WO2011154676A1 - Ensemble capteur et procédé de détection - Google Patents

Ensemble capteur et procédé de détection Download PDF

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Publication number
WO2011154676A1
WO2011154676A1 PCT/GB2010/050952 GB2010050952W WO2011154676A1 WO 2011154676 A1 WO2011154676 A1 WO 2011154676A1 GB 2010050952 W GB2010050952 W GB 2010050952W WO 2011154676 A1 WO2011154676 A1 WO 2011154676A1
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WO
WIPO (PCT)
Prior art keywords
sensor assembly
sensor
engaging
sensing
assembly according
Prior art date
Application number
PCT/GB2010/050952
Other languages
English (en)
Inventor
Andrew James Daton-Lovett
Original Assignee
Rwr Systems Limited
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 Rwr Systems Limited filed Critical Rwr Systems Limited
Priority to PCT/GB2010/050952 priority Critical patent/WO2011154676A1/fr
Publication of WO2011154676A1 publication Critical patent/WO2011154676A1/fr

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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
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • G01D11/24—Housings ; Casings for instruments
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/001—Survey of boreholes or wells for underwater installation

Definitions

  • the present invention relates to a sensor assembly and to a method of sensing.
  • a structure such as a beam or a pipe or a girder, etc.
  • sensors can be applied to the structure in a variety of ways .
  • PIG Pipeline Inspection Gauge
  • the sensors are only temporarily in any particular position in the pipe so that only a "snapshot" of the condition of the pipe can be obtained.
  • the type of sensing that can be performed by a PIG is constrained due to the fact that the PIG must move in the pipe. This can introduce acoustic noise and makes using certain types of sensor difficult or impossible where the sensors need to have a reliable contact with the structure, e.g. a strain gauge.
  • Discrete sensors can be attached to the structure, for example by bolting or gluing the sensor to the structure. These tend to have the disadvantage that they only measure localised properties of the structure, such as the
  • strain gauge An example of a sensor that can be attached to a structure is a strain gauge, the use of which is well known per se to measure deformation in underlying structures .
  • the strain gauge consists of an insulating flexible backing which supports a metallic foil pattern.
  • the gauge is attached to the structure by a suitable adhesive, such as cyanoacrylate .
  • cyanoacrylate As the structure is deformed, the foil is correspondingly deformed, causing its electrical resistance to change, which can be measured to give an indication of the deformation of the structure.
  • Strain gauges however can be difficult to attach, for example where the structure to be measured is hard to access by an operator. Strain gauges usually need to be permanently attached, making it difficult or impossible to replace, move, or remove a sensor once in place. Strain gauges also usually measure relatively localised properties of the structure and in most cases are limited to measuring strain (i.e. deformation) of the structure.
  • sensors may be incorporated into the structure at the time of manufacture. This has the
  • Another disadvantage of this scheme is that sensors incorporated into the structure at the time of manufacture usually cannot be removed, meaning that it is generally impossible to repair or replace a malfunctioning sensor, or upgrade a sensor, or even move a sensor to a different part of the structure or to a
  • a sensor assembly for sensing a property associated with a structure of interest, the assembly comprising:
  • an elongate member constructed and arranged so as to be capable of assuming a structure-engaging form in which it is resiliently biased such that the member can engage with and grip a said structure along at least part of the length of the member;
  • At least one sensor supported by the elongate member.
  • the member is in effect capable of "clipping" to the structure, i.e. engaging with and gripping the structure due to its resiliency.
  • the clipping arrangement means that the member is simple to fit to a structure.
  • the sensor assembly can be engaged to the outside of a structure, for example to the outside of a beam, or pipe, or girder, etc.
  • the sensor assembly can be engaged to the "inside" of a structure where the structure is hollow or has a concave cavity, such as a hollow pipe.
  • the gripping arrangement allows the structure to conform closely to the structure, meaning that the sensing assembly experiences similar conditions as the structure. For example, stress, strain and vibration may be
  • the clipping arrangement also means that the sensor assembly can minimise acoustic noise due to friction caused by movement of the sensing apparatus relative to the
  • the member being elongate means that the structure can be sensed along a length of the structure due to the longitudinal extent of the member being substantially greater than the transverse extent of the member when in the structure-engaging form. This means that a single sensor assembly requiring a single fitting operation to the structure can be used to monitor a substantial length of the structure over period of time.
  • longitudinal extent of the member is determined by the desired application of the sensor assembly. Nonetheless, in preferred embodiments the longitudinal extent of the member may at least 5 times, or at least 10 times, or at least 50 times, or at least 100 times the transverse extent of the member when in the structure engaging form.
  • the present invention provides a convenient way of monitoring a length of structure, where the sensor assembly can be retrofitted to the structure, or fitted to the structure at the time of installation of the structure, or even incorporated to the structure at the time of manufacture, as desired.
  • the clipping arrangement also allows removal of the sensor assembly so that the sensor assembly can be repaired, upgraded, or moved in location, or retrieved for data recovery.
