WO2016201969A1 - 一种水工测渗用自控热源特制单模光纤 - Google Patents

一种水工测渗用自控热源特制单模光纤 Download PDF

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Publication number
WO2016201969A1
WO2016201969A1 PCT/CN2016/070585 CN2016070585W WO2016201969A1 WO 2016201969 A1 WO2016201969 A1 WO 2016201969A1 CN 2016070585 W CN2016070585 W CN 2016070585W WO 2016201969 A1 WO2016201969 A1 WO 2016201969A1
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Prior art keywords
optical fiber
ring
seepage
filter
mode optical
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PCT/CN2016/070585
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English (en)
French (fr)
Inventor
苏怀智
杨孟
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河海大学
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Application filed by 河海大学 filed Critical 河海大学
Priority to US15/736,080 priority Critical patent/US10095000B2/en
Priority to GB1720708.5A priority patent/GB2556478B/en
Priority to SG11201710522RA priority patent/SG11201710522RA/en
Publication of WO2016201969A1 publication Critical patent/WO2016201969A1/zh

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    • 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
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • 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
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/44384—Means specially adapted for strengthening or protecting the cables the means comprising water blocking or hydrophobic materials
    • 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
    • G01D5/268—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 using optical fibres
    • 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
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/4436—Heat resistant
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
    • G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
    • G01N21/7703—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator using reagent-clad optical fibres or optical waveguides
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/85—Investigating moving fluids or granular solids
    • 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
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4402—Optical cables with one single optical waveguide
    • 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
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/443—Protective covering

