CN106152982A - Distributed coax cable strain sensor of tunable reflectivity and preparation method thereof - Google Patents
Distributed coax cable strain sensor of tunable reflectivity and preparation method thereof Download PDFInfo
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- CN106152982A CN106152982A CN201510239914.8A CN201510239914A CN106152982A CN 106152982 A CN106152982 A CN 106152982A CN 201510239914 A CN201510239914 A CN 201510239914A CN 106152982 A CN106152982 A CN 106152982A
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- metal tube
- coaxial cable
- strain sensor
- housing
- waterproof terminal
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Abstract
The invention discloses the distributed coax cable strain sensor of a kind of tunable reflectivity, including housing, metal tube, metal semicircle tabletting, coaxial cable, waterproof terminal and fixed screw, it is additionally provided with screwed hole on described metal tube, described fixed screw screws in the screwed hole of metal tube, described metal tube is transversely mounted on the centre position of enclosure interior, described coaxial cable through metal tube and is protruded at the two ends, left and right of housing by waterproof terminal respectively, described metal semicircle tabletting is embedded at metal tube and coaxial cable gap.By the way, the coaxial cable sensor capacity of resisting disturbance of the present invention is strong, advantages of good shielding performance, transmission data stabilization, highly sensitive, resolving power is strong, the suitability is good, good stability, the reflectance of pip is adjustable simultaneously, and also the stability for production efficiency and sensor provides strong guarantee.
Description
Technical field
The present invention relates to all kinds of coaxial cable strain transducer, distributed coax cable strain sensor of a kind of tunable reflectivity and preparation method thereof.
Background technology
At present, sensor plays the most important effect in the life of people, is such as used in the MEMS sensor on the electronic products such as the acceleration transducer on automobile and mobile phone；Equally, have also been obtained for the stress/strain sensor of monitoring object deformation and be widely applied, geological disaster is monitored and early warning.But its technology and product are essentially all area monitoring, the most quasi-distributed monitoring, such as strain ga(u)ge, vibratory string sensing element, Fibre Optical Sensor etc., its monitoring range of these quasi-distributed sensors quality too small, own is easily subject to damage, so having lost monitoring capability before testee is damaged, the monitored over time of structural damage under extreme environment and disaster effect can not be met, can not monitoring comprehensive to whole testee；Therefore, the safety for civil infrastructure is monitored needing wide range, large-length, the sensor of distributed monitoring pattern badly.
Summary of the invention
The technical problem that present invention mainly solves is to provide the distributed coax cable strain sensor of a kind of tunable reflectivity, and made coaxial cable sensor capacity of resisting disturbance is strong, advantages of good shielding performance, transmission data stabilization, highly sensitive, resolving power is strong, the suitability is good, good stability；Filled up the blank utilizing coaxial cable to realize on Fabry-Perot-type cavity sensor technology, its distributed monitoring pattern also overcome current most of strain transducers monitoring during some shortcomings, wide range, large-length and gauge length are variable be also its bright spot in place of.
For solving above-mentioned technical problem, the technical scheme that the present invention uses is: provide the distributed coax cable strain sensor of a kind of tunable reflectivity, including housing, metal tube, metal semicircle tabletting, coaxial cable, waterproof terminal and fixed screw, it is additionally provided with screwed hole on described metal tube, described fixed screw screws in the interior centre position that metal tube is transversely mounted on enclosure interior of screwed hole of metal tube, described coaxial cable through metal tube and is protruded at the two ends, left and right of housing by waterproof terminal respectively, described metal semicircle tabletting is embedded at metal tube and coaxial cable gap.
In a preferred embodiment of the present invention, described coaxial cable uses semi-flexible 50 Ω coaxial cable.
In a preferred embodiment of the present invention, the two ends, left and right of described housing are respectively arranged with U-type groove mouth, and described waterproof terminal is arranged in U-type groove mouth and protrudes from the outside of housing.
