manufacture
    • G02B6/3834—Means for centering or aligning the light guide within the ferrule
    • G02B6/3843—Means for centering or aligning the light guide within the ferrule with auxiliary facilities for movably aligning or adjusting the fibre within its ferrule, e.g. measuring position or eccentricity
    • 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
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4219—Mechanical fixtures for holding or positioning the elements relative to each other in the couplings; Alignment methods for the elements, e.g. measuring or observing methods especially used therefor
    • G02B6/422—Active alignment, i.e. moving the elements in response to the detected degree of coupling or position of the elements
    • G02B6/4225—Active alignment, i.e. moving the elements in response to the detected degree of coupling or position of the elements by a direct measurement of the degree of coupling, e.g. the amount of light power coupled to the fibre or the opto-electronic element
    • 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
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4219—Mechanical fixtures for holding or positioning the elements relative to each other in the couplings; Alignment methods for the elements, e.g. measuring or observing methods especially used therefor
    • G02B6/422—Active alignment, i.e. moving the elements in response to the detected degree of coupling or position of the elements
    • G02B6/4226—Positioning means for moving the elements into alignment, e.g. alignment screws, deformation of the mount

Definitions

  • the invention relates to a measuring head for attenuation tests on optical fibers according to the preamble of the independent claim.
  • the object of the invention is to provide a measuring head, by means of which damping tests can be carried out on optical fibers, while an optical fiber end is finished in a ferrule for optical fiber connections.
  • the sensor must always be automatically and precisely positioned at the end of the fiber optic cable so that the measurement results cannot be disturbed by boundary conditions.
  • FIG. 1 shows a measuring head according to the invention in a sectional side view
  • FIG. 2 shows a ferrule holder for this purpose in a perspective view
  • Fig. 3 shows the ferrule holder in an exploded view.
  • Fig. 4 shows a transmission link
  • a measuring head according to the invention for attenuation tests on optical fibers consists of two interconnected basic units. This is a holder 1 for a ferrule equipped with an optical waveguide and a sensor holder 2. An optical waveguide end which is fastened in a ferrule is inserted into the ferrous holder 1 for the attenuation test and fixed therein. A suitable sensor 3 is then moved in the sensor holder 2 from a rest position into a measurement position.
  • the measuring position must always be fixable geometrically exactly in relation to the end of the optical fiber. This is guaranteed by the features described below.
  • the ferrule holder 1 has a base plate 5 with a continuous ferrule holder 14. It comprises at least three clamping jaws 11, which come to rest radially on an inserted ferrule. The ferrule is centered and held concentrically fixed by the at least three clamping jaws 11. At least one sliding element 12 is radially displaceable and has a stop 121. The free end of the ferrule comes to rest against this stop. This stop 121 together with the clamping jaws 11 guarantees the exact positioning of the ferrule in the ferrule holder 1.
  • All jaws 11 and sliding elements 12 are each provided with a cam. These cams 13 each engage in a cam track 41, 41 'in a control disk 4.
  • the control disk 4 is rotatably mounted in, on or on the ferrule holder 1. It is controlled and operated by a servo drive.
  • the servo drive can be a stepper motor, a pneumatic actuator or the like.
  • the first cam tracks 41 are designed for the actuation of the clamping jaws 11 and the second cam tracks 41 'for the actuation of the sliding elements 12. In an insertion position for inserting an equipped ferrule, the clamping jaws 11 are pushed radially outwards and open the opening for the ferrule.
  • the sliding elements 12 are in a radially inner position and thereby form a stop for the ferrule.
  • the ferrule is inserted up to this stop, whereupon the control disk 4 is rotated.
  • the jaws 11 grip the ferrule, center it and hold it.
  • a light barrier 15 is embedded in the base plate 5. It serves to check the presence of an optical fiber end with or without a ferrule. As long as there is no ferrule in the ferrule holder, it is prevented that the elements of the measuring head can be actuated. This serves in particular to protect the sensor. As soon as the ferrule is held centered, the sliding elements 12 are moved radially outward and release the free end of the ferrule with the end of the optical waveguide. The sliding elements 12 serve as a stop when inserting a ferrule and as a spacer for the sensor 3 as long as the clamping jaws 11 are open. This guarantees that the sensor 3 cannot be damaged when inserting a ferrule. In this position, the sliding elements 12 hold the sensor against spring pressure in a rearwardly pushed position.
  • the sensor 3 is held displaceably in the sensor holder 2. He is always concentric to a central (imaginary) axis of a ferrule resp. held an optical fiber. It is held at a safe distance by the sliding elements 12 when the ferrule holder is open. When the clamping jaws 11 are closed and the sliding elements 12 move away, the sensor 3 is pushed against the ferrule and the end of the optical fiber by the spring pressure.