Definitions

  • the invention relates to a single mode optical fiber, in particular to a special single mode optical fiber for self-controlled heat source for hydraulic infiltration.
  • optical fiber sensing technology is highly resistant to electromagnetic interference, low cost, and the technical advantages of distributed monitoring. It has promoted its wider application in the fields of engineering safety and health monitoring such as water conservancy and civil engineering, but due to the technology itself. Perfecting and the particularity of the working environment, fiber optic sensing technology is applied to the seepage monitoring of hydraulic structures (especially leakage and saturation line monitoring), and a large number of technical problems have not been effectively solved.
  • the present invention is based on the above background and objectives, and is developed in conjunction with problems encountered in actual engineering.
  • the single core arrangement of the invention can detect the seepage of the structure more effectively and directly, and further expand the application range thereof; the inner protective elastic layer, the heat insulating steel ring, the inner layer filling ring, the elastic hard ring, the anti-seepage heat insulation
  • the five-layer layout of the collar increases the level of anti-seepage and elastic buffering, and the engineering applicability is stronger; the inward recessed design of the four sides greatly increases the direction and range of monitoring; the drainage water storage sleeve and the first filter
  • the simple design of the mesh and the second filter enhances its overall fit.
  • the present invention provides a special single-mode optical fiber for a self-controlled heat source for hydraulic infiltration.
  • the anti-seepage insulating hard collar can filter four sides inwardly. The structure outside the net is isolated and impeded, and the seepage water is filtered under the combined action of the first screen mesh and the second screen gauze, and the first screen mesh and the second screen mesh are laid on the net. There are unequal diameter through holes to control the flow of seepage water. The seepage water controlled by the seepage flow rate is in contact with the single core fiber after passing through the water storage cotton jacket.
  • the contact between the seepage water and the single core fiber at different flow rates realizes a single
  • a self-controlled heat source for inspecting a special single-mode optical fiber is provided with a single-core optical fiber, an inner protective elastic layer, an insulated steel ring, an inner layer filling ring, and elasticity from the inside to the outside.
  • Hard ring, anti-seepage and heat-insulated hard ring, single-core fiber is connected with several outer sleeves, and the outer sleeve is passed through inner protective elastic layer, insulated steel ring, inner layer filling ring and elastic hard.
  • the ring is connected with the anti-seepage insulating hard collar, the outer sleeve protective tube is filled with a drainage water storage cotton sleeve, the drainage water storage cotton sleeve is connected with the second filter net, and the second filter net is provided with the second filter mesh through hole, second
  • the filter screen is connected to the first filter net, and the first filter net is provided with a first filter mesh through hole.
  • the elastic hard ring and the anti-seepage insulating hard collar are irregular quadrangular frames, the four sides of the quadrilateral frame are inwardly recessed, and the four corners of the quadrangular frame are rounded to better compare with the to-be-tested The structure is occluded to achieve synergistic deformation.
  • the diameter of the first screen mesh through-hole of the first filter screen is larger than the aperture of the second screen mesh through-hole of the second screen, and the difference of the aperture is more than 2 times.
  • the outer sheath has four tubes, which are respectively located in the 0°, 90°, 180°, and 270° radial directions of the single-core fiber.
  • the first screen and the second screen are both located within the barrier insulating hard collar.
  • the single-core optical fiber in the invention can detect the seepage water of the structure more effectively and directly, and can better expand the application range thereof, and is also convenient for production and manufacture, and uses the inner protective elastic layer, the heat insulating steel ring and the inner layer filling ring.
  • the five-layer layout of the elastic hard ring and the anti-seepage and heat-insulating hard collar increases the level of anti-seepage and elastic buffer, and the engineering applicability is strong.
  • the invention carries out the design of the inward depression of the four sides, greatly increases the direction and range of the monitoring, and can realize multi-directional monitoring of 0°, 90°, 180° and 270°.
  • the corresponding direction of the drainage water storage cotton sleeve, the first filter net and the second filter net are designed, which is easy to manufacture and, because it is only connected with the single-mode fiber, the overall density is enhanced. Synergy.
  • the anti-seepage and heat-insulating hard collar can isolate and hinder the structure other than the filter screen with four sides inwardly recessed, and under the joint action of the first screen mesh and the second screen mesh Seepage water is filtered, and the first screen yarn
  • the mesh and the second filter mesh are arranged with unequal diameter through holes to control the flow of the seepage water.
  • the seepage water controlled by the seepage flow rate is in contact with the single core fiber after passing through the water storage cotton jacket, and the seepage water at different flow rates
  • the contact with the single-core fiber realizes the automatic change of the temperature of the single-core fiber.
  • the present invention can achieve automatic temperature change based on actual external seepage conditions.
  • the special single-mode optical fiber for self-controlling heat source for hydraulic infiltration of the present invention is provided with an inner protective elastic layer, an insulating steel ring, an inner layer filling ring, an elastic hard ring, and an anti-seepage heat insulation outside the single-core optical fiber.
  • the collar can realize the automatic temperature change of the single-core fiber, and can form a large temperature difference between the single-core fiber and the environment. When used for seepage monitoring, the visibility and practicability of the seepage can be significantly improved.
  • Figure 1 is a schematic view of the structure of the present invention
  • FIG. 2 is a schematic structural view of the outer sleeve sheath of FIG. 1.
  • a special single-mode optical fiber for self-controlling heat source for hydraulic infiltration is provided with a single-core optical fiber 211, an inner protective elastic layer 210, an insulating steel ring 209, and an inner portion from the inside to the outside.
  • the layer sealing ring 212, the elastic hard ring 213, the anti-seepage insulating hard ring 214, and the single-core optical fiber 211 are respectively connected to the four outer sleeve protective tubes 201, which are respectively located at 0°, 90°, 180 of the single-core optical fiber 211.
  • the outer sleeve protective tube 201 is sequentially connected through the inner protective elastic layer 210, the heat insulating steel ring 209, the inner layer filling ring 212, the elastic hard ring 213 and the anti-seepage insulating hard ring 214,
  • the sleeve protective tube 201 is filled with a drainage water storage cotton sleeve 208, and the drainage water storage cotton sleeve 208 mainly guides the water seepage filtered by the first filter screen 205 and the second filter screen 206 onto the single-core optical fiber, and the water seepage is temporarily stored.
  • the first filter screen 205 and the second filter screen 206 mainly filter the seepage water to filter the impurities doped therein, and the through hole design of the pore diameter change can realize the control of the seepage flow rate, and drain the water storage cotton sleeve 208 and
  • the second filter mesh 206 is connected, and the second filter mesh 206 is provided with a second filter mesh through hole 207, and the second filter mesh 206 is externally connected.
  • the first screen 205 is connected, and the first screen 205 is provided with a first screen mesh through hole 204.
  • the inner protective elastic layer 210 is composed of a TPE thermoplastic elastomer; the heat insulating steel ring 209 is composed of Q345 type low alloy steel composition; inner layer packing ring 212 is composed of linear low density polyethylene material; elastic hard ring 213 is composed of polyester elastomer material, and impervious heat insulating hard ring 214 is made of polyacrylic acid A structure composed of raw materials such as magnesium oxide, sodium silicate, stearic acid, and dibasic hydrogen phosphate.
  • the inner protective elastic layer 210 is mainly in direct contact with the single-core optical fiber to buffer and protect the optical fiber; the heat insulating steel ring 209 blocks the heat of the outer portion of the inner protective elastic layer 210 and protects the inner protective elastic layer 210.
  • the inner layering ring 212 is mainly filled with a gap between the insulating steel ring 209 and the elastic hard ring 213 to make the structure more encrypted; the elastic hard ring 213 is used for connection and second protection, and the inner layer is filled.
  • the ring 212 is connected to the anti-seepage insulating hard collar 214 and protects the internal components from damage.
  • the anti-seepage insulating hard collar 214 mainly prevents the infiltration of external water and blocks the transfer of external heat.
  • the elastic hard ring 213 and the anti-seepage insulating hard collar 214 are irregular quadrangular frames, the four sides of the quadrilateral frame are inwardly recessed, and the four corners of the quadrangular frame are rounded, respectively.
  • the aperture of the first screen mesh through hole 204 disposed on the first screen 205 is larger than the aperture of the second screen mesh through hole 207 disposed on the second screen 206, and the difference in aperture is more than 2 times.
  • the first screen 205 and the second screen 206 are both located within the barrier insulating hard collar 214.