In a preferred embodiment of the present invention, described distributed coax cable strain sensor also includes that pip, described pip are placed in the housing being provided with U-type groove mouth.
In a preferred embodiment of the present invention, described metal tube is the cylindrical structure of hollow, and the internal diameter of described metal tube is 5mm, and external diameter is 8mm copper pipe, a length of 15mm.
In a preferred embodiment of the present invention, the internal diameter 1.5mm bigger than the external diameter of coaxial cable of described metal tube.
In a preferred embodiment of the present invention, the material of described metal tube and metal semicircle tabletting all uses pyrite material or aluminium material.
In a preferred embodiment of the present invention, described distributed coax cable strain sensor also includes that outside waterproof terminal fixes nut and the internal fixing nut of waterproof terminal, and described coaxial cable and waterproof terminal are all fixed nut by external stability nut and inside and be fixedly mounted on the two ends, left and right of housing.
In a preferred embodiment of the present invention, described housing carries out embedding by epoxy resin or polyurethane to be fixed.
For solving above-mentioned technical problem, another technical solution used in the present invention is: provide the manufacture method of the distributed coax cable strain sensor of a kind of tunable reflectivity, including step in detail below:
A, foundation require, intercepting internal diameter is 5mm, and external diameter is 8mm, the metal tube of a length of 15mm；
B, cutting length and width, thickness are respectively the copper sheet of 15mm, 10mm, 1.5mm, are fabricated to metal semicircle tabletting；
C, according to make requirement, cutting coaxial cable one；
D, it it is one group by two waterproof terminals and metal tube, sequentially through on coaxial cable；
E, the metal semicircle tabletting made is embedded at metal tube and coaxial cable gap, and metal tube is placed according to the requirement of gauge length；
F, by appropriate screw thread glue point on fixed screw, pre-fix in then being screwed in the screwed hole of metal tube；
G, pre-fixed after, the transducer tip sub-miniature A connector made is connected 50 Ω load；Top sub-miniature A connector is connected on vector network analyzer, and arranges the parameter of vector network analyzer according to test request；
H, rotated clockwise/counterclockwise by tool for twisting screw, regulate the reflectance size of sensor pip one by one, be allowed to meet parameter request；
I, pip adjustment completed, be placed in the U-type groove mouth of fixing housing, and screws waterproof terminal external stability nut and the internal fixing nut of waterproof terminal；
G, complete above-mentioned work after, set level housing, encapsulated epoxy resin or polyurethane on housing.
The invention has the beneficial effects as follows: distributed coax cable strain sensor of the tunable reflectivity of the present invention and preparation method thereof, made coaxial cable sensor capacity of resisting disturbance is strong, advantages of good shielding performance, transmission data stabilization, highly sensitive, resolving power is strong, the suitability is good, good stability；Fill up the blank utilizing coaxial cable to realize on Fabry-Perot-type cavity sensor technology, its distributed monitoring pattern also overcomes the some shortcomings during the monitoring of current most of strain transducers, wide range, large-length and gauge length are variable be also its bright spot in place of, the reflectance of pip is adjustable simultaneously, and also the stability for production efficiency and sensor provides strong guarantee.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, in describing embodiment below, the required accompanying drawing used is briefly described, apparently, accompanying drawing in describing below is only some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings, wherein:
Fig. 1 is the structural representation of a preferred embodiment of the distributed coax cable strain sensor of tunable reflectivity of the present invention；
Fig. 2 is the flow chart of a preferred embodiment of the manufacture method of the distributed coax cable strain sensor of tunable reflectivity of the present invention；
Reference is as follows: 1, housing, and 2, metal tube, 3, metal semicircle tabletting, 4, coaxial cable, 5, waterproof terminal, 6, fixed screw, 7, waterproof terminal external stability nut, 8, the internal fixing nut of waterproof terminal.
Detailed description of the invention
Technical scheme in the embodiment of the present invention will be clearly and completely described below, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, all other embodiments that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of protection of the invention.