  • any suitable type of sensor can be used, such as for example fibre optic sensor systems that are known to be embedded in flexible pipes as described below.
  • Other types of sensors such as strain gauges or any other suitable sensor may be used.
  • the sensor or sensors can extend the full length of the sensor assembly or at least a substantial portion thereof.
  • the sensor or sensors can be run continuously longitudinally along the member or a portion of the member (such as a continuous length of fibre optic sensor) .
  • a plurality of sensors may be positioned at various longitudinal positions on the member. In any event, it is preferred that the sensor or sensors are arranged to be able to sense the structure at a plurality of longitudinal positions.
  • the member is formed from a sheet-like material having first and second longitudinal edges that is folded in on itself longitudinally to form a tube or a longitudinal section of a tube when the member is in the strueture-engaging form.
  • This provides a convenient form for the sensor assembly to be able to engage with and grip the structure.
  • the structure-engaging form of the member subtends an angle of at least 180 degrees. Having an angle of at least 180 degrees allows the member to clip securely to the
  • the structure-engaging form of the member subtends an angle of about 360 degrees. In other words, the member forms an approximate tube. This can help provide an even more secure engagement between the sensor assembly and the structure as the member can grip all around the structure.
  • the structure-engaging form of the member in transverse cross section the structure-engaging form of the member subtends an angle of more than 360 degrees. In other words, there is some overlap between the longitudinal edges of the member in this embodiment. Again, this can help provide a more secure engagement to the structure.
  • the structure-engaging form of the member in transverse cross section is generally curved.
  • This provides a sensing apparatus that is highly versatile in being engageable to a variety of different structures.
  • Preferred embodiments may be circular or oval.
  • other cross sectional forms are possible.
  • the cross section can have straight portions whilst being generally curved.
  • the cross section can even be polygonal .
  • the precise shape of cross section chosen for the member is in practice likely to depend on the
  • the member is constructed and arranged so that it can be progressively flattened and wound about an axis extending transversely to the longitudinal extent of the member to form a coil so as to be reversibly
  • the coiled form allows the sensor assembly to be
  • both longitudinal opposed ends of the member are open ended so that the member can engage with and grip a said structure along the full length of the member .
  • the member is constructed and arranged to allow the sensor assembly to follow bending of the structure of interest whilst maintaining its grip on the structure and staying free from deformations, e.g. without buckling of the edges of the member.
  • the precise amount of bending of the structure that the sensor assembly should be able to follow depends on the application of the sensor assembly and on the structure of interest and in particular on its diameter. Nonetheless, preferred embodiments of the sensor assembly are constructed and arranged such that the peak tensile and compressive strains of the member on the convex and concave sides of the bend respectively may be of a minimum of 4% .
  • the member is formed from a bistable material having a first stable form in which it is coiled and generally flat in cross section, and a second stable form in which it is extended and has the structure-engaging form.
  • a bistable material for the member means that the sensing assembly can be stable both when coiled and when extended and when partially coiled and partially extended. This allows safer and simpler storage of the sensing assembly without impacting its ability to engage with and grip the structure.
  • the member is constructed and arranged to be reversibly clippable to a said structure of interest. This allows the sensor assembly to be removed from the structure for upgrading, or to be moved to a different position on the structure or to a different structure.
  • the at least one sensor includes a fibre optic sensor that extends along at least a portion of the member .
  • the member is formed from a laminate of at least two layers and said sensor is positioned between two of the layers . This protects the sensor from environmental damage .
  • the sensor assembly comprises electronic apparatus in communication with the sensor arranged to provide at least one of: i) a data logging system to allow readings from the sensor to be logged system and ii) a data transmitting system to allow readings from the sensor to be transmitted to remote receiving apparatus.
  • deployment apparatus comprising:
  • a gripper for gripping a said structure of interest; a holder for holding the sensor assembly when coiled; actuating means for in use advancing the deployment apparatus relative to the structure;
  • a guide member for progressively guiding the sensor assembly from being wound to being clipped to the structure as the deployment apparatus advances .
  • the combination may comprise a clamp dispenser
  • a clamp to the member to attach to attach the member to the structure at one or more points along the length of the member to keep the sensor assembly in position longitudinally on the structure.
  • a third aspect of the present invention there is provided a method of sensing a property associated with a structure of interest using a sensor assembly, the method comprising:
  • the elongate member being resiliently biased such that the member engages with and grips the structure along at least part of the length of the member;
  • engaging the member with the structure comprises progressively engaging the member with the structure along the length of the member.