Abstract

一种水工测渗用自控热源特制单模光纤，从内到外依次设有单芯光纤（211）、内护弹性层（210）、绝热钢环（209）、内层填护环（212）、弹性硬环（213）、防渗隔热硬套环（214），单芯光纤（211）分别与若干根外圆套护管（201）连接，外圆套护管（201）依次穿过内护弹性层（210）、绝热钢环（209）、内层填护环（212）、弹性硬环（213）与防渗隔热硬套环（214）连接，外圆套护管（201）内装填有引流储水棉套（208），引流储水棉套（208）与第二滤网（206）相连，第二滤网（206）外与第一滤网（205）相连，所述水工测渗用自控热源特制单模光纤，通过在单芯光纤（211）外设内护弹性层（210）、绝热钢环（209）、内层填护环（212）、弹性硬环（213）、防渗隔热硬套环（214），实现单芯光纤（211）的自动变温，且在单芯光纤（211）与环境间形成较大的温差，应用于渗流监测时，可显著提升渗流的辨识度和实用性。

Description

一种水工测渗用自控热源特制单模光纤 技术领域
本发明涉及一种单模光纤，具体涉及一种水工测渗用自控热源特制单模光纤。
背景技术
光纤的诞生不但为通讯领域带来了革新，也促进了传感监测领域的重大变革和发展。光纤传感技术强抗电磁干扰能力、低廉的成本、可实现分布式监测的技术优势，推动了其在水利、土木等工程安全和健康监控领域中越来越广泛的应用，但由于技术本身的不完善和工作环境的特殊性，光纤传感技术应用于水工结构渗流监测(特别是渗漏量和浸润线监测)，尚有大量技术性难题未得到有效解决。传统借助光纤布设方案的优化设计，虽为提高光纤测渗精度和效率等起到了一定的积极作用，但尚不能从根本上解决传统光纤测渗的技术缺陷和不足，且往往会显著增加施工难度及布设成本，极大限制了该项技术在实际工程中的应用和推广。
应用传感光纤进行渗流监测时，目前多需要借助外接电路对光纤实施加热，为此不但要求所用光纤具有加热功能，而且要构建一套完整的加热电路，因而大大增加了光纤的生产成本，且由于室内外监测中比较难于协调外接电路的电压与加热光纤之间的关系，常导致加热光纤出现电压不稳或者过大，甚至因此引起光纤在短时间内即出现护套松软甚至烧焦的现象，对操作人员及仪器等产生严重危害；另外，应用于实际工程的现场监测，常缺少必要的安全措施，加热电路铺设较为困难，特别是对于水利与水电工程，由于大多坐落于偏远地区，建设和运行环境异常恶劣，光纤铺设和加热功能的实现更加不易甚至无法完成。因此，迫切需要充分考虑水工渗流监测特点和特殊工作环境，着力于传感光纤本身的生产装配，研制具有自控热源的渗流监测专用光纤，以从源头上提升光纤测渗技术性能指标和实用能力。
本发明正是基于上述背景和目标，结合实际工程所遇问题而研制。本发明的单芯设置，可以更有效更直接地探测结构物渗流，更好地扩大其应用范围；内护弹性层、绝热钢环、内层填护环、弹性硬环、防渗隔热硬套环的五层布设，增加了防渗、弹性缓冲等的层级，工程适用性更强；四个边的向内凹陷设计大大增加了其监测的方向及范围；引流储水棉套、第一滤网和第二滤网的简单设计，增强了其整体的密合性。
发明内容
发明目的：为了克服现有技术中存在的不足，本发明提供一种水工测渗用自控热源特制单模光纤，该发明中防渗隔热硬套环可以将四个边向内凹陷处滤网以外的结构体进行隔离及阻渗，在第一滤网纱网和第二滤网纱网的联合作用下对渗流水进行过滤，且第一滤网纱网和第二滤网纱网上布设有不等直径的通孔可实现对渗流水的控流，被控制渗流流速的渗流水在通过引流储水棉套后与单芯光纤接触，不同流速下渗流水与单芯光纤的接触实现了单芯光纤温度的自动变化，在外界渗流较大时，其渗流流速较大，则与单芯光纤接触速度增快，在短时间内的降温更快，反之，更慢。
技术方案：为达到上述目的，本发明的一种自控热源测渗用特制单模光纤，从内到外依次设有单芯光纤、内护弹性层、绝热钢环、内层填护环、弹性硬环、防渗隔热硬套环，单芯光纤分别与若干根外圆套护管连接，外圆套护管依次穿过内护弹性层、绝热钢环、内层填护环、弹性硬环与防渗隔热硬套环连接，外圆套护管内装填有引流储水棉套，引流储水棉套与第二滤网相连，第二滤网上布设有第二滤网纱网通孔，第二滤网外与第一滤网相连，第一滤网上布设有第一滤网纱网通孔。
作为优选，所述弹性硬环和防渗隔热硬套环为不规则的四边形框，四边形框的四个边向内凹陷，四边形框的四个角为圆角，可以更好地与待测结构体咬合，实现协同变形。
作为优选，所述第一滤网上布设的第一滤网纱网通孔孔径要大于第二滤网上布设的第二滤网纱网通孔孔径，且其孔径的差值要在2倍以上。