As it is shown in figure 1, the embodiment of the present invention includes:
A kind of distributed coax cable strain sensor of tunable reflectivity, including housing 1, metal tube 2, metal semicircle tabletting 3, coaxial cable 4, waterproof terminal 5 and fixed screw 6, the top of described metal tube 2 is additionally provided with screwed hole (figure does not regards), metal tube 2 is transversely mounted on the centre position within housing 1 in screwing in the screwed hole of metal tube 2 by described fixed screw 6, described coaxial cable 4 through metal tube 2 and protrudes the two ends, left and right at housing 1 by waterproof terminal 5 respectively, described metal semicircle tabletting 3 is embedded at metal tube 2 and coaxial cable 4 gap.Wherein, described housing 1 carries out embedding by epoxy resin or polyurethane to be fixed.
Standard coaxial cable 4 of the present invention uses semi-flexible 50 Ω coaxial cable, as common coaxial cable structure, includes inner wire, dielectric layer, outer conductor screen layer and ambroin protection sleeve pipe (PTFE) equally.Inner wire is copper core or ag-plated steel heart yearn.Dielectric layer is also referred to as insulating barrier, and between inner wire and outer conductor screen layer, dielectric layer is in addition to insulating effect, it can also be ensured that inner wire is coaxial with outer conductor screen layer centrage.Outer conductor screen layer is the mesh shields of copper wire establishment, uses tin plating technique processing and fabricating screen layer, outside to protect sleeve pipe for ambroin, and material is with PVC or PTFE.
In above-mentioned, the two ends, left and right of described housing 1 are respectively arranged with U-type groove mouth (figure do not regard), in described waterproof terminal 5 is arranged on U-type groove mouth and protrude from the outside of housing 1；Described distributed coax cable strain sensor also includes pip (figure does not regards), and described pip is placed in U-type groove mouth.
Described metal tube 2 is the cylindrical structure of hollow, and the internal diameter of described metal tube 2 is 5mm, and external diameter is 8mm copper pipe, a length of 15mm.Wherein, the internal diameter 1.5mm bigger than the external diameter of coaxial cable 4 of described metal tube 2, in order to the feasibility that metal sheeting operates in pip device fabrication processes.
Further, described screwed hole uses M5 screw hole, is used for installing fixed screw.Fixed screw uses steel or other high duty metal materials, and wherein, described metal tube 2 and metal semicircle tabletting 3 all use pyrite material, to ensure the stability of machinery in manufacturing process, when installing fixed screw, need to add moderate strength screw thread glue.
Further, described distributed coax cable strain sensor also includes waterproof terminal external stability nut 7 and the internal fixing nut 8 of waterproof terminal, and described coaxial cable 4 and waterproof terminal 5 all fix nut 7 by outside waterproof terminal and the internal nut 8 of fixing of waterproof terminal is fixedly mounted on the two ends, left and right of housing 1.
Housing 1 uses the mode of epoxy resin or encapsulating polyurethane, and waterproof terminal 5 is contained in the both sides of pip in advance, and housing 1 both sides for embedding have U-type groove mouth, in order to waterproof terminal 5 is assigned into.Reflectance size adjusted after pip and waterproof terminal 5 insert in housing 1, screw embedding after the screw of waterproof terminal 5.
As in figure 2 it is shown, the embodiment of the present invention also includes:
A kind of manufacture method of the distributed coax cable strain sensor of tunable reflectivity, including step in detail below:
A, foundation require, intercepting internal diameter is 5mm, and external diameter is 8mm, the metal tube of a length of 15mm；
B, cutting length and width, thickness are respectively the copper sheet of 15mm, 10mm, 1.5mm, are fabricated to metal semicircle tabletting；
C, according to make requirement, cutting coaxial cable one；
D, it it is one group by two waterproof terminals and metal tube, sequentially through on coaxial cable；
E, the metal semicircle tabletting made is embedded at metal tube and coaxial cable gap, and metal tube is placed according to the requirement of gauge length；
F, by appropriate screw thread glue point on fixed screw, pre-fix in then being screwed in the screwed hole of metal tube；
G, pre-fixed after, the transducer tip sub-miniature A connector made is connected 50 Ω load；Top sub-miniature A connector is connected on vector network analyzer, and arranges the parameter of vector network analyzer according to test request；
H, rotated clockwise/counterclockwise by tool for twisting screw, regulate the reflectance size of sensor pip one by one, be allowed to meet parameter request；
I, pip adjustment completed, be placed in the U-type groove mouth of fixing housing, and screws waterproof terminal external stability nut and the internal fixing nut of waterproof terminal；
G, complete above-mentioned work after, set level housing, encapsulated epoxy resin or polyurethane on housing.