  • the member is formed from a sheetlike material having first and second longitudinal edges and when engaged with the structure the member forms a tube or a longitudinal section of a tube, wherein engaging the member with the structure comprises: separating the
  • engaging the member with the structure comprises: compressing the member; introducing the compressed member into a hollow portion of the structure; and, allowing the resiliency of the member to cause the member to engage with and grip the inside surface of the structure.
  • the method comprises securing the sensor assembly to the structure at one or more points along the length of the member to keep the sensor assembly in position longitudinally on the structure. This helps avoid slippage of the sensor assembly along the structure.
  • the step of sensing with the sensor comprises at least one of: a) sensing temperature; b) sensing pressure; c) sensing vibration; d) sensing stress; and e) sensing strain of the structure.
  • Figures 1 shows an example of a sensor assembly according to an embodiment of the present invention
  • Figure 2 shows a partial cut away of the example of Figure 1;
  • FIGS. 3 to 6 show in cross section further examples of sensor assemblies according to embodiments of the present invention.
  • Figure 7 shows an example of a sensor assembly
  • Figure 8 shows an example of a structure for which the present invention has particular applicability
  • Figure 9 shows an example of deployment apparatus according to an embodiment of the present invention and Figures 9A and 9B show detail views of elements of Figure 9.
  • the apparatus 1 comprises an elongate member 2.
  • the member is formed of a strip of sheet-like material, i.e. the member is thin in cross section.
  • the thinness of the material will in practice depend on the application of the sensor assembly 1. Nonetheless, in preferred
  • the member may be less than 5 mm, or less than 2 mm, or less than 1 mm thin in cross section. It is anticipated that in most cases the thinness of the member compared to the width of the member with deployed may be less than 4%.
  • additional layers may attached to the member 2 for various other purposes, such as floatation layers or layer providing protection from impact damage. These addition layers may give rise to higher overall thickness in the sensor
  • a plurality of sensors 3 are provided running along the length of the elongate member 2.
  • the sensors 3 are fibre optic sensors as described in more detail in the following description.
  • the member 2 as depicted has an extended portion 4 and a coiled portion 5.
  • the member 2 is capable of being progressively transformed between being completely coiled and being completely extended.
  • the length of the member 2 i.e. its longitudinal extent
  • its width i.e. its transverse extent
  • the preferred length will in practice depend on the application chosen for the sensor assembly 1. Nonetheless, in preferred embodiments the length of the member 2 may at least 5 times, or at least 10 times, or at least 50 times, or at least 100 times the width of the member 2.
  • the extended portion 4 is resiliently biased to have a cross section that is curved in the form of a partial circle.
  • the partial circle subtends an angle of about 200 degrees.
  • the member 2 sweeps out a partial circle over an angle 8 of about 200 degrees. It is preferred that the subtended angle is greater than 180 degrees so that the opening to the split tube is narrower than the maximum internal diameter of the tube. This enables the member to "clip" to a structure.
  • Figures 3 to 6 show other examples of cross sections for the member 2.
  • the member 2 has a circular cross section subtending an angle of about 360 degrees, i.e. the member forms a circular tube with a longitudinal split where the edges 6 of the member meet.
  • Figure 4 shows a member 2 where the angle subtended is greater than 360 degrees, i.e. the member approximately forms a circular tube with some degree of overlap of the edges 6.
  • the cross section is however preferably generally curved. However, this does not preclude the cross section having straight portions whilst being generally curved. Ovals and other continuous, non-circular arcs subtending over 180 deg in total can also be produced.
  • Figure 7 shows a sensor assembly 1 according to an embodiment of the present invention when engaged with a structure 10.
  • the structure 10 in this example is a pipe having an approximately circular cross section.
  • the sensor assembly 1 shown in Figure 7 corresponds most closely to the sensor assembly 1 shown in Figure 3, i.e. where the cross section of the member 2 is circular and subtends an angle of about 360 degrees. As will be appreciated, it is preferred that the sensor assembly 1 chosen for a
  • a member cross section that matches the relevant surface of the structure to which it is being engaged to promote a good engagement and grip between the two.
  • a member having a circular cross section is most preferred for a pipe 10 having a circular cross section.
  • the extended member 2 is resiliently biased to
  • the sensor assembly 1 closely follows the structure 10.
  • the sensors 3 of the sensor assembly 1 can sense the properties of the structure 10. For example, temperature, pressure and vibration of the pipe 10 will be coupled to the sensor assembly 1, allowing the sensor 3 to sense these properties associated with the pipe 10 and allowing, with suitable calibration, a measurement to be taken from the sensor data.
  • the member 2 has hoop stiffness large enough to grip the structure 10 and at the same time a longitudinal
  • tensile/compressive modulus low enough to allow the sensor assembly 1 to follow bending of the structure of interest. This allows the sensor assembly 1 to grip and closely follow the structure as the structure bends or otherwise deforms allowing stress and strain to be transmitted to the sensor assembly 1 and so measured.
  • the preferred sensor 3 is a fibre optic cable sensor.
  • Use of fibre optic cable sensors are known per se, for example for monitoring flexible pipes, as discussed in more detail in the following description in relation to Figure 8. Nonetheless, other types of sensor can be used, for example a strain gauge.
  • An electronics system 9 is
  • the electronics system may include a data-logger, power supply and associated instrumentation 9 connected to the sensors 3.
  • the data-logger logs the outputs of the sensors 3.
  • the system 9 can
  • a transmitter for relaying the sensor data to a remote receiver for analysis.
  • the use of a laminar construction with the sensors 3 embedded between layers of the lamina gives an advantageous combination of strain transfer, protection of the fibre from impact, abrasion etc.
  • the layers of the laminar could be polymer, elastomer or even metallic and bonding of the sensor be achieved by adhesively laminating or by
  • processing in in the case of a laminar structure that is a fibre reinforced composite (FRC) .
  • FRC fibre reinforced composite
  • particularly preferred method is to laminate the sensors 3 between layers of fibre reinforced polymer ("FRP"
  • FRPs are known per se and are not described in detail herein. However, in brief, FRPs are composite materials made of a polymer matrix reinforced with fibres. The fibres are usually fiberglass, carbon, or aramid, while the polymer is usually an epoxy, vinylester or polyester thermosetting plastic. The use of fibrous materials mechanically enhances the strength and elasticity of the plastics.
  • the original plastic material without fibre reinforcement is known as the matrix.
  • the matrix is a tough but relatively weak plastic that is reinforced by stronger stiffer reinforcing filaments or fibres. The extent that strength and elasticity are enhanced in a fibre reinforced plastic depends on the mechanical properties of both the fibre and the matrix, their volume relative to one another, and the fibre length and orientation within the matrix.
  • the sensors 3 can be laminated either by incorporating them at the time of consolidation, or by post bonding two or more layers of FRP shell using an adhesive to hold the shells together with the sensors 3 in between the layers of the laminar. The use of FRP allows the mechanical
  • a FRP is a particularly preferred material for making the member 2 as it allows fine tuning of
  • axial/torsional/hoop stiffness to be achieved by, for example, changing the angles and fibre content of the layers. Nonetheless, other materials are possible.
  • a metal ribbon can be used and tuning of its properties can be achieved by punching holes and slots into the metal ribbon.
  • the material used for the member is a bistable material, whether made of FRP or otherwise.
  • a bistable member comprises an extendable, coilable member that can be reconfigured from a coiled or retracted state to an extended state.
  • the sensor assembly 1 shown in Figure 1 can be made optionally from a bistable material such that it has a first stable state in the coiled form, wherein the cross section of the member is generally flat and a second stable state in the extended form, wherein the cross section of the member is curved as previously described.
  • the bistable member 2 is capable of reversible configuration between its coiled and extended forms a plurality of times.
  • Suitable structures are disclosed in the following international patent applications, each of which is incorporated here by reference: WO-A-88/08620 , WO-A-97/35706 , WO-A-99/62811 , and WO-A-99/62812. Such bistable structures are available from RolaTube Technology Limited of Lymington, United Kingdom .
  • such a bistable member generally comprises material that creates a bias towards configuring the material in the extended form (e.g. having a circular cross-section in this example) , as well as material that creates a bias opposite to the first bias (e.g. one that biases the member towards its flattened, retracted or coiled form) .
  • the member can comprise a resilient
  • the member can comprise a strip or sheet of a thermoplastic material having prestressxng means attached thereto or embedded therein.
  • a thermoplastic strip having prestressed fibres therein (such as fibres of glass, carbon, or polymeric materials) .
  • the fibres can be located at different angles relative to each other in the plane of the coiled member, such as comprising one set of fibres that are longitudinally extending and a second set of fibres that are transversely extending.
  • Such fibres-reinforced composite members e.g. a thermoplastic resin, such as polyethylene or polypropylene, with fibres of another material, such as glass, carbon, or aramid, embedded therein
  • a thermoplastic resin such as polyethylene or polypropylene
  • fibres of another material such as glass, carbon, or aramid, embedded therein
  • the member 2 is capable of engaging with and gripping the structure 10. Potentially many types of material, construction and cross section are usable, dependent upon the application, i.e. structure being monitored and what properties are being monitored.
  • the axial modulus of the member 2 (and thus the bending stiffness of the sensor assembly 1 when deployed) should be as low as is consistent with providing a member 2 that has sufficient strength, impact resistance, abrasion resistance, etc. to survive the environment in which it is to be used, and in any event very significantly lower than that of the
  • the hoop modulus with reference to the hoop bending "plane” (i.e. the force exerted to clamp the device onto the underlying structure) should be high enough to ensure that the device cannot move relative to the underlying structure 10 and to prevent buckling out the "seam" line formed by the edges 6 of the member 2 under bending where this is the concave bending face .
  • Flexing of the structure 10 may be minimal, so it is not essential to have low bending stiffness of the extended member 2. in any case, it is always desired to have sufficient hoop closure of the member 2 to couple it closely to the structure 10 and it needs to be resilient enough to be coiled.
  • Figure 8 shows a preferred application of the present invention. It is known to use flexible pipe to transport production fluids, such as oil and/or gas and/or water, from one location to another.
  • Figure 8 shows a riser assembly 200 suitable for transporting production fluid such as oil and/or gas and/or water from a sub-sea location 201 to a floating facility 202.
  • the flexible flow line 205 comprises a flexible pipe, wholly or in part, resting on the sea floor 204 or buried below the sea floor and used in a static application.
  • the floating facility may be
  • the riser 200 is provided as a flexible riser, that is to say a flexible pipe connecting the ship to the sea floor installation. Portions of flexible pipe body can be utilised as a flowline 205 or jumper 206.
  • the pipe body is generally built up as a structure including metallic and polymer layers. The pipe structure allows large
  • flexible pipes 200 with built-in fibre-optical sensors or other sensors such as strain gauges in selected layers of the flexible pipe For example, US-A-2005/0210961
  • US-A-2004/0168521 discloses providing a groove in one of the layers of a flexible pipe into which a fibre optic sensor is secured during manufacture of the flexible pipe, such that the fibre optic sensor is sandwiched within the body of the flexible pipe.
  • various properties associated with the flexible pipes 200 can be monitored, including strain (e.g. for possible metal fatigue) , temperature (e.g. for possible overheating or detection of breaches), pressure (e.g. for detecting excess build up) and the ingress of gas into the internal layers of the flexible pipe (e.g. which can lead to corrosion) .
  • strain e.g. for possible metal fatigue
  • temperature e.g. for possible overheating or detection of breaches
  • pressure e.g. for detecting excess build up
  • the ingress of gas into the internal layers of the flexible pipe e.g. which can lead to corrosion
  • Pipes 200 manufactured without sensors cannot of course be monitored in this way. Also, once fitted, the sensors cannot be removed from the pipes, for example for upgrading or repair, nor moved to a different position on the pipe or to another pipe.
  • the sensor assembly 1 is particularly preferred for use with a flexible sub-sea pipe 200 of this sort. As described above, the sensor assembly 1 can be clipped to a pipe and used to monitor the performance of the pipe 200.
  • FIG. 9 shows an example of an automated apparatus 100, i.e. a remotely operated vehicle (ROV) , for deploying the sensor assembly on a sub-sea flexible pipe 200.
  • ROV remotely operated vehicle
  • the sensor assembly 1 is initially provided to the deployment apparatus 100 in its coiled form.
  • the electronics system 9 is pre-installed on the end of the coiled sensor assembly 1, for example in the space within the centre of the coil. Making the connections between the sensors 3 and the instrumentation before deployment avoids the need for connections to be made sub-sea.
  • the size of this space in the centre of the coil can be varied in order to provide a suitable envelope for this equipment.
  • the deployment apparatus 100 is fitted with a
  • the deployment apparatus 100 has a motor 102 and power source (not shown) , such as a battery, for powering the deployment of the sensor assembly 1.
  • the deployment apparatus 100 has a calliper 103 at one end comprising two actuated, pivoted arms 103a, 103b which are actuated to fit over the flexible pipe 200 and extended sensor assembly 1, as shown in Figure 9A.
  • the calliper 103 retains the deployment apparatus 100 in position with respect to the flexible pipe 200 during the installation procedure and helps ensure that the sensor assembly 1 is accurately positioned relative to the flexible pipe 200 as it is deployed.
  • the calliper 103 also ensures a tight, accurate fit between the sensor assembly 1 and the pipe 200.
  • a secondary guide (not shown) may be provided at the opposite end of the deployment apparatus 100, in order to maintain alignment and avoid stressing the
  • the coiled sensor assembly 1 is fitted behind the guide calliper 103 and has a narrow, protruding tongue 11 at its free end that is left extended through the calliper 103. This allows the end of the sensor assembly 1 to be secured to the pipe 200 prior to deployment.
  • a band clamp 12 is used for securing the tongue 11, as shown in Figure 9B.
  • the deployment apparatus 100 has a band clamp deployment system 104 for applying the band clamp 12 such that the tongue 11 is secured to the flexible pipe 200.
  • the band clamp deployment system 104 can be
  • the sensor assembly 1 can also be clamped to the flexible pipe 200 at more than one location along its length to help keep the sensor assembly 1 in place on the structure. It is preferred to have at least a clamp 12 at the start of the run to keep the first end of the sensor assembly 1 in place, especially during deployment, and a clamp 12 at the opposite end of the sensor assembly 1 to ensure absence of slippage along the length of the deployed sensor assembly 1. Intermediate clamps 12 may, or may not, be desired depending on such factors as the length of run and the diameter of the pipe 200. Data defining the need for and spacing of clamps can be obtained by carrying out
  • the deployment process is as follows: -
  • the deployment apparatus 100 locks the guide calliper 103 over the pipe 200.
  • a band clamp 12 is deployed to lock the tongue 11 and the end of the sensor assembly 1 onto the pipe 200.
  • the motor moves the deployment apparatus 100 moves along the pipe 200, deploying the sensor assembly 1 along its length.
  • the motor 102 may move the deployment apparatus 100 along the flexible pipe 200 and in so doing pull the sensor assembly 1 out of the dispenser 101 as the deployment apparatus 100 advances.
  • the motor 102 may power the dispenser 101 itself, so that the sensor assembly 1 is progressively unwound under the power of the motor 102, and using this to push the deployment apparatus 100.
  • band clamps 12 are applied, as required, along the length of the sensor assembly 1.
  • Suitable mechanisms for dispensing the sensor assembly 1 under power are known per se in the prior art. Such mechanisms are manufactured for example by RolaTube Technology Limited of Lymington, United Kingdom for the powered deployment of bistable coiled members.

Abstract

L'invention concerne un ensemble capteur ainsi qu'un procédé de détection. L'ensemble capteur (1) est destiné à détecter une propriété associée à une structure d'intérêt. L'ensemble capteur (1) comprend un élément oblong (2) construit et disposé de manière à pouvoir adopter une forme de mise en prise avec une structure dans laquelle il est précontraint élastiquement de telle façon que l'élément peut venir en prise avec et saisir ladite structure le long d'une partie au moins de la longueur de l'élément ; et au moins un capteur (3) supporté par l'élément oblong.
PCT/GB2010/050952 2010-06-07 2010-06-07 Ensemble capteur et procédé de détection WO2011154676A1 (fr)

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PCT/GB2010/050952 WO2011154676A1 (fr) 2010-06-07 2010-06-07 Ensemble capteur et procédé de détection

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Cited By (4)

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WO2013098546A1 (fr) * 2011-12-28 2013-07-04 Wellstream International Limited Corps de tuyau souple et procédé
CN103867137A (zh) * 2012-12-18 2014-06-18 韦尔斯特里姆国际有限公司 鞘保护
GB2526247A (en) * 2014-03-12 2015-11-25 Rtl Materials Ltd Methods and apparatus relating to sensor assemblies and fibre optic assemblies
WO2017115082A1 (fr) * 2015-12-31 2017-07-06 Rtl Materials Ltd Tige à courbure secondaire en extension

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