作为优选，所述外圆套护管有四根，分别位于单芯光纤的0°、90°、180°、270°径向上。
作为优选，所述第一滤网和第二滤网均位于防渗隔热硬套环内。
本发明中的单芯光纤可以更有效更直接地探测结构物渗流水，且可更好地扩大其应用范围，也方便生产制造，使用了内护弹性层、绝热钢环、内层填护环、弹性硬环、防渗隔热硬套环的五层布设，增加了防渗、弹性缓冲等的层级，工程适用性强。
本发明进行了四个边的向内凹陷设计，大大增加了其监测的方向及范围，可以实现0°、90°、180°、270°多方位的监测。为了更好地配套于多方位监测，设计了对应方向的引流储水棉套、第一滤网和第二滤网，容易生产制造，且由于只与单模光纤连接，更增强了其整体的密合性。
本发明中防渗隔热硬套环可以将四个边向内凹陷处滤网以外的结构体进行隔离及阻渗，在第一滤网纱网和第二滤网纱网的联合作用下对渗流水进行过滤，且第一滤网纱 网和第二滤网纱网上布设有不等直径的通孔可实现对渗流水的控流，被控制渗流流速的渗流水在通过引流储水棉套后与单芯光纤接触，不同流速下渗流水与单芯光纤的接触实现了单芯光纤温度的自动变化，在外界渗流较大时，其渗流流速较大，则与单芯光纤接触速度增快，在短时间内的降温更快，反之，更慢，本发明可以实现基于外界实际渗流情况的自动变温。
有益效果：本发明的水工测渗用自控热源特制单模光纤，通过在单芯光纤外设有内护弹性层、绝热钢环、内层填护环、弹性硬环、防渗隔热硬套环，可以实现单芯光纤的自动变温，并且可在单芯光纤与环境间形成较大的温差，应用于渗流监测时，可显著提升渗流的辨识度和实用性。
附图说明
图1为本发明的结构示意图；
图2为图1中外圆套护管的结构示意图。
图中，200-第三过渡突端、201-外圆套护管、202-第二过渡突端、203-第一过渡突端、204-第一滤网纱网通孔、205-第一滤网、206-第二滤网、207-第二滤网纱网通孔、208-引流储水棉套、209-绝热钢环、210-内护弹性层、211-单芯光纤、212-内层填护环、213-弹性硬环、214-防渗隔热硬套环。
具体实施方式
下面结合附图对本发明作更进一步的说明。
如图1和图2所示，本发明的一种水工测渗用自控热源特制单模光纤，从内到外依次设有单芯光纤211、内护弹性层210、绝热钢环209、内层填护环212、弹性硬环213、防渗隔热硬套环214，单芯光纤211分别与四根外圆套护管201连接，分别位于单芯光纤211的0°、90°、180°、270°径向上，外圆套护管201依次穿过内护弹性层210、绝热钢环209、内层填护环212、弹性硬环213与防渗隔热硬套环214连接，外圆套护管201内装填有引流储水棉套208，引流储水棉套208主要是将由第一滤网205、第二滤网206过滤过的渗水引导到单芯光纤上，且将渗水短暂的储存在棉套中；第一滤网205、第二滤网206主要是对渗流水进行过滤将其中掺杂的杂质滤除，孔径变化的通孔设计可以实现渗流流速的控制，引流储水棉套208与第二滤网206相连，第二滤网206上布设有第二滤网纱网通孔207，第二滤网206外与第一滤网205相连，第一滤网205上布设有第一滤网纱网通孔204。内护弹性层210是由TPE热塑性弹性体构成；绝热钢环209是由 Q345型的低合金钢组成；内层填护环212是由线性低密度聚乙烯材料构成；弹性硬环213是由聚酯弹性体材料组成，防渗隔热硬套环214是由聚丙烯酸份、氧化镁、硅酸钠、硬脂酸、磷酸氢二铝等原料组成的结构体。
内护弹性层210主要是与单芯光纤直接接触，起到缓冲及保护光纤的作用；绝热钢环209是将内护弹性层210以外部分的热量阻挡在外面及保护内护弹性层210。内层填护环212主要是填充绝热钢环209与弹性硬环213之间的空白，让结构体更加密合；弹性硬环213是起到连接及第二次保护作用，将内层填护环212与防渗隔热硬套环214连接，且保护内部的各组件免受损坏；防渗隔热硬套环214主要是起到防止外界水体的渗入及阻断外界热量的传递。
在本发明中，所述弹性硬环213和防渗隔热硬套环214为不规则的四边形框，四边形框的四个边向内凹陷，四边形框的四个角为圆角，分别为防渗隔热硬套环214、弹性硬环213和内层填护环212形成的第三过渡突端200、第二过渡突端202、第一过渡突端203。第一滤网205上布设的第一滤网纱网通孔204的孔径要大于第二滤网206上布设的第二滤网纱网通孔207的孔径，且其孔径的差值要在2倍以上，第一滤网205和第二滤网206均位于防渗隔热硬套环214内。
以上所述仅是本发明的优选实施方式，应当指出：对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (5)