The invention reside in coaxial cable sensor and realize distributed computing technology truly, because reflection point position and reflectance size are adjustable, so long transmission distance, gauge length arbitrarily can select between 0.5 meter to 10 meter, successfully solve conventional sensor and can only meet the defect of area monitoring.
It is characteristic of the invention that the reflectance of pip is adjustable, be used for the distance monitoring ensureing microwave signal in coaxial cable, reach the application that distributed coax cable strain Sensor monitoring scope is wide.At pip, the control of reflectance size is considered to destroy the size in various degree of the impedance continuity of coaxial cable.Because microwave signal is during Coaxial Cables, it may appear that a certain degree of decay, thus equal in magnitude for ensureing the reflectance of each pip of distributed sensor.From sensor top to transducer tip, the reflectance of its pip incrementally increases, in manufacturing process, by the top connected vector Network Analyzer of sensor, by the detection of signal, the reflectance of each pip can be adjusted one by one, until it reaches parameter request.So, the distributed coax cable sensor comprising multiple pip just completes.
Its capacity of resisting disturbance of distributed coax cable sensor that the present invention makes is strong, advantages of good shielding performance, transmission data stabilization, it is applicable to high temperature and low temperature environment, its sensitivity, resolution parameter are also superior to other types sensor, in being equipped with the test vowing net, the reflectance of regulating reflection point is adjustable from 0.5% to 6%, meet sensor wide range, large-length, gauge length is adjustable and distance test requirement；Objectively respond that comparison is sensitive and technique is easily achieved, and the making of pip can the multiple spot distribution of property performance period, within its stability can reach 20 standard deviations, show good stability.And the packaging technology of this technology, realize the structure integrally combined of pip and fixing device, more perfectly solve coaxial cable fixation problem in engineer applied, simultaneously, the performance of epoxy resin also can thermal shock experiment in the range of bearing temperature-40 DEG C-+85 DEG C, the injury to pip under high and low temperature state can be avoided, and well serve water-proof function, to avoid the oxidation deactivation of metal tube pip.Certainly, the processing technology of tunable reflectivity size of the present invention can realize the serial or parallel connection of multiple sensor, i.e. sensing detection network, and its Cleaning Principle is identical, is not repeated at this.
It is different from prior art, it is too small that the distributed coax cable sensor of tunable reflectivity size of the present invention not only overcomes moment sensor to there is dynamic range (range), the problems such as adaptability to changes difference, also allow for installing and fix, the technique of sensor production can meet use under adverse circumstances, meeting the use difficult problem under wide range and adverse circumstances, capacity of resisting disturbance is strong, advantages of good shielding performance, transmission data stabilization, highly sensitive, resolving power is strong, the suitability is good, good stability.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure utilizing description of the invention content to be made or equivalence flow process conversion; or directly or indirectly it is used in other relevant technical field, the most in like manner it is included in the scope of patent protection of the present invention.
Claims (10)
1. the distributed coax cable strain sensor of a tunable reflectivity, including housing, metal tube, metal semicircle tabletting, coaxial cable, waterproof terminal and fixed screw, it is additionally provided with screwed hole on described metal tube, described fixed screw screws in the screwed hole of metal tube, described metal tube is transversely mounted on the centre position of enclosure interior, described coaxial cable through metal tube and is protruded at the two ends, left and right of housing by waterproof terminal respectively, and described metal semicircle tabletting is embedded at metal tube and coaxial cable gap.