  • the sensor 3 is provided with a sensor stop 31 on its head.
  • the sensor stop 31 surrounds the head, respectively. the surface of the sensor 3 as a small cylindrical ring.
  • the sensor 3 comes to a stop with this sensor stop 31 at the free end of the ferrule. It is thus positioned precisely defined in relation to the ferrule end and the optical fiber end. This means that the distance and the entire geometric position of the sensor 3 with respect to the optical waveguide to be measured is always exactly the same and reproducible. Many measurement errors can thus be avoided or at least compensated for by calculation.
  • the damping measurement and evaluation as such takes place in a known manner.
  • the actual sensor 3 is no longer accommodated in the measuring head itself.
  • the optical waveguide has a coupling element 3 "at the other end, by means of which it is coupled to the sensor 3.
  • the advantage of this embodiment is that that the sensor itself can be located directly on the measuring instrument. After the attenuation measurement has been completed, the optical fiber is removed from the measuring head. To do this, the control disk is turned backwards again. The sliding elements 12 are moved together radially inwards. As a result, the sensor is automatically pushed backwards against the spring pressure, whereupon the clamping jaws 11 are moved radially outwards. The ferrule holder 14 is now open and the optical waveguide with the ferrule can be removed. The measuring head is ready to accept another optical fiber.
  • the new type of measuring head can now be supplemented with an automatic placement machine which automatically detects optical fibers fitted with ferrules, inserts them into the ferrule receptacle 14, carries out the described process including the measurement and logs and then removes the optical waveguide from the ferrule receptacle.
  • the measuring head according to the invention for the attenuation test of optical fibers with connecting elements basically has a sensor connected to an electronic circuit in a sensor holder and at least two clamping jaws that can be moved or swiveled from an assembly position to a measuring position and back.
  • the clamping jaws can be prism-shaped, for example, and can engage in a claw-like manner.
  • At least one sliding element controls the distance of the sensor from the fiber optic end and the sensor holder or the receptacle for the connecting element, e.g. the ferrule receptacles are slidably mounted in the measuring head from the assembly position to the measuring position and back.
  • At least one stop is available for controlling the relative distance of the sensor from the ferrule receptacle or from the end of the optical waveguide.
  • an expedient embodiment in which the connecting element is a ferrule, consists in that the ferrule receptacle is provided with at least three clamping jaws which can be moved radially from an assembly position into a measuring position and back, as well as at least one sliding element in order to control the distance of the sensor from the end of the optical waveguide.
  • the radially displaceable clamping jaws are advantageously operatively connected to a rotatable control disk provided with cam tracks. Thus, by turning the control disc, all clamping jaws can be moved back and forth simultaneously.
  • At least one sliding element is expediently operatively connected to a rotatable control disk provided with at least one cam track.
  • the sliding element can thus be moved into its end positions by turning the control disk.
  • the sensor holder is advantageously spring-loaded against the ferrule holder, or vice versa.
  • the spring force which can also be adjustable, creates a constant contact pressure that is independent of the operator, which enables comparable measured values.
  • the sliding elements expediently hold the sensor holder in a rest position against spring loading as long as the ferrule holder is open. This creates reproducible conditions when the optical fibers to be measured are introduced into the measuring head.
  • the sliding elements are advantageously retracted to such an extent that the spring load causes the sensor to stop at the end of the optical fiber.
  • a stop is expediently present, which determines the exact measuring position of the sensor relative to the end of the optical waveguide.
  • the stop can be arranged, for example, on the sensor itself or on the ferrule holder.
  • the sensor can advantageously comprise a light transmitter and / or a light receiver.
  • the light transmitter and light receiver can also be combined in a compact unit.
  • the measuring head is expediently provided with an automatic placement machine or integrated into a placement unit. The measuring head can thus be used in automated manufacturing processes.
  • An optical waveguide is advantageously arranged between the sensor and the measuring position.
  • the sensor can be arranged in a position which is favorable for monitoring and service, for example directly on the measuring instrument.
  • the senor itself is a light source which, in the measurement state, cooperates with a sensor for the other end of the optical waveguide.
  • the sliding element and the jaws are advantageously formed in one piece. This reduces the number of moving individual parts and also simplifies the assembly of these parts
  • the cam track or the cam tracks are preferably formed in a single control disk. This means that all the individual parts that are in engagement with the control disc are moved simultaneously and synchronously.
  • the sensor and / or the light source is expediently pressed against the cable end or the ferrule or ferrule receptacle or the stop with a defined, preferably adjustable force.
  • the defined force creates clear and reproducible conditions for all measuring processes.
  • the light barrier advantageously recognizes whether there is an optical waveguide in the fixing unit.
  • the detection process can be initiated automatically by inserting an optical fiber into the measuring head.
  • the measuring tip can expediently be moved against the optical waveguide by means of a magnet and can be withdrawn by spring force.
  • the magnet can be designed, for example, as an electromagnet. Electromagnets result in a compact design and have a relatively high actuating force that remains the same over a larger travel range as well as good controllability.
  • An advantageous method for positioning a sensor or a light source relative to an optical waveguide in a measuring head is that the optical waveguide to be measured is inserted into the measuring head and pressed against a stop, the light barrier recognizing whether an optical waveguide has been inserted into the fixing unit , the optical waveguide is fixed centrally, the measuring tip and the optical waveguide are shifted relative to one another in the same axis by means of magnets; or be withdrawn by means of spring force.
  • the stop is adjustable.
  • the adjustability can be done continuously, for example by means of adjusting screws, or in steps by means of interchangeable stops
  • the measuring head according to the invention can be operated independently as a single device. However, it is particularly expedient if it is integrated in an automatic assembly machine or in a measuring machine, which also measures other parameters, such as the position of the optical waveguide relative to the ferrule, or relative to the connecting element.
  • the optical waveguide is also provided without a connecting element or without a ferrule, and the ferrule receptacle is thus a mere optical waveguide receptacle.
  • the slide or stop is optionally formed for simplification by the sensor or by the light source itself. This enables direct contact of the optical waveguide to be measured with the sensor or the light source itself, thereby avoiding transmission losses.
  • the radial position of the sensor or the light source with respect to the optical waveguide, or vice versa, is advantageously adjustable.
  • central or eccentric areas of the optical waveguide can be examined and measured.
  • the clamping force of the clamping jaws can be measured and adjusted. This can thus be optimally adapted to the dimensions and the nature of the optical waveguides to be measured.
  • the clamping elements or clamping jaws are advantageously designed as clamping balls.
  • Spherical clamping elements do not result in any sharp-edged indentations and therefore no injuries to the optical fibers to be measured or the ferrules.
  • the control disk is expediently driven via a motor, preferably via an electric motor designed as a DC motor, a stepper motor or a pneumatically or hydraulically controlled actuator.
  • FIG. 5 shows a further embodiment, of a clamping mechanism according to the invention, with two clamping jaws
  • FIG. 6 shows a variant of a clamping mechanism according to the invention, with spherical clamping bodies
  • FIG. 7 shows a measuring head according to the invention, shown partly in section
  • Fig. 8 is a view of the measuring head shown in Fig. 7, in the direction of arrow Z.
  • the clamping device shown in FIG. 5 essentially consists of two diametrically opposed, mutually displaceable clamping jaws 11 '. These are shown on their the ends, between which an optical fiber 32 to be tensioned is arranged, are essentially prismatic. In the case of smaller diameters of the optical waveguides 32 to be tensioned, the clamping jaws 11 'can also engage in a claw-like manner.
  • clamping balls 16 are arranged evenly distributed on the circumference.
  • the clamping balls 6 are pressed radially against the light guide 32 by means of springs 17.
  • the springs 17 are supported on the outside on cam tracks 41 "of a rotatable control disk 4 '. By turning the control disk 4', the contact pressure of the clamping balls 16 can be regulated. However, the clamping balls 16 can also be directly on the cam tracks 41" of the control disk without springs 17 Support 4 '.
  • the measuring head shown in FIGS. 7 and 8 consists of a housing 19 and an insertion funnel 20 arranged thereon for the optical waveguide to be measured. At the inner end of the insertion funnel 20 there is an axially displaceable measuring tip 21 which can be moved by means of a magnet 22 against the force of a spring element 23.
  • An electric motor 24, which is preferably designed as a DC motor, is used for the non-slip drive of a control disk 4 ′′ via a toothed belt 25.
  • the control disk 4 ′′ operates clamping and sliding elements (not shown) corresponding to those in FIGS. 1 to 3, 5 and 6.
  • the rotatability the control disk 4 "is limited by means of limit switches 26, 26 'and is preferably adjustable.
  • Base plate 1 11 'clamping jaws 2 sliding element 3 cam 4 ferrule holder 5 light barrier 6 clamping ball 7 spring

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Mechanical Coupling Of Light Guides (AREA)

Abstract

L'invention concerne une tête de mesure destinée à des tests d'atténuation sur des fibres optiques et constituée de deux éléments de base reliés entre eux : un support (1) pour une ferrule équipée d'une fibre optique et un support de capteur (2). Selon l'invention, une extrémité de fibre optique fixée dans une ferrule est insérée pour le test d'atténuation dans le support de ferrule (1) et y est fixée. Ensuite, un capteur approprié (3) est amené d'une position de repos dans une position de mesure dans le support de capteur (2). La position de mesure est toujours fixée géométriquement précisément en face de l'extrémité de fibre optique. Les tests d'atténuation sur la fibre optique sont alors exécutés sur une fibre optique confectionnée à l'aide de ferrules. Ainsi, les résultats de mesure ne sont pas influencés par des conditions secondaires à cause d'une géométrie imprécise.
PCT/IB2002/002898 2001-07-24 2002-07-24 Tete de mesure pour des tests d'attenuation sur des fibres optiques WO2003010503A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE10296967T DE10296967D2 (de) 2002-07-24 2002-07-24 Messkopf für Dämpfungsprüfungen an Lichtwellenleitern

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH13762001 2001-07-24
CH1376/01 2001-07-24

Publications (1)

Publication Number Publication Date
WO2003010503A1 true WO2003010503A1 (fr) 2003-02-06

Family

ID=4565430

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2002/002898 WO2003010503A1 (fr) 2001-07-24 2002-07-24 Tete de mesure pour des tests d'attenuation sur des fibres optiques

Country Status (1)

Country Link
WO (1) WO2003010503A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19856286B4 (de) * 1998-12-07 2011-03-24 Skf Gmbh Verfahren und Vorrichtung zum Vermessen eines Werkstücks mit mindestens einer zu vermessenden zylindrischen Fläche

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5127725A (en) * 1990-09-24 1992-07-07 Photon Kinetics, Inc. Method and apparatus for testing multiple optical fibers

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5127725A (en) * 1990-09-24 1992-07-07 Photon Kinetics, Inc. Method and apparatus for testing multiple optical fibers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19856286B4 (de) * 1998-12-07 2011-03-24 Skf Gmbh Verfahren und Vorrichtung zum Vermessen eines Werkstücks mit mindestens einer zu vermessenden zylindrischen Fläche

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