  1. 一种水工测渗用自控热源特制单模光纤，其特征在于：从内到外依次设有单芯光纤、内护弹性层、绝热钢环、内层填护环、弹性硬环、防渗隔热硬套环，所述单芯光纤分别与若干根外圆套护管连接，外圆套护管依次穿过内护弹性层、绝热钢环、内层填护环、弹性硬环与防渗隔热硬套环连接，外圆套护管内装填有引流储水棉套，引流储水棉套与第二滤网相连，第二滤网上布设有第二滤网纱网通孔，第二滤网外与第一滤网相连，第一滤网上布设有第一滤网纱网通孔。
  2. 根据权利要求1所述的水工测渗用自控热源特制单模光纤，其特征在于：所述弹性硬环和防渗隔热硬套环为不规则的四边形框，四边形框的四个边向内凹陷，四边形框的四个角为圆角。
  3. 根据权利要求2所述的水工测渗用自控热源特制单模光纤，其特征在于：所述第一滤网上布设的第一滤网纱网通孔孔径要大于第二滤网上布设的第二滤网纱网通孔孔径，且其孔径的差值要在2倍以上。
  4. 根据权利要求3所述的水工测渗用自控热源特制单模光纤，其特征在于：所述外圆套护管有四根，分别位于单芯光纤的0°、90°、180°、270°径向上。
  5. 根据权利要求4所述的水工测渗用自控热源特制单模光纤，其特征在于：所述第一滤网和第二滤网均位于防渗隔热硬套环内。
PCT/CN2016/070585 2015-06-19 2016-01-11 一种水工测渗用自控热源特制单模光纤 WO2016201969A1 (zh)

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