The distributed coax cable strain sensor of tunable reflectivity the most according to claim 1, it is characterised in that described coaxial cable uses semi-flexible 50 Ω coaxial cable.
The distributed coax cable strain sensor of tunable reflectivity the most according to claim 1, it is characterised in that the two ends, left and right of described housing are respectively arranged with U-type groove mouth, described waterproof terminal is arranged in U-type groove mouth and protrudes from the outside of housing.
The distributed coax cable strain sensor of tunable reflectivity the most according to claim 3, it is characterised in that described distributed coax cable strain sensor also includes that pip, described pip are placed in the housing being provided with U-type groove mouth.
The distributed coax cable strain sensor of tunable reflectivity the most according to claim 1, it is characterised in that described metal tube is the cylindrical structure of hollow, the internal diameter of described metal tube is 5mm, and external diameter is 8mm copper pipe, a length of 15mm.
The distributed coax cable strain sensor of tunable reflectivity the most according to claim 4, it is characterised in that the internal diameter 1.5mm bigger than the external diameter of coaxial cable of described metal tube.
The distributed coax cable strain sensor of tunable reflectivity the most according to claim 1, it is characterised in that the material of described metal tube and metal semicircle tabletting all uses pyrite material or aluminium material.
The distributed coax cable strain sensor of tunable reflectivity the most according to claim 1, it is characterized in that, described distributed coax cable strain sensor also includes that waterproof terminal external stability nut and moisture-proof internal fix nut, and described coaxial cable and waterproof terminal are all fixedly mounted on the two ends, left and right of housing by the internal fixing nut of waterproof terminal external stability nut and waterproof terminal.
The distributed coax cable strain sensor of tunable reflectivity the most according to claim 1, it is characterised in that described housing carries out embedding by epoxy resin or polyurethane to be fixed.
10. according to the manufacture method of the distributed coax cable strain sensor of the tunable reflectivity one of claim 1-9 Suo Shu, it is characterised in that include step in detail below:
A, foundation require, intercepting internal diameter is 5mm, and external diameter is 8mm, the metal tube of a length of 15mm；
B, cutting length and width, thickness are respectively the copper sheet of 15mm, 10mm, 1.5mm, are fabricated to metal semicircle tabletting；
C, according to make requirement, cutting coaxial cable one；
D, it it is one group by two waterproof terminals and metal tube, sequentially through on coaxial cable；
E, the metal semicircle tabletting made is embedded at metal tube and coaxial cable gap, and metal tube is placed according to the requirement of gauge length；
F, by appropriate screw thread glue point on fixed screw, pre-fix in then being screwed in the screwed hole of metal tube；
G, pre-fixed after, the transducer tip sub-miniature A connector made is connected 50 Ω load；Top sub-miniature A connector is connected on vector network analyzer, and arranges the parameter of vector network analyzer according to test request；
H, rotated clockwise/counterclockwise by tool for twisting screw, regulate the reflectance size of sensor pip one by one, be allowed to meet parameter request；
I, pip adjustment completed, be placed in the U-type groove mouth of fixing housing, and screws waterproof terminal external stability nut and the internal fixing nut of waterproof terminal；
G, complete above-mentioned work after, set level housing, encapsulated epoxy resin or polyurethane on housing.
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| CN201510239914.8A CN106152982B (en) | 2015-05-13 | 2015-05-13 | Distributed coax cable strain sensor of tunable reflectivity and preparation method thereof |
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| CN106152982A true CN106152982A (en) | 2016-11-23 |
| CN106152982B CN106152982B (en) | 2018-11-06 |
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| US20060086197A1 (en) * | 2004-10-07 | 2006-04-27 | The Curators Of The University Of Missouri | Strain sensitive coax cable sensors for monitoring structures